Navigating car trouble can be frustrating, but understanding your GM vehicle’s OBD2 system is the first step to a solution. This guide provides an extensive Gm Obd2 Codes List, specifically for General Motors vehicles manufactured from 1996 onwards. This includes a wide range of brands like GMC, Chevrolet, Buick, Cadillac, and even older brands such as Oldsmobile, Pontiac, and Saturn.
While this list is broadly applicable, remember that slight variations can exist depending on your specific vehicle’s year and model. Always consult your vehicle’s factory service manual for the most precise information.
GM vehicles primarily utilize the SAE J1850 VPW (Variable Pulse Width Modulation) communication protocol. However, it’s worth noting some exceptions, like the Cadillac Catera (a German Opel derivative), which uses the European ISO 9141 protocol. For the vast majority of GM vehicles in the US market, this list will be highly relevant.
Understanding GM Specific OBD2 Powertrain Diagnostic Trouble Codes
This section focuses on GM specific powertrain diagnostic trouble codes. These codes are crucial for diagnosing issues related to your engine and transmission. They go beyond the generic OBD2 codes (P0XXX) and provide more detailed insights into potential problems within your GM vehicle.
[It’s beneficial to understand how to use an OBD2 scanner to retrieve these codes. This list becomes most valuable when you have a code in hand and need to decipher its meaning.]
Below is a detailed GM OBD2 codes list, starting with P1XXX codes, offering descriptions to help you understand potential issues.
| DTC | Description |
|---|---|
| P1031 | HO2S Heater Current Monitor Control Circuit Banks 1 and 2 Sensor 1 |
| P1032 | HO2S Heater Warm Up Control Circuit Banks 1 and 2 Sensor 1 |
| P1105 | Secondary Vacuum Sensor Circuit |
| P1106 | Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent High Voltage |
| P1107 | Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent Low Voltage |
| P1108 | BARO to MAP Sensor Comparison Too High |
| P1109 | Secondary Port Throttle System |
| P1111 | Intake Air Temperature (IAT) Sensor Circuit Intermittent High Voltage |
| P1112 | Intake Air Temperature (IAT) Sensor Circuit Intermittent Low Voltage |
| P1113 | Intake Resonance Switchover Solenoid Control Circuit |
| P1114 | Engine Coolant Temperature (ECT) Sensor Circuit Intermittent Low Voltage |
| P1115 | Engine Coolant Temperature (ECT) Sensor Circuit Intermittent High Voltage |
| P1116 | ECT Signal Unstable or Intermittent |
| P1117 | Engine Coolant Temp. Signal Out-Of-Range Low |
| P1118 | Engine Coolant Temp. Signal Out-Of-Range High |
| P1119 | ECT Signal Out-Of-Range With TFT Sensor |
| P1120 | Throttle Position (TP) Sensor 1 Circuit |
| P1121 | Throttle Position (TP) Sensor Circuit Intermittent High Voltage |
| P1122 | Throttle Position (TP) Sensor Circuit Intermittent Low Voltage |
| P1125 | APP System |
| P1130 | HO2S Circuit Low Variance Bank 1 Sensor 1 |
| P1131 | HO2S Circuit Low Variance Bank 1 Sensor 2 |
| P1132 | HO2S Circuit Low Variance Bank 2 Sensor 1 |
| P1133 | HO2S Insufficient Switching Bank 1 Sensor 1 |
| P1134 | HO2S Transition Time Ratio Bank 1 Sensor 1 |
| P1135 | HO2S Lean Mean Bank 1 Sensor 1 |
| P1136 | HO2S Rich Mean Bank 1 Sensor 1 |
| P1137 | HO2S Bank 1 Sensor 2 Lean System or Low Voltage |
| P1138 | HO2S Bank 1 Sensor 2 Rich or High Voltage |
| P1139 | HO2S Insuff. Switching Bank 1 Sensor 2 |
| P1140 | HO2S Transition Time Ratio Bank 1 Sensor 2 |
| P1141 | HO2S Heater Control Circuit Bank 1 Sensor 2 |
| P1143 | HO2S Bank 1 Sensor 3 Lean System or Low Voltage |
| P1144 | HO2S Bank 1 Sensor 3 Rich or High Voltage |
| P1145 | HO2S Cross Counts Bank 1 Sensor 3 |
| P1153 | HO2S Insufficient Switching Bank 2 Sensor 1 |
| P1154 | HO2S Transition Time Ratio Bank 2 Sensor 1 |
| P1155 | HO2S Lean Mean Bank 2 Sensor 1 |
| P1156 | HO2S Rich Mean Bank 2 Sensor 1 |
| P1157 | HO2S Bank 2 Sensor 2 Lean System or Low Voltage |
| P1158 | HO2S Bank 2 Sensor 2 Rich or High Voltage |
| P1159 | HO2S Cross Counts Bank 2 Sensor 2 |
| P1161 | HO2S Heater Control Circuit Bank 2 Sensor 2 |
| P1163 | HO2S Bank 2 Sensor 3 Lean System or Low Voltage |
| P1164 | HO2S Bank 2 Sensor 3 Rich or High Voltage |
| P1165 | HO2S Cross Counts Bank 2 Sensor 3 |
| P1170 | Bank to Bank Fuel TrimOffset |
| P1171 | Fuel System Lean During Acceleration |
| P1185 | Engine Oil Temperature Circuit |
| P1186 | EOT Circuit Performance |
| P1187 | EOT Sensor Ckt. Low Voltage |
| P1188 | EOT Sensor Ckt. High Voltage |
| P1189 | Engine Oil Pressure (EOP) Switch Circuit |
| P1190 | Engine Vacuum Leak |
| P1191 | Intake Air Duct Air Leak |
| P1200 | Injector Control Circuit |
| P1201 | (Alt. Fuel) Gas Mass Sensor Circuit Range/Performance |
| P1202 | (Alt. Fuel) Gas Mass Sensor Circuit Low Frequency |
| P1203 | (Alt. Fuel) Gas Mass Sensor Circuit High Frequency |
| P1211 | Mass Air Flow Circuit Intermittent High |
| P1212 | Mass Air Flow Circuit Intermittent Low |
| P1214 | Injection Pump Timing Offset |
| P1215 | Ground Fault Detection Indicated |
| P1216 | Fuel Solenoid Response Time Too Short |
| P1217 | Fuel Solenoid Response Time Too Long |
| P1218 | Injection Pump Calibration Circuit |
| P1219 | Throttle Position Sensor Reference Voltage |
| P1220 | Throttle Position (TP) Sensor 2 Circuit |
| P1221 | Fuel Pump Secondary Circuit Low |
| P1222 | Injector Control Circuit Intermittent |
| P1225 | Injector Circuit Cylinder 2 Intermittent |
| P1228 | Injector Circuit Cylinder 3 Intermittent |
| P1231 | Injector Circuit Cylinder 4 Intermittent |
| P1234 | Injector Circuit Cylinder 5 Intermittent |
| P1237 | Injector Circuit Cylinder 6 Intermittent |
| P1240 | Injector Circuit Cylinder 7 Intermittent |
| P1243 | Injector Circuit Cylinder 8 Intermittent |
| P1245 | Intake Plenum Switchover Valve |
| P1250 | Early Fuel Evaporation Heater Circuit |
| P1257 | Supercharger System Overboost |
| P1258 | Engine Coolant Overtemperature – Protection Mode Active |
| P1260 | Last Test Failed Failed SCC ENTER:More Info. |
| P1270 | Accelerator Pedal Position Sensor A/D Converter Error |
| P1271 | Accelerator Pedal Position (APP) Sensor 1-2 Correlation |
| P1272 | Accelerator Pedal Position Sensor 2 |
| P1273 | “Accelerator Pedal Position Sensor 1 |
| P1274 | Injectors Wired Incorrectly |
| P1275 | Accelerator Pedal Position (APP) Sensor 1 Circuit |
| P1276 | Accelerator Pedal Position Sensor 1 Circuit Performance |
| P1277 | Accelerator Pedal Position Sensor 1 Circuit Low Voltage |
| P1278 | Accelerator Pedal Position Sensor 1 Circuit High Voltage |
| P1280 | Accelerator Pedal Position (APP) Sensor 2 Circuit |
| P1281 | Accelerator Pedal Position Sensor 2 Circuit Performance |
| P1282 | Accelerator Pedal Position Sensor 2 Circuit Low Voltage |
| P1283 | Accelerator Pedal Position Sensor 2 Circuit High Voltage |
| P1285 | Accelerator Pedal Position Sensor 3 Circuit |
| P1286 | Accelerator Pedal Position Sensor 3 Circuit Performance |
| P1287 | Accelerator Pedal Position Sensor 3 Circuit Low Voltage |
| P1288 | Accelerator Pedal Position Sensor 3 Circuit High Voltage |
| P1300 | Ignitor Circuit DTC |
| P1305 | Ignition Coil 2 Primary Feedback Circuit |
| P1310 | Ignition Coil 3 Primary Feedback Circuit |
| P1315 | Ignition Coil 4 Primary Feedback Circuit |
| P1320 | IC 4X Reference Circuit Intermittent |
| P1321 | Electronic Ignition System Fault Line |
| P1322 | EI System or Ignition Control Extra or Missing |
| P1323 | IC 24X Reference Circuit Low Frequency |
| P1324 | Crank RPM Too Low |
| P1335 | CKP Circuit |
| P1336 | Crankshaft Position (CKP) System Variation Not Learned |
| P1345 | Crankshaft Position (CKP)-Camshaft Position (CMP) Correlation |
| P1346 | Intake Camshaft Position [CMP] Sensor System Performance |
| P1350 | Ignition Control System |
| P1351 | Ignition Coil Control Circuit High Voltage |
| P1352 | IC Output High/Pulse Detected when GND_Cyl. 2 |
| P1353 | IC Output High/Pulse Detected when GND_Cyl. 3 |
| P1354 | IC Output High/Pulse Detected when GND_Cyl. 4 |
| P1355 | IC Output High/Pulse Detected when GND_Cyl. 5 |
| P1356 | IC Output High/Pulse Detected when GND_Cyl. 6 |
| P1357 | IC Output High/Pulse Detected when GND_Cyl. 7 |
| P1358 | IC Output High/Pulse Detected when GND_Cyl. 8 |
| P1359 | Ignition Coil Group 1 Control Circuit |
| P1360 | Ignition Coil Group 2 Control Circuit |
| P1361 | Ignition Coil Control Circuit Low Voltage |
| P1362 | IC Cylinder 2 Not Toggling After Enable |
| P1363 | IC Cylinder 3 Not Toggling After Enable |
| P1364 | IC Cylinder 4 Not Toggling After Enable |
| P1365 | IC Cylinder 5 Not Toggling After Enable |
| P1366 | IC Cylinder 6 Not Toggling After Enable |
| P1367 | IC Cylinder 7 Not Toggling After Enable |
| P1368 | IC Cylinder 8 Not Toggling After Enable |
| P1370 | IC 4X Reference Circuit Too Many Pulses |
| P1371 | IC 4X Reference Circuit Too Few Pulses |
| P1372 | Crankshaft Position (CKP) Sensor A-B Correlation |
| P1374 | 3X Reference Circuit |
| P1375 | IC 24X Reference Circuit High Voltage |
| P1376 | Ignition Ground Circuit |
| P1377 | IC Cam Pulse To 4X Reference Pulse |
| P1380 | Misfire Detected – Rough Road Data Not Available |
| P1381 | Misfire Detected – No Communication with Brake Control ModuleP1390 |
| P1390 | Wheel Speed Sensor 1 – G – Sensor Circuit |
| P1391 | Wheel Speed Sensor 1 – G – Sensor Circuit Performance |
| P1392 | Wheel Speed Sensor 1 – G – Sensor Circuit Low Voltage |
| P1393 | Wheel Speed Sensor 1 – G – Sensor Circuit High Voltage |
| P1394 | Wheel Speed Sensor 1 – G – Sensor Circuit Intermittent |
| P1395 | Wheel Speed Sensor 2 – G – Sensor Circuit |
| P1396 | Wheel Speed Sensor 2 – G – Sensor Circuit Performance |
| P1397 | Wheel Speed Sensor 2 – G – Sensor Circuit Low Voltage |
| P1398 | Wheel Speed Sensor 2 – G – Sensor Circuit High Voltage |
| P1399 | Wheel Speed Sensor 2 – G – Sensor Circuit Intermittent |
| P1403 | Exhaust Gas Recirculation System Valve 1 |
| P1404 | Exhaust Gas Recirculation (EGR) Closed Position PerformanceP1405 |
| P1405 | Exhaust Gas Recirculation System Valve 3 |
| P1406 | EGR Valve Pintle Position Circuit |
| P1407 | EGR Air Intrusion in Exhaust Supply to EGR Valve |
| P1408 | Intake Manifold Pressure Sensor Circuit |
| P1409 | EGR Vacuum System Leak |
| P1410 | Fuel Tank Pressure System |
| P1415 | Secondary Air Injection (AIR) System Bank 1 |
| P1416 | Secondary Air Injection (AIR) System Bank 2 |
| P1418 | Secondary Air Injection System Relay A Control Circuit HighP1420 |
| P1420 | Intake Air Low Pressure Switch Circuit Low Voltage |
| P1421 | Intake Air Low Pressure Switch Circuit High Voltage |
| P1423 | Intake Air High Pressure Switch Circuit High Voltage |
| P1431 | Fuel Level Sensor 2 Circuit Performance |
| P1432 | Fuel Level Sensor 2 Circuit Low Voltage |
| P1433 | Fuel Level Sensor 2 Circuit High Voltage |
| P1441 | Evaporative Emission (EVAP) System Flow During Non-Purge |
| P1442 | EVAP Vacuum Sw. High Voltage During Ign. On |
| P1450 | Barometric Pressure Sensor Circuit |
| P1451 | Barometric Press. Sensor Performance |
| P1460 | Cooling Fan Control System |
| P1460 | Misfire Detected With Low Fuel Level |
| P1480 | Cooling Fan 1 Control Circuit High |
| P1483 | Engine Cooling System Performance |
| P1500 | Starter Signal Circuit |
| P1501 | Theft Deterrent System |
| P1501 | Vehicle Speed Sensor Circuit Intermittent |
| P1502 | Theft Deterrent Fuel Enable Signal Not Received |
| P1503 | Theft Deterrent Fuel Enable Signal Not Correct |
| P1504 | Vehicle Speed Output Circuit |
| P1508 | Idle Speed Low – Idle Air Control (IAC) System Not RespondingP1509 |
| P1509 | Idle Speed High – Idle Air Control (IAC) System Not RespondingP1510 |
| P1510 | Throttle Control System Performance – Throttle Limitation ActiveP1511 |
| P1511 | Throttle Control System – Backup System Performance |
| P1514 | Airflow to TP Sensor Correlation High |
| P1515 | Electronic Throttle System Throttle Position |
| P1516 | Throttle Actuator Control (TAC) Module Throttle Actuator Position PerformanceP1517 |
| P1517 | Electronic Throttle Module |
| P1518 | Electronic Throttle Module to PCM Communication |
| P1519 | Throttle Actuator Control (TAC) Module Internal Circuit |
| P1520 | Transmission Range Switch Circuit |
| P1521 | Transmission Engaged at High Throttle Angle |
| P1522 | Park/Neutral to Drive/Reverse at High RPM |
| P1523 | Throttle Closed Position Performance |
| P1524 | Throttle Closed Position Performance |
| P1525 | Throttle Body ServiceRequired |
| P1526 | Minimum Throttle Position Not Learned |
| P1527 | Transmission Range to Pressure Switch Correlation |
| P1528 | GovernorP1529 |
| P1529 | Heated Windshield Request Problem |
| P1530 | Throttle Actuator Control (TAC) Module Internal Circuit |
| P1531 | A/C Low Side Temperature Sensor Fault |
| P1532 | A/C Evaporator Temp. Sens. Ckt. Low Voltage |
| P1533 | A/C Evaporator Temp. Sens. Ckt. High Voltage |
| P1534 | A/C High Side Temp. Sensor Low Voltage |
| P1535 | A/C High Side Temperature Sensor Circuit |
| P1536 | Engine Coolant Overtemperature – Air Conditioning (A/C) DisabledP1537 |
| P1537 | A/C Request Circuit Low Voltage |
| P1538 | A/C Request Circuit High Voltage |
| P1539 | A/C Clutch Status Circuit High Voltage |
| P1540 | Air Conditioning (A/C) Refrigerant Overpressure – Air Conditioning (A/C) DisabledP1541 |
| P1541 | A/C High Side Over Temperature |
| P1542 | A/C System High Pressure High Temperature |
| P1543 | A/C System Performance |
| P1544 | A/C Refrigerant Condition Very Low |
| P1545 | Air Conditioning (A/C) Clutch Relay Control Circuit |
| P1546 | A/C Clutch Status Circuit Low Voltage |
| P1547 | A/C System Performance Degraded |
| P1548 | A/C Recirculation Circuit |
| P1554 | Cruise Control Feedback Circuit |
| P1555 | Electronic Variable Orifice Output |
| P1558 | Cruise Control Servo Indicates Low |
| P1559 | Cruise Control Power Management Mode |
| P1560 | Transaxle Not in Drive – Cruise Control Disabled |
| P1561 | Cruise Vent Solenoid |
| P1562 | Cruise Vacuum Solenoid |
| P1563 | Cruise Vehicle Speed/Set Speed Difference Too High |
| P1564 | Vehicle Acceleration Too High – Cruise Control Disabled |
| P1565 | Cruise Servo Position Sensor |
| P1566 | Engine RPM Too High – Cruise Control Disabled |
| P1567 | Active Banking Control Active – Cruise Control Disabled |
| P1568 | Cruise Servo Stroke Greater than Commanded in Cruise |
| P1569 | Cruise Servo Stroke High While not in Cruise |
| P1570 | Traction Control Active – Cruise Control Disabled |
| P1571 | Traction Control Torque Request Circuit |
| P1572 | ASR Active Circuit Low Too Long |
| P1573 | PCM/EBTCM Serial Data Circuit |
| P1574 | Stoplamp Switch Circuit |
| P1575 | Extended Travel Brake Switch Circuit |
| P1576 | BBV Sensor Ckt. High Voltage |
| P1577 | BBV Sensor Ckt. Low Voltage |
| P1578 | BBV Sensor Ckt. Low Vacuum |
| P1579 | P/N to D/R at High Throttle Angle – Power Reduction Mode ActiveP1580 |
| P1580 | Cruise Move Circuit Low Voltage |
| P1581 | Cruise Move Circuit High Voltage |
| P1582 | Cruise Direction Circuit Low Voltage |
| P1583 | Cruise Direction CircuitHigh Voltage |
| P1584 | Cruise Control Disabled |
| P1585 | Cruise Control Inhibit Output Circuit |
| P1586 | Cruise Control Brake Switch 2 Circuit |
| P1587 | Cruise Control Clutch Control Circuit Low |
| P1588 | Cruise Control Clutch Control Circuit High |
| P1599 | Engine Stall or Near Stall Detected |
| P1600 | TCM Internal Watchdog Operation |
| P1601 | Serial Comm. Problem With Device 1 |
| P1602 | Knock Sensor (KS) Module Performance |
| P1603 | Loss of SDM Serial Data |
| P1604 | Loss of IPC Serial Data |
| P1605 | Loss of HVAC Serial Data |
| P1606 | Serial Communication Problem With Device 6 |
| P1607 | Serial Communication Problem With Device 7 |
| P1608 | Serial Communication Problem With Device 8 |
| P1609 | Loss Of TCS Serial Data |
| P1610 | Loss of PZM Serial Data |
| P1611 | Loss of CVRTD Serial Data |
| P1612 | Loss of IPM Serial Data |
| P1613 | Loss of DIM Serial Data |
| P1614 | Loss of RIM Serial Data |
| P1615 | Loss of VTD Serial Data |
| P1617 | Engine Oil Level Switch Circuit |
| P1619 | Engine Oil Life Monitor Reset Circuit |
| P1620 | Low Coolant Circuit |
| P1621 | Control Module Long Term Memory Performance |
| P1622 | Cylinder SelectP1623 |
| P1623 | Transmission Temp Pull-Up Resistor |
| P1624 | Customer Snapshot Requested – Data Available |
| P1625 | TCM System Reset |
| P1626 | Theft Deterrent Fuel Enable Signal Not Received |
| P1627 | A/D PerformanceP1628 |
| P1628 | ECT Pull-Up Resistor |
| P1629 | Theft Deterrent System – Cranking Signal |
| P1630 | Theft Deterrent Learn Mode Active |
| P1631 | Theft Deterrent Start Enable Signal Not Correct |
| P1632 | Theft Deterrent Fuel Disable Signal Received |
| P1633 | Ignition 0 Switch Circuit |
| P1634 | Ignition 1 Switch Circuit |
| P1635 | 5 Volt Reference Circuit |
| P1636 | PCM Stack Overrun |
| P1637 | Generator L-Terminal Circuit |
| P1638 | Generator F-Terminal Circuit |
| P1639 | 5 Volt Reference 2 Circuit |
| P1640 | Driver-1-Input High Voltage |
| P1641 | Malfunction Indicator Lamp (MIL) Control Circuit |
| P1642 | Vehicle Speed Output Circuit |
| P1643 | Engine Speed Output Circuit |
| P1644 | Traction Control Delivered Torque Output Circuit |
| P1645 | Evaporative Emission (EVAP) Vent Solenoid Contorl Circuit |
| P1646 | Evaporative Emission (EVAP) Vent Solenoid Control Circuit |
| P1647 | Driver 1 Line 7P1650 |
| P1650 | Control Module Output B Circuit |
| P1651 | Fan 1 Relay Control Circuit |
| P1652 | Powertrain Induced Chassis Pitch Output Circuit |
| P1653 | Oil Level Lamp Control Circuit |
| P1654 | Cruise Control Inhibit Output Circuit |
| P1655 | EVAP Purge Solenoid Control Circuit |
| P1656 | Driver 2 Line 6P1657 |
| P1657 | 1-4 Upshift Solenoid Control Circuit |
| P1658 | Starter Enable Relay Control Circuit |
| P1660 | Cooling Fan Control Circuits |
| P1661 | MIL Control Circuit |
| P1662 | Cruise Lamp Control Circuit |
| P1663 | Oil Life Lamp Control Circuit |
| P1664 | 1-4 Upshift Lamp Control Circuit |
| P1665 | Driver 3 Line 5P1666 |
| P1666 | Driver 3 Line 6P1667 |
| P1667 | Reverse Inhibit Solenoid Control Circuit |
| P1669 | ABS Unit Expected |
| P1670 | Driver 4P1671 |
| P1671 | Driver 4 Line 1P1672 |
| P1672 | Low Engine Oil Level Lamp Control Circuit |
| P1673 | Engine Hot Lamp Control Circuit |
| P1674 | Tachometer Control Circuit |
| P1675 | EVAP Vent Solenoid Control Circuit |
| P1676 | Driver 4 Line 6P1677 |
| P1677 | Driver 4 Line 7P1680 |
| P1680 | Driver 5P1681 |
| P1681 | Driver 5 Line 1P1682 |
| P1682 | Driver 5 Line 2P1683 |
| P1683 | Driver 5 Line 3P1684 |
| P1684 | Driver 5 Line 4P1685 |
| P1685 | Driver 5 Line 5P1686 |
| P1686 | Driver 5 Line 6P1687 |
| P1687 | Driver 5 Line 7P1689 |
| P1689 | Delivered Torque Circuit Fault |
| P1690 | ECM Loop Overrun |
| P1691 | Coolant Gage Circuit Low Voltage |
| P1692 | Coolant Gage Circuit High Voltage |
| P1693 | Tachometer Circuit Low Voltage |
| P1694 | Tachometer Circuit High Voltage |
| P1695 | Remote Keyless Entry Circuit Low |
| P1696 | Remote Keyless Entry Voltage High |
| P1700 | Transmission Control Module (TCM) Requested MIL IlluminationP1701 |
| P1701 | Trans. MIL Request Circuit |
| P1705 | P/N Signal Output Circuit |
| P1740 | Torque Reduction Signal Circuit |
| P1743 | TP Signal from ECM |
| P1760 | TCM Supply Voltage Interrupted |
| P1779 | Engine Torque Delivered to TCM Signal |
| P1780 | Park/Neutral Position [PNP] Switch Circuit |
| P1781 | Engine Torque Signal Circuit |
| P1790 | Transmission Control Module Checksum |
| P1791 | Transmission Control Module Loop |
| P1792 | Transmission Control Module Reprogrammable Memory |
| P1792 | ECM to TCM Engine Coolant Signal |
| P1793 | Transmission Control Module Stack Overrun |
| P1795 | CAN Bus – Throttle Body Position |
| P1800 | TCM Power Relay Control Circuit |
| P1801 | Performance Selector Switch Failure |
| P1804 | Ground Control Relay |
| P1810 | TFP Valve Position Switch Circuit |
| P1811 | Maximum Adapt and Long Shift |
| P1812 | Transmission Over Temperature Condition |
| P1813 | Torque ControlP1814 |
| P1814 | Torque Converter Overstressed |
| P1815 | Transmission Range Switch – Start In Wrong Range |
| P1816 | TFP Valve Position Sw. – Park/Neu. With Drive Ratio |
| P1817 | TFP Valve Position Sw. – Reverse With Drive Ratio |
| P1818 | TFP Valve Position Sw. – Drive Without Drive Ratio |
| P1819 | Internal Mode Switch – No StartWrong Range |
| P1820 | Internal Mode Switch Circuit A Low |
| P1822 | Internal Mode Switch Circuit B High |
| P1823 | Internal Mode Switch Circuit P Low |
| P1825 | Internal Mode Switch – Invalid Range |
| P1826 | Internal Mode Switch Circuit C – High |
| P1831 | PC Solenoid Power Circuit – Low Voltage |
| P1833 | A/T Solenoids Power Circuit – Low Voltage |
| P1835 | Kick-Down Switch Circuit |
| P1836 | Kick-Down Switch Failed Open |
| P1837 | Kick-Down Switch Failed Short |
| P1842 | 1-2 Shift Solenoid Circuit Low Voltage |
| P1843 | 1-2 Shift Solenoid Circuit High Voltage |
| P1844 | Torque Reduction Signal Circuit Desired By TCM |
| P1845 | 2-3 Shift Solenoid Circuit Low Voltage |
| P1847 | 2-3 Shift Solenoid Circuit High Voltage |
| P1850 | Brake Band Apply Solenoid Circuit |
| P1851 | Brake Band Apply Solenoid Performance |
| P1852 | Brake Band Apply SolenoidLow Voltage |
| P1853 | Brake Band Apply Solenoid High Voltage |
| P1860 | TCC PWM Solenoid Circuit Electrical |
| P1864 | Torque Converter Clutch Circuit |
| P1868 | Transmission Fluid Life |
| P1870 | Transmission Component Slipping |
| P1871 | Undefined Gear Ratio |
| P1873 | TCC Stator Temp. Switch Circuit Low |
| P1874 | TCC Stator Temp. Switch Circuit High |
| P1875 | 4WD Low Switch Circuit Electrical |
| P1884 | TCC Enable/Shift Light Circuit |
| P1886 | Shift Timing Solenoid |
| P1887 | TCC Release Switch Circuit |
| P1890 | ECM Data Input Circuit |
| P1890 | Throttle Position Signal Input |
| P1891 | Throttle Position Sensor PWM Signal Low |
| P1892 | Throttle Position Sensor PWM Signal High |
| P1893 | Engine Torque Signal Low Voltage |
| P1894 | Engine Torque Signal High Voltage |
| P1895 | TCM to ECM Torque Reduction Circuit |
[It’s important to remember that this GM OBD2 codes list is for informational purposes only. It’s not a substitute for professional diagnostic advice. If you encounter a trouble code, it’s always recommended to consult a certified mechanic for proper diagnosis and repair.]
This GM OBD2 codes list provides a starting point for understanding potential issues with your General Motors vehicle. By using this list in conjunction with an OBD2 scanner and, when necessary, a professional mechanic, you can effectively diagnose and address car problems, keeping your GM vehicle running smoothly.
Disclaimer: This information is for informational purposes only and not intended as repair advice. We are not responsible for any actions taken on any vehicle based on this information. All content is copyright protected.
