Posted inCardiagtech

Decoding Mitsubishi OBD2 Codes: Your Guide to Troubleshooting Engine Issues

No Comments

Encountering a check engine light in your Mitsubishi can be unsettling. Modern vehicles like Mitsubishi cars utilize an On-Board Diagnostic system, specifically OBD2, to monitor various systems and pinpoint potential problems. When an issue arises, your Mitsubishi’s computer generates a diagnostic trouble code (DTC), often referred to as an OBD2 code. Understanding these codes is the first step towards resolving car troubles and ensuring your vehicle runs smoothly.

This comprehensive guide delves into the world of Mitsubishi Obd2 Codes, providing you with a valuable resource to decipher those cryptic messages. While this list isn’t exhaustive and doesn’t replace professional diagnosis, it will equip you with the knowledge to understand common error codes, their potential meanings, and guide your next steps in vehicle maintenance.

Understanding OBD2 Codes for Your Mitsubishi

OBD2 (On-Board Diagnostics II) is a standardized system used in most vehicles manufactured after 1996. It allows mechanics and car owners to access information about the vehicle’s health. When your Mitsubishi’s check engine light illuminates, it signifies that the OBD2 system has detected a problem. An OBD2 scanner can then be connected to your car’s diagnostic port to retrieve the specific trouble code(s).

These codes are typically five characters long, starting with a letter followed by four digits. The first letter indicates the system affected:

  • P: Powertrain (engine, transmission, etc.) – This is the most common category for check engine light codes.
  • B: Body (body control modules, interior, etc.)
  • C: Chassis (braking system, suspension, etc.)
  • U: Network/Communication (communication between onboard computers)

The digits following the letter provide further information about the specific fault. While numerous OBD2 codes exist, many are universal across different manufacturers, including Mitsubishi. However, some codes might be manufacturer-specific, meaning they have a particular meaning for Mitsubishi vehicles.

Common Mitsubishi OBD2 Codes Explained (P0100 – P0434)

Below is a detailed breakdown of common P-series OBD2 codes, frequently encountered in Mitsubishi vehicles. These codes primarily relate to powertrain issues, which are often the cause of a check engine light. Understanding these codes can help you narrow down potential problems and communicate effectively with your mechanic.

P0100 – P0104: Mass or Volume Air Flow (MAF) Sensor Circuit Malfunctions

These codes indicate problems within the Mass Air Flow (MAF) sensor circuit. The MAF sensor measures the amount of air entering the engine, crucial for proper fuel mixture and engine performance.

  • P0100 Mass or Volume Air Flow Circuit Malfunction: General fault in the MAF sensor circuit. Could be wiring, sensor failure, or PCM issue.
  • P0101 Mass or Volume Air Flow Circuit Range/Performance Problem: MAF sensor readings are out of expected range. Could be a dirty sensor, vacuum leak, or sensor malfunction.
  • P0102 Mass or Volume Air Flow Circuit Low Input: MAF sensor signal is lower than expected. Possible causes include a short to ground, wiring issue, or sensor failure.
  • P0103 Mass or Volume Air Flow Circuit High Input: MAF sensor signal is higher than expected. Could be a short to voltage, wiring issue, or sensor failure.
  • P0104 Mass or Volume Air Flow Circuit Intermittent: Intermittent signal fluctuations from the MAF sensor. Often caused by loose wiring or a failing sensor.

Symptoms of MAF Sensor Issues:

  • Check Engine Light
  • Rough idling or stalling
  • Poor acceleration
  • Reduced fuel economy
  • Engine misfires

P0105 – P0109: Manifold Absolute Pressure (MAP)/Barometric Pressure Circuit Malfunctions

These codes relate to the Manifold Absolute Pressure (MAP) sensor, which measures the pressure inside the intake manifold. This information is vital for the engine control unit (ECU) to calculate air density and adjust fuel delivery.

  • P0105 Manifold Absolute Pressure/Barometric Pressure Circuit Malfunction: General fault in the MAP/Barometric Pressure circuit.
  • P0106 Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance Problem: MAP sensor readings are inconsistent or outside the acceptable range.
  • P0107 Manifold Absolute Pressure/Barometric Pressure Circuit Low Input: Low voltage signal from the MAP sensor.
  • P0108 Manifold Absolute Pressure/Barometric Pressure Circuit High Input: High voltage signal from the MAP sensor.
  • P0109 Manifold Absolute Pressure/Barometric Pressure Circuit Intermittent: Intermittent signal issues from the MAP sensor.

Symptoms of MAP Sensor Issues:

  • Check Engine Light
  • Poor fuel economy
  • Hesitation or stalling
  • Engine misfires
  • Failed emissions test

P0110 – P0114: Intake Air Temperature (IAT) Sensor Circuit Malfunctions

The Intake Air Temperature (IAT) sensor measures the temperature of the air entering the engine. This data is used by the ECU to adjust fuel delivery and ignition timing for optimal performance and emissions.

  • P0109 Intake Air Temperature Circuit Malfunction: (Note: Code number should likely be P0110) General fault in the IAT sensor circuit.
  • P0111 Intake Air Temperature Circuit Range/Performance Problem: IAT sensor readings are illogical or outside the expected range.
  • P0112 Intake Air Temperature Circuit Low Input: Low voltage signal from the IAT sensor, indicating a low temperature reading when it might not be accurate.
  • P0113 Intake Air Temperature Circuit High Input: High voltage signal from the IAT sensor, suggesting a high temperature reading that could be false.
  • P0114 Intake Air Temperature Circuit Intermittent: Intermittent or unstable signal from the IAT sensor.

Symptoms of IAT Sensor Issues:

  • Check Engine Light
  • Poor fuel economy
  • Engine performance issues (especially in varying temperatures)
  • Difficulty starting

P0115 – P0119: Engine Coolant Temperature (ECT) Sensor Circuit Malfunctions

The Engine Coolant Temperature (ECT) sensor measures the temperature of the engine coolant. This is crucial for the ECU to manage engine temperature, control cooling fans, and adjust fuel and ignition for cold starts and warm-up phases.

  • P0115 Engine Coolant Temperature Circuit Malfunction: General problem with the ECT sensor circuit.
  • P0116 Engine Coolant Temperature Circuit Range/Performance Problem: ECT sensor readings are inconsistent or outside the normal operating range.
  • P0117 Engine Coolant Temperature Circuit Low Input: Low voltage signal from the ECT sensor, indicating a low coolant temperature, possibly falsely.
  • P0118 Engine Coolant Temperature Circuit High Input: High voltage signal from the ECT sensor, indicating a high coolant temperature, possibly falsely.
  • P0119 Engine Coolant Temperature Circuit Intermittent: Erratic or unstable signal from the ECT sensor.

Symptoms of ECT Sensor Issues:

  • Check Engine Light
  • Engine overheating or not reaching operating temperature
  • Poor fuel economy
  • Cooling fans running constantly or not at all
  • Rough idling or stalling
  • Difficulty starting, especially when cold

P0120 – P0124: Throttle/Pedal Position Sensor/Switch A Circuit Malfunctions

These codes point to issues within the Throttle Position Sensor (TPS) circuit. The TPS monitors the position of the throttle plate, providing the ECU with information about driver demand and load.

  • P0120 Throttle/Petal Position Sensor/Switch A Circuit Malfunction: General fault in the TPS circuit.
  • P0121 Throttle/Petal Position Sensor/Switch A Circuit Range/Performance Problem: TPS signal doesn’t correlate correctly with throttle position or other sensor inputs.
  • P0122 Throttle/Petal Position Sensor/Switch A Circuit Low Input: Low voltage signal from the TPS, indicating a closed throttle position when it might not be.
  • P0123 Throttle/Petal Position Sensor/Switch A Circuit High Input: High voltage signal from the TPS, indicating an open throttle position when it might not be.
  • P0124 Throttle/Petal Position Sensor/Switch A Circuit Intermittent: Intermittent or fluctuating signal from the TPS.

Symptoms of TPS Issues:

  • Check Engine Light
  • Poor acceleration or hesitation
  • Unpredictable idling (high or low)
  • Transmission shifting problems
  • Engine stalling

P0125 – P0126: Insufficient Coolant Temperature for Fuel Control

These codes are related to the engine not reaching the required coolant temperature for closed-loop fuel control or stable operation.

  • P0125 Insufficient Coolant Temperature for Closed Loop Fuel Control: The engine coolant is not reaching the minimum temperature required for the system to switch to closed-loop fuel control, which is more efficient and cleaner.
  • P0126 Insufficient Coolant Temperature for Stable Operation: Engine coolant temperature is too low for stable and efficient engine operation.

Possible Causes for P0125/P0126:

  • Faulty thermostat (stuck open)
  • Faulty ECT sensor (reporting incorrect temperature)
  • Cooling system issues
  • Driving conditions (very short trips in cold weather)

Symptoms of P0125/P0126:

  • Check Engine Light
  • Poor fuel economy
  • Engine running rich (excess fuel)
  • Reduced engine performance

P0130 – P0167: Oxygen (O2) Sensor Circuit Malfunctions (Bank 1 & Bank 2, Sensor 1, 2, & 3)

These extensive code ranges cover malfunctions within the oxygen (O2) sensor circuits. O2 sensors are critical for monitoring the oxygen content in the exhaust gas. This information is used by the ECU to fine-tune the air-fuel mixture for optimal combustion and emissions control. “Bank 1” refers to the cylinder bank that contains cylinder #1, and “Bank 2” is the opposite bank (if applicable in V-engines). “Sensor 1” is usually upstream of the catalytic converter, “Sensor 2” is downstream, and “Sensor 3” (less common) is further downstream.

  • P0130 – P0135: Bank 1 Sensor 1 O2 Sensor Circuit Issues: Relate to the upstream O2 sensor on Bank 1.
  • P0136 – P0141: Bank 1 Sensor 2 O2 Sensor Circuit Issues: Relate to the downstream O2 sensor on Bank 1.
  • P0142 – P0147: Bank 1 Sensor 3 O2 Sensor Circuit Issues: Relate to a third O2 sensor on Bank 1 (if equipped).
  • P0150 – P0155: Bank 2 Sensor 1 O2 Sensor Circuit Issues: Relate to the upstream O2 sensor on Bank 2.
  • P0156 – P0161: Bank 2 Sensor 2 O2 Sensor Circuit Issues: Relate to the downstream O2 sensor on Bank 2.
  • P0162 – P0167: Bank 2 Sensor 3 O2 Sensor Circuit Issues: Relate to a third O2 sensor on Bank 2 (if equipped).

Common O2 Sensor Code Categories:

  • … Circuit Malfunction: General circuit fault, wiring, sensor, or PCM.
  • … Circuit Low Voltage: Sensor signal voltage is too low.
  • … Circuit High Voltage: Sensor signal voltage is too high.
  • … Circuit Slow Response: Sensor is not reacting quickly enough to changes in exhaust gas composition.
  • … Circuit No Activity Detected: Sensor is not providing any signal.
  • … Heater Circuit Malfunction: The heater element within the O2 sensor (to bring it up to operating temperature quickly) is faulty.

Symptoms of O2 Sensor Issues:

  • Check Engine Light
  • Poor fuel economy
  • Failed emissions test
  • Rough idling
  • Hesitation or reduced power
  • Engine misfires

P0170 – P0175: Fuel Trim Malfunctions (Bank 1 & Bank 2)

Fuel trim refers to the adjustments the ECU makes to the base fuel delivery rate to maintain the optimal air-fuel ratio. These codes indicate issues with the fuel trim system, suggesting the engine is running too lean (too much air, not enough fuel) or too rich (too much fuel, not enough air).

  • P0170 Fuel Trim Malfunction (Bank 1): General fuel trim issue on Bank 1.
  • P0171 System too Lean (Bank 1): Engine is running lean on Bank 1.
  • P0172 System too Rich (Bank 1): Engine is running rich on Bank 1.
  • P0173 Fuel Trim Malfunction (Bank 2): General fuel trim issue on Bank 2.
  • P0174 System too Lean (Bank 2): Engine is running lean on Bank 2.
  • P0175 System too Rich (Bank 2): Engine is running rich on Bank 2.

Possible Causes for Lean Conditions (P0171, P0174):

  • Vacuum leaks
  • MAF sensor issues (underreporting air)
  • Fuel delivery problems (weak fuel pump, clogged fuel filter, injector issues)
  • Exhaust leaks upstream of O2 sensors

Possible Causes for Rich Conditions (P0172, P0175):

  • Faulty O2 sensors (incorrect readings)
  • Fuel pressure regulator issues (high fuel pressure)
  • Injector leaks
  • MAF sensor issues (overreporting air)
  • Restricted air filter

Symptoms of Fuel Trim Issues:

  • Check Engine Light
  • Poor fuel economy
  • Rough idling
  • Hesitation or stalling
  • Engine misfires
  • Failed emissions test
  • Black smoke from exhaust (rich condition)

P0176 – P0179: Fuel Composition Sensor Circuit Malfunctions

These codes are related to the Fuel Composition Sensor, which measures the ethanol content in the fuel (primarily in flex-fuel vehicles).

  • P0176 Fuel Composition Sensor Circuit Malfunction: General fault in the fuel composition sensor circuit.
  • P0177 Fuel Composition Sensor Circuit Range/Performance: Sensor readings are out of range or illogical.
  • P0178 Fuel Composition Sensor Circuit Low Input: Low voltage signal from the sensor.
  • P0179 Fuel Composition Sensor Circuit High Input: High voltage signal from the sensor.

Symptoms of Fuel Composition Sensor Issues:

  • Check Engine Light
  • Poor fuel economy (especially in flex-fuel vehicles)
  • Engine performance problems
  • Difficulty starting
  • Incorrect fuel mixture calculation

P0180 – P0189: Fuel Temperature Sensor Circuit Malfunctions

These codes pertain to the Fuel Temperature Sensor, which measures the temperature of the fuel. This information can be used by the ECU for fuel delivery calculations and to prevent vapor lock in hot weather.

  • P0180 Fuel Temperature Sensor A Circuit Malfunction: General fault in the Fuel Temperature Sensor A circuit.
  • P0181 Fuel Temperature Sensor A Circuit Range/Performance: Sensor readings are inconsistent or outside the expected range.
  • P0182 Fuel Temperature Sensor A Circuit Low Input: Low voltage signal from Fuel Temperature Sensor A.
  • P0183 Fuel Temperature Sensor A Circuit High Input: High voltage signal from Fuel Temperature Sensor A.
  • P0184 Fuel Temperature Sensor A Circuit Intermittent: Intermittent signal issues from Fuel Temperature Sensor A.
  • P0185 – P0189: Similar codes for Fuel Temperature Sensor B (if equipped).

Symptoms of Fuel Temperature Sensor Issues:

  • Check Engine Light
  • Poor fuel economy
  • Engine performance issues, especially in hot weather
  • Difficulty starting or vapor lock symptoms

P0190 – P0194: Fuel Rail Pressure Sensor Circuit Malfunctions

The Fuel Rail Pressure Sensor monitors the pressure of the fuel in the fuel rail. This is critical for proper fuel injection and engine performance.

  • P0190 Fuel Rail Pressure Sensor Circuit Malfunction: General fault in the Fuel Rail Pressure Sensor circuit.
  • P0191 Fuel Rail Pressure Sensor Circuit Range/Performance: Sensor readings are out of the expected range or inconsistent.
  • P0192 Fuel Rail Pressure Sensor Circuit Low Input: Low voltage signal from the Fuel Rail Pressure Sensor, indicating low fuel pressure.
  • P0193 Fuel Rail Pressure Sensor Circuit High Input: High voltage signal from the Fuel Rail Pressure Sensor, indicating high fuel pressure.
  • P0194 Fuel Rail Pressure Sensor Circuit Intermittent: Intermittent signal issues from the Fuel Rail Pressure Sensor.

Symptoms of Fuel Rail Pressure Sensor Issues:

  • Check Engine Light
  • Engine misfires or hesitation
  • Stalling
  • Difficulty starting
  • Poor fuel economy
  • Reduced engine power

P0195 – P0199: Engine Oil Temperature Sensor Malfunctions

These codes are related to the Engine Oil Temperature Sensor, which monitors the temperature of the engine oil. This information can be used for various purposes, including oil life monitoring systems and engine protection strategies.

  • P0195 Engine Oil Temperature Sensor Malfunction: General fault in the Engine Oil Temperature Sensor circuit.
  • P0196 Engine Oil Temperature Sensor Range/Performance: Sensor readings are illogical or outside the normal range.
  • P0197 Engine Oil Temperature Sensor Low: Low temperature reading from the sensor, potentially inaccurate.
  • P0198 Engine Oil Temperature Sensor High: High temperature reading from the sensor, potentially inaccurate.
  • P0199 Engine Oil Temperature Sensor Intermittent: Intermittent or unstable signal from the sensor.

Symptoms of Engine Oil Temperature Sensor Issues:

  • Check Engine Light
  • Oil life monitoring system malfunctions
  • Potential engine performance issues (if ECU uses this data for engine management)
  • Inaccurate oil temperature gauge readings

P0200 – P0214: Injector Circuit Malfunctions (General & Cylinder Specific)

These codes indicate problems within the fuel injector circuits. Fuel injectors are responsible for precisely delivering fuel into the engine cylinders.

  • P0200 Injector Circuit Malfunction: General fault in the injector circuit, affecting multiple or all injectors.
  • P0201 – P0212: Injector Circuit Malfunction – Cylinder 1 through 12: Specific injector circuit malfunction for the designated cylinder.
  • P0213 Cold Start Injector 1 Malfunction: Fault in the cold start injector circuit (if equipped).
  • P0214 Cold Start Injector 2 Malfunction: Fault in a second cold start injector circuit (if equipped).

Symptoms of Injector Circuit Issues:

  • Check Engine Light
  • Engine misfires
  • Rough idling
  • Poor acceleration
  • Reduced fuel economy
  • Fuel smell
  • Engine knocking or pinging

P0215 Engine Shutoff Solenoid Malfunction

This code indicates a problem with the engine shutoff solenoid circuit. This solenoid is typically used in diesel engines to control fuel supply and shut down the engine.

Symptoms of Engine Shutoff Solenoid Issues:

  • Check Engine Light
  • Engine may not start or shut off properly
  • Engine stalling

P0216 Injection Timing Control Circuit Malfunction

This code suggests a problem with the injection timing control circuit, primarily relevant to diesel engines with electronically controlled injection timing.

Symptoms of Injection Timing Control Issues:

  • Check Engine Light
  • Poor engine performance
  • Reduced fuel economy
  • Excessive smoke
  • Engine knocking or pinging

P0217 Engine Overtemp Condition

This code indicates that the engine has overheated.

Possible Causes for Engine Overtemp:

  • Cooling system leaks
  • Faulty thermostat (stuck closed)
  • Water pump failure
  • Cooling fan malfunction
  • Low coolant level

Symptoms of Engine Overtemp:

  • Check Engine Light
  • Temperature gauge reading high
  • Steam or coolant leak
  • Engine knocking or unusual noises

P0218 Transmission Over Temperature Condition

This code indicates that the transmission fluid temperature is too high.

Possible Causes for Transmission Overtemp:

  • Heavy towing or hauling
  • Low transmission fluid level
  • Transmission cooler issues
  • Strenuous driving conditions

Symptoms of Transmission Overtemp:

  • Check Engine Light
  • Transmission shifting problems
  • Transmission fluid leaks
  • Unusual transmission noises or slipping

P0219 Engine Overspeed Condition

This code indicates that the engine RPM (revolutions per minute) has exceeded the safe limit.

Possible Causes for Engine Overspeed:

  • Downshifting at high speed
  • Mechanical failure
  • Driver error

Symptoms of Engine Overspeed:

  • Check Engine Light
  • Engine running at excessively high RPM
  • Potential engine damage

P0220 – P0229: Throttle/Pedal Position Sensor/Switch B & C Circuit Malfunctions

These codes are similar to P0120-P0124 but relate to additional throttle position sensors (if equipped). Some vehicles have multiple TPS sensors for redundancy or advanced throttle control systems.

  • P0220 – P0224: Throttle/Petal Position Sensor/Switch B Circuit Malfunctions: Issues with Throttle Position Sensor B circuit.
  • P0225 – P0229: Throttle/Petal Position Sensor/Switch C Circuit Malfunctions: Issues with Throttle Position Sensor C circuit.

Symptoms are similar to P0120-P0124 (TPS Sensor A issues).

P0230 – P0233: Fuel Pump Primary/Secondary Circuit Malfunctions

These codes indicate problems within the fuel pump circuit. The fuel pump is responsible for delivering fuel from the fuel tank to the engine.

  • P0230 Fuel Pump Primary Circuit Malfunction: Fault in the primary control circuit for the fuel pump relay or fuel pump itself.
  • P0231 Fuel Pump Secondary Circuit Low: Low voltage in the secondary circuit (power supply) to the fuel pump.
  • P0232 Fuel Pump Secondary Circuit High: High voltage in the secondary circuit to the fuel pump.
  • P0233 Fuel Pump Secondary Circuit Intermittent: Intermittent issues in the secondary circuit to the fuel pump.

Symptoms of Fuel Pump Circuit Issues:

  • Check Engine Light
  • Engine not starting or hard starting
  • Engine stalling
  • Fuel delivery problems
  • Weak fuel pressure

P0234 Engine Overboost Condition

This code indicates that the turbocharger (if equipped) is producing excessive boost pressure.

Possible Causes for Overboost:

  • Faulty boost pressure sensor
  • Wastegate malfunction
  • Boost control solenoid issues
  • Mechanical problems with the turbocharger system

Symptoms of Overboost:

  • Check Engine Light
  • Reduced engine performance (ECU may limit power to protect engine)
  • Potential engine damage

P0235 – P0238: Turbocharger Boost Sensor A Circuit Malfunctions

These codes relate to the Turbocharger Boost Sensor A circuit, which measures the boost pressure produced by the turbocharger.

  • P0235 Turbocharger Boost Sensor A Circuit Malfunction: General fault in the Boost Sensor A circuit.
  • P0236 Turbocharger Boost Sensor A Circuit Range/Performance: Sensor readings are out of range or inconsistent.
  • P0237 Turbocharger Boost Sensor A Circuit Low: Low voltage signal from Boost Sensor A.
  • P0238 Turbocharger Boost Sensor A Circuit High: High voltage signal from Boost Sensor A.

Symptoms of Boost Sensor Issues:

  • Check Engine Light
  • Reduced engine performance (turbo boost issues)
  • Poor fuel economy
  • Engine hesitation

P0239 – P0242: Turbocharger Boost Sensor B Circuit Malfunctions

Similar to P0235-P0238, but for Turbocharger Boost Sensor B (if equipped with multiple boost sensors).

P0243 – P0250: Turbocharger Wastegate Solenoid Circuit Malfunctions

These codes indicate problems within the Turbocharger Wastegate Solenoid circuit. The wastegate solenoid controls the wastegate, which regulates turbo boost pressure.

  • P0243 Turbocharger Wastegate Solenoid A Malfunction: General fault in Wastegate Solenoid A circuit.
  • P0244 Turbocharger Wastegate Solenoid A Range/Performance: Solenoid operation is not as expected.
  • P0245 Turbocharger Wastegate Solenoid A Low: Low voltage to Wastegate Solenoid A.
  • P0246 Turbocharger Wastegate Solenoid A High: High voltage to Wastegate Solenoid A.
  • P0247 – P0250: Similar codes for Turbocharger Wastegate Solenoid B (if equipped).

Symptoms of Wastegate Solenoid Issues:

  • Check Engine Light
  • Overboost or underboost conditions
  • Reduced engine performance
  • Turbocharger problems

P0251 – P0260: Injection Pump Fuel Metering Control “A” & “B” Malfunctions

These codes are typically found in diesel engines and relate to the fuel metering control systems within the injection pump.

  • P0251 – P0255: Injection Pump Fuel Metering Control “A” Malfunction: Issues with Fuel Metering Control “A” (often related to cam/rotor/injector feedback).
  • P0256 – P0260: Injection Pump Fuel Metering Control “B” Malfunction: Issues with Fuel Metering Control “B”.

Symptoms of Injection Pump Fuel Metering Issues:

  • Check Engine Light
  • Poor engine performance
  • Reduced fuel economy
  • Hard starting or no starting
  • Excessive smoke
  • Engine knocking or misfires

P0261 – P0296: Cylinder Injector Circuit Low/High & Contribution/Balance Faults (Cylinder Specific)

These codes cover a range of injector-related faults, both circuit issues and cylinder contribution/balance problems.

  • P0261, P0264, P0267, P0270, P0273, P0276, P0279, P0282, P0285, P0288, P0291, P0294: Cylinder Injector Circuit Low (Cylinders 1-12): Low voltage to the injector circuit for the specified cylinder.
  • P0262, P0265, P0268, P0271, P0274, P0277, P0280, P0283, P0286, P0289, P0292, P0295: Cylinder Injector Circuit High (Cylinders 1-12): High voltage to the injector circuit for the specified cylinder.
  • P0263, P0266, P0269, P0272, P0275, P0278, P0281, P0284, P0287, P0290, P0293, P0296: Cylinder Contribution/Balance Fault (Cylinders 1-12): Indicates an imbalance in the fuel contribution or power output from the specified cylinder compared to others.

Symptoms of Cylinder Injector Issues:

  • Check Engine Light
  • Engine misfires (specific cylinder or random)
  • Rough idling
  • Poor acceleration
  • Reduced power
  • Fuel smell
  • Engine knocking

P0300 – P0312: Misfire Detected (Random/Multiple & Cylinder Specific)

These are common misfire codes, indicating that the engine is not firing correctly in one or more cylinders.

  • P0300 Random/Multiple Cylinder Misfire Detected: Misfires are occurring in multiple cylinders or randomly, and the system cannot pinpoint a specific cylinder.
  • P0301 – P0312: Cylinder 1 through 12 Misfire Detected: Misfire is specifically detected in the designated cylinder. (Note: P0309, P0311, P0312 are also listed in the original text, implying up to 12 cylinders).

Possible Causes for Misfires:

  • Spark plug issues (fouled, worn, incorrect gap)
  • Ignition coil problems (faulty coil)
  • Ignition wire issues (damaged, worn)
  • Fuel injector problems (clogged, faulty)
  • Vacuum leaks
  • Low compression
  • Timing issues
  • Sensor problems (crankshaft, camshaft)

Symptoms of Misfires:

  • Check Engine Light (often flashing if severe)
  • Rough idling
  • Engine shaking or vibration
  • Poor acceleration
  • Reduced power
  • Increased fuel consumption
  • Failed emissions test

P0320 – P0323: Ignition/Distributor Engine Speed Input Circuit Malfunctions

These codes relate to the engine speed input circuit, which is crucial for ignition and fuel timing. In older vehicles, this might be related to the distributor, while in modern cars, it’s linked to crankshaft/camshaft position sensors.

  • P0320 Ignition/Distributor Engine Speed Input Circuit Malfunction: General fault in the engine speed input circuit.
  • P0321 Ignition/Distributor Engine Speed Input Circuit Range/Performance: Signal is out of range or inconsistent.
  • P0322 Ignition/Distributor Engine Speed Input Circuit No Signal: No signal from the engine speed sensor.
  • P0323 Ignition/Distributor Engine Speed Input Circuit Intermittent: Intermittent signal issues.

Symptoms of Engine Speed Input Circuit Issues:

  • Check Engine Light
  • Engine not starting or hard starting
  • Engine stalling
  • Misfires
  • Poor engine performance

P0325 – P0329: Knock Sensor 1 Circuit Malfunctions (Bank 1 or Single Sensor)

These codes relate to the Knock Sensor 1 circuit. Knock sensors detect engine knocking or detonation, allowing the ECU to retard ignition timing to protect the engine.

  • P0325 Knock Sensor 1 Circuit Malfunction (Bank 1 or Single Sensor): General fault in Knock Sensor 1 circuit.
  • P0326 Knock Sensor 1 Circuit Range/Performance (Bank 1 or Single Sensor): Sensor readings are out of range or illogical.
  • P0327 Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor): Low voltage signal from Knock Sensor 1.
  • P0328 Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor): High voltage signal from Knock Sensor 1.
  • P0329 Knock Sensor 1 Circuit Intermittent (Bank 1 or Single Sensor): Intermittent signal issues.

Symptoms of Knock Sensor Issues:

  • Check Engine Light
  • Reduced engine performance (ECU may retard timing excessively)
  • Engine pinging or knocking noises (potentially, but the sensor is supposed to prevent this)
  • Poor fuel economy

P0330 – P0334: Knock Sensor 2 Circuit Malfunctions (Bank 2)

Similar to P0325-P0329, but for Knock Sensor 2 (on Bank 2, if equipped).

P0335 – P0339: Crankshaft Position Sensor A Circuit Malfunctions

The Crankshaft Position Sensor (CKP) is critical for determining engine RPM and crankshaft position. This information is essential for ignition and fuel injection timing.

  • P0335 Crankshaft Position Sensor A Circuit Malfunction: General fault in CKP Sensor A circuit.
  • P0336 Crankshaft Position Sensor A Circuit Range/Performance: Sensor readings are out of range or inconsistent.
  • P0337 Crankshaft Position Sensor A Circuit Low Input: Low voltage signal from CKP Sensor A.
  • P0338 Crankshaft Position Sensor A Circuit High Input: High voltage signal from CKP Sensor A.
  • P0339 Crankshaft Position Sensor A Circuit Intermittent: Intermittent signal issues.

Symptoms of Crankshaft Position Sensor Issues:

  • Check Engine Light
  • Engine not starting or hard starting
  • Engine stalling
  • Misfires
  • Poor engine performance

P0340 – P0344: Camshaft Position Sensor Circuit Malfunctions

The Camshaft Position Sensor (CMP) provides information about camshaft position, which is used in conjunction with the CKP sensor for precise engine control.

  • P0340 Camshaft Position Sensor Circuit Malfunction: General fault in CMP Sensor circuit.
  • P0341 Camshaft Position Sensor Circuit Range/Performance: Sensor readings are out of range or inconsistent.
  • P0342 Camshaft Position Sensor Circuit Low Input: Low voltage signal from CMP Sensor.
  • P0343 Camshaft Position Sensor Circuit High Input: High voltage signal from CMP Sensor.
  • P0344 Camshaft Position Sensor Circuit Intermittent: Intermittent signal issues.

Symptoms of Camshaft Position Sensor Issues:

  • Check Engine Light
  • Engine not starting or hard starting
  • Engine stalling
  • Misfires
  • Poor engine performance
  • Loss of synchronization between crankshaft and camshaft

P0350 – P0362: Ignition Coil Primary/Secondary Circuit Malfunctions (General & Coil Specific)

These codes relate to the ignition coil circuits. Ignition coils are responsible for providing the high voltage spark to the spark plugs to ignite the air-fuel mixture.

  • P0350 Ignition Coil Primary/Secondary Circuit Malfunction: General fault in the ignition coil circuit.
  • P0351 – P0362: Ignition Coil A through L Primary/Secondary Circuit Malfunction: Specific ignition coil circuit malfunction for the designated coil (A, B, C, etc., often corresponding to cylinders).

Symptoms of Ignition Coil Issues:

  • Check Engine Light
  • Engine misfires (often cylinder-specific)
  • Rough idling
  • Poor acceleration
  • Reduced power
  • Engine shaking or vibration

P0370 – P0379: Timing Reference High Resolution Signal A & B Malfunctions

These codes are less common in typical OBD2 troubleshooting and relate to more complex timing reference signals, potentially used in specific engine control systems.

  • P0370 – P0374: Timing Reference High Resolution Signal A Malfunction: Issues with Timing Reference Signal A (various types of faults like malfunction, too many pulses, too few pulses, intermittent, no pulses).
  • P0375 – P0379: Timing Reference High Resolution Signal B Malfunction: Issues with Timing Reference Signal B.

Symptoms of Timing Reference Signal Issues:

  • Check Engine Light
  • Engine performance problems
  • Starting issues
  • Misfires

P0380 – P0382: Glow Plug/Heater Circuit & Exhaust Gas Recirculation Flow Malfunctions

  • P0380 Glow Plug/Heater Circuit “A” Malfunction: Fault in the glow plug or heater circuit (primarily for diesel engines, glow plugs aid in cold starting).
  • P0381 Glow Plug/Heater Indicator Circuit Malfunction: Problem with the indicator light circuit for the glow plugs.
  • P0382 Exhaust Gas Recirculation Flow Malfunction: General fault in the Exhaust Gas Recirculation (EGR) system.

Symptoms of Glow Plug Issues (Diesel):

  • Check Engine Light
  • Hard starting in cold weather
  • Excessive white smoke on startup (diesel)

Symptoms of EGR System Issues:

  • Check Engine Light
  • Poor fuel economy
  • Rough idling
  • Failed emissions test
  • Engine performance problems

P0385 – P0389: Crankshaft Position Sensor B Circuit Malfunctions

Similar to P0335-P0339, but for Crankshaft Position Sensor B (if equipped with dual CKP sensors, often for redundancy or more precise control).

P0400 – P0409: Exhaust Gas Recirculation (EGR) Flow & Sensor Circuit Malfunctions

These codes are related to the Exhaust Gas Recirculation (EGR) system. The EGR system recirculates a portion of exhaust gas back into the intake manifold to reduce NOx emissions.

  • P0400 Exhaust Gas Recirculation Flow Malfunction: General EGR flow problem.
  • P0401 Exhaust Gas Recirculation Flow Insufficient Detected: Insufficient EGR flow.
  • P0402 Exhaust Gas Recirculation Flow Excessive Detected: Excessive EGR flow.
  • P0403 Exhaust Gas Recirculation Circuit Malfunction: Fault in the EGR valve control circuit.
  • P0404 Exhaust Gas Recirculation Circuit Range/Performance: EGR valve operation is not as expected.
  • P0405 Exhaust Gas Recirculation Sensor A Circuit Low: Low voltage from EGR Sensor A.
  • P0406 Exhaust Gas Recirculation Sensor A Circuit High: High voltage from EGR Sensor A.
  • P0407 Exhaust Gas Recirculation Sensor B Circuit Low: Low voltage from EGR Sensor B.
  • P0408 Exhaust Gas Recirculation Sensor B Circuit High: High voltage from EGR Sensor B.

Symptoms of EGR System Issues:

  • Check Engine Light
  • Poor fuel economy
  • Rough idling
  • Stalling
  • Failed emissions test
  • Engine performance problems

P0410 – P0419: Secondary Air Injection System Malfunctions

The Secondary Air Injection (SAI) system pumps fresh air into the exhaust system during cold starts to help the catalytic converter reach operating temperature quickly and reduce emissions.

  • P0410 Secondary Air Injection System Malfunction: General fault in the SAI system.
  • P0411 Secondary Air Injection System Incorrect Flow Detected: Incorrect SAI flow.
  • P0412 – P0414: Secondary Air Injection System Switching Valve A Circuit Malfunctions: Issues with Switching Valve A circuit (malfunction, open circuit, shorted circuit).
  • P0415 – P0417: Secondary Air Injection System Switching Valve B Circuit Malfunctions: Issues with Switching Valve B circuit.
  • P0418 Secondary Air Injection System Relay “A” Circuit Malfunction: Fault in Relay “A” circuit.
  • P0419 Secondary Air Injection System Relay “B” Circuit Malfunction: Fault in Relay “B” circuit.

Symptoms of SAI System Issues:

  • Check Engine Light
  • Failed emissions test
  • Unusual noises during cold starts (SAI pump noise)

P0420 – P0434: Catalyst System Efficiency Below Threshold (Bank 1 & Bank 2)

These codes indicate that the catalytic converter efficiency is below the required threshold. The catalytic converter is responsible for reducing harmful emissions from the exhaust.

  • P0420 Catalyst System Efficiency Below Threshold (Bank 1): Catalytic converter on Bank 1 is not working efficiently.
  • P0421 Warm Up Catalyst Efficiency Below Threshold (Bank 1): Warm-up catalytic converter (if equipped) on Bank 1 is not efficient.
  • P0422 Main Catalyst Efficiency Below Threshold (Bank 1): Main catalytic converter on Bank 1 is inefficient.
  • P0423 Heated Catalyst Efficiency Below Threshold (Bank 1): Heated catalytic converter (if equipped) on Bank 1 is inefficient.
  • P0424 Heated Catalyst Temperature Below Threshold (Bank 1): Heated catalytic converter temperature is too low on Bank 1.
  • P0430 – P0434: Similar codes for Catalyst System Efficiency Below Threshold on Bank 2.

Possible Causes for Catalytic Converter Efficiency Issues:

  • Faulty catalytic converter (aged, damaged)
  • Exhaust leaks
  • O2 sensor issues (incorrect readings)
  • Engine running rich or lean for extended periods
  • Engine misfires

Symptoms of Catalytic Converter Issues:

  • Check Engine Light
  • Failed emissions test
  • Poor fuel economy
  • Reduced engine performance
  • Rattling noises from the exhaust system

Conclusion

This guide provides a detailed overview of common Mitsubishi OBD2 codes, specifically focusing on the P0100 to P0434 range. While this information is valuable for understanding potential issues with your Mitsubishi, it’s crucial to remember that OBD2 codes are diagnostic aids, not definitive diagnoses.

If your check engine light is illuminated and you retrieve an OBD2 code, use this guide as a starting point. However, proper diagnosis often requires further investigation, including professional scanning tools, sensor testing, and mechanical inspections.

For accurate diagnosis and repair, always consult a qualified mechanic. They possess the expertise and equipment to pinpoint the root cause of the problem and ensure your Mitsubishi is running optimally and reliably. This knowledge empowers you to communicate effectively with your mechanic and make informed decisions about your vehicle’s maintenance.

Comments

No comments yet. Why don’t you start the discussion?

Leave a Reply

Your email address will not be published. Required fields are marked *