How to Reset the ECM on a Chevy Truckby Ryan Bauer
Every Chevrolet truck has an engine control module that manages the electronic components of the engine and monitors sensors for errors. Returning the ECM to its factory state may be necessary to troubleshoot or resolve a number of problems.
Remove the nut from the negative battery cable using a socket set or wrench. Slide the cable off of the battery and set it aside.
Turn the headlight switch to the "On" position to drain the ECM of any remaining power. Wait at least 10 minutes, then turn it back to the "Off" position.
Replace the negative battery cable by reversing the previous steps. Tighten the nut until it feels secure, paying attention not to overtighten it. The ECM has now been reset.
- If you find it difficult to keep the battery cable from touching the negative terminal, use a non-conductive material such as rubber as a barrier.
- The negative cable is the black one marked with a minus sign.
- Do not allow the negative cable to touch the positive one, or allow your tool to bridge the two terminals.