How to Change the ECM on a Chevrolet HHR
The main central computer system that is responsible for the proper function of the Chevy HHR is called the electronic control module (ECM). The ECM allows the engine to run properly, making it integral in the function of the HHR.
Because it is such an important component of the function of the Chevy HHR, it is important to make sure the ECM is in good condition and working properly. If the ECM becomes damaged, the car will no longer run properly until it is replaced. Taking out the ECM component properly and replacing it with a new ECM is not difficult and only requires a few simple tools.
Items Needed:
- Replacement ECM
- Screwdriver
- Socket set
Instructions:
- Locate the set of screws that secure the side kick panel on the passenger side to the inside of the fender underneath the fender. Remove the screws with a screwdriver and detach the panel from the fender. This will expose three wire harnesses from the ECM system. The ECM is a silver box containing three ports, each of which have one wiring harness plugged in to them.
- Unplug all three of the wire harnesses from the ECM.
- Use the socket and ratchet to detach the ECM by removing the four bolts securing it onto the fender.
- Place your replacement ECM onto the inside of the fender. Secure it in place by retightening the four bolts with the socket.
- Plug the three wire harnesses into the new ECM. Double check to make sure that you have plugged each harness into its appropriately shaped plug.
- Replace the kick panel on the ECM. Tighten the screws back on to secure.