LS1 ECM Resetting

Here is a simple way to reset your ECM (Cars Computer)without going to the dealership: If you dont have an Autotap


If your car shows the SES light on and you don't want to make that trip to the dealer to have them turn it off (which they will charge you for), you can reset your computer yourself and the code should go away. NOTE: if the fuses are not removed the codes will remain in the ECM until the fuses are removed.

How - To do this:

Step 1 - Turn key on but don't start car.

Step 2 - Pull PCM BAT and PCM IGN fuses in engine compartment. You should be able to pop open the cover to the fuse box with your hand, if not a small screw will work fine.

Step 3 - With the fuses removed, wait aprox. 5 minutes - make sure your key is still in the ignition in the on position - BUT NOT STARTED.

Step 4 - Turn ignition off.

Step 5 - Replace the two fuses. BE SURE TO PUT THEM BACK WHERE THEY CAME FROM! One is a 10amp, the other is a 15amp, the cover marks them in case you mixed them up.

Step 6 - With the fuses reinstalled, fire up the car and your car should have no SES light and will begin going through the learn process again. It may take a few (3-4) on off cycles to get the idle, fuel and timing down but you shouldn't notice any differences.

Post Me Comments if you have any questions ...