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Hi in this video I have a Corsa D that won't start or even crank, I scanned it and had no communication to the engine control module.
Although this had the common fault of water getting into the ECM, it also had no power on 3 of the power feeds to the ECM, this wouldn't help the no communication fault.
I spent time finding out why there was no power on some of the power wires at the ECM, I checked for CAN bus signals to the module too.
This car still didn't communicate to the scan tool even when I powered up the relay that powered the 3 wires that were missing powers.
I hope something here may help someone.
Thanks for watching.