Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
Hello, my name is***** you for the question. Can you give me the exact relearn you are using?
Turn the key on to the run position and leave it there for 10 minutes.
Turn the key off without removing it and then back to run for 10 minutes.
Turn the key off without removing it and then back to run for 10 more minutes.
After the third ten minute cycle turn the key off and then try starting it.
Yes. Follow the time frames and not the light.
Yes. I do it with a scan tool, but if I need to do it manually it is by the 10 minutes only.
Then try the reset procedure I mentioned. If it does not work then the new PCM may not be communicating with the BCM.
What was the vehicle doing which caused you to replace the PCM?
Thank you. I have not seen a PCM cause this before. Let me know what happens after the reset.
Is the security light on while cranking the engine? Do you still have the old PCM?
If the light goes out then it should be registering the right key. If not the light would remain lit. Did you try putting the old PCM back in?
If all of the lights go off when holding in the crank position then you may have another issue. You might have a failing ignition switch. Do you have a voltage meter to run through some tests?
I would test the ignition switch. You need to remove the panels to be able to access the back of the switch while it is still connected. First test the power to the switch. Two of the wires should have power. Then install the key and turn it to the run position. You should have power at all but the yellow wire. Then with the key in the crank position the yellow wire should get power. If any of these do not make sense please let me know.