It’s a frustrating situation: you’ve just used your OBD2 scanner to check your car’s diagnostics, and now your car won’t start. Naturally, you might wonder if the OBD2 scanner is the culprit. As an auto repair expert at obd-de.com, I’m here to clarify this issue and guide you through potential causes and solutions.
The truth is, OBD2 scanners are passive devices. They are designed to read information from your car’s computer (Powertrain Control Module or PCM) and display diagnostic trouble codes (DTCs). They do not actively control or modify your car’s systems. Therefore, it’s highly unlikely that simply using an OBD2 scanner would directly cause a no-start condition.
However, the timing might be coincidental, or the act of diagnosing might reveal an underlying issue that was already present. Let’s explore the common reasons why your car might not start, especially in the context of recent OBD2 scanner use.
One area to consider is the fuel delivery system. The PCM controls the fuel pump relay, which in turn powers the fuel pump. When you turn your ignition to the “Run” position, the PCM briefly energizes the fuel pump to pressurize the fuel system for starting. If the PCM isn’t getting power, or there’s an issue with the fuel pump relay or the pump itself, your car won’t start.
Another critical system is the starter system. When you turn the key to the “Crank” position, power flows through safety switches (Neutral Safety Switch for automatics or Clutch Safety Switch for manuals) and the starter solenoid relay to engage the starter motor. The starter motor requires a significant amount of current to turn the engine. Problems like corroded or loose battery cables, a faulty starter solenoid, or a worn-out starter motor can prevent your car from starting.
It’s important to check the basics first. Ensure your battery terminals are clean and tightly connected. High resistance in battery cables can lead to voltage drop, preventing the starter motor from operating effectively. For vehicles, especially older models, a common issue is worn starter solenoid contacts.
In conclusion, while it’s understandable to be concerned after experiencing a no-start issue following OBD2 scanner use, it’s crucial to understand that the scanner itself is unlikely to be the direct cause. Focus on diagnosing the fundamental starting systems – fuel and starter – and systematically check components like the battery, cables, fuel pump relay, and starter solenoid. If you’re unsure, seeking professional diagnostic help is always a wise step to pinpoint the exact reason why your car won’t start.
