* Resetting the PCM (Powertrain Control Module): This is the main computer that controls the engine and transmission. There's no button to do this. A PCM reset usually involves disconnecting the battery's negative terminal for a period of time (at least 30 minutes, sometimes longer). This clears the PCM's memory and allows it to relearn the vehicle's parameters. Caution: This will clear the radio presets and possibly other personalized settings.
* Resetting the Electronic Control Unit (ECU) or other modules: Similar to the PCM, most modules (like the Body Control Module) don't have a reset button. Disconnecting the battery's negative terminal will often reset these as well.
* Troubleshooting a specific issue: If you're having a specific problem (like a check engine light), simply resetting the computer might not fix it. You'll need to diagnose the underlying cause. An OBD-II scanner can help read diagnostic trouble codes (DTCs) to pinpoint the problem.
To disconnect the battery's negative terminal:
1. Locate the battery: Usually under the hood.
2. Gather tools: You'll need a wrench or socket that fits the battery terminal nut.
3. Disconnect the negative terminal: Locate the negative (-) terminal (usually marked with a "-" symbol). Loosen and remove the nut holding the cable to the terminal. Carefully pull the cable off the terminal.
4. Wait: Wait at least 30 minutes (some recommend up to an hour or even overnight).
5. Reconnect the negative terminal: Attach the negative cable back to the terminal and tighten the nut securely.
6. Start the vehicle: Turn the ignition on and see if the problem is resolved.
Important Considerations:
* Safety First: Always disconnect the negative terminal first to avoid accidental short circuits.
* Professional Help: If you're uncomfortable working on your vehicle's electrical system, it's best to take it to a qualified mechanic. They have the tools and knowledge to diagnose and fix problems more effectively.
* Specific Problem: Describe the problem you're trying to solve. This will help determine the best course of action. For example, "My check engine light is on," requires a different approach than "My radio is not working."
In summary, there's no "reset computer" button. Disconnecting the battery negative terminal is the closest equivalent to a reset for most electronic control units in your 2001 Dodge Durango. Remember to consult a repair manual or a qualified mechanic if you're unsure about any of these steps.
