I just replaced the motor a few weeks ago and it runs great. Here's the problem: got it back and guage cluster likes to mess up. Battery and passlock light comes on still drivable gauges come back on when they want and shut down when they want.
What is your question?
Battery and alt are good just don't know what is causing it. I can't get the passlock to relearn either to see of it fixes it. I also have the ecm for the replacement motor. Passlock learned but make engine idle rough comes up PO315 camshaft sensor relearn. Any help would be appreciated thanks!!!
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Why did you change the ecm? try putting the old one back in and check for pinched wires and loose connections.
Its possibly its not related, I have seen an alternator that checked good cause an intermittent battery light on a mid 2000 tahoe
