* Reset the PCM (Powertrain Control Module): This is the main computer controlling the engine and transmission. There's no button to push. A PCM reset usually involves disconnecting the negative battery terminal for a period of time (30 minutes to overnight is typical). This clears the short-term memory but preserves long-term calibrations.
* Reset a specific module (like the radio): Some modules might have their own reset procedures (check your owner's manual). For example, the radio might have a specific button combination or require a fuse to be pulled and reinserted.
* Clear trouble codes (check engine light): This is done using a scan tool, not a button press. An OBDII scanner can read and clear trouble codes stored in the PCM. Auto parts stores often offer free code reading services.
* Reset the trip odometer: This is usually a button on the instrument cluster. Consult your owner's manual for the specific procedure.
To reset the PCM (most likely what you intend):
1. Disconnect the negative (-) battery terminal. Use a wrench to loosen the nut and carefully remove the cable.
2. Wait. Wait at least 30 minutes, preferably longer (up to several hours). This allows the capacitors in the PCM to fully discharge.
3. Reconnect the negative (-) battery terminal.
4. Start the engine. Let the engine run for a few minutes to allow the PCM to relearn.
Important Note: Before doing anything, consult your owner's manual for specific instructions regarding your vehicle. Incorrect procedures could damage your vehicle's electrical system. If you're unsure, take your Durango to a qualified mechanic.
