Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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At the time this is happening, is when you need to check for power to the starter solenoid from the ignition switch.
Ok, this may be a security problem that's intermittent then. The best thing to do is attach a scan tool and ping all the nodes seeking codes and security data.
A code reader won't read all the modules. We really need to access the other ones too, not just the PCM. Most parts stores will loan out a scan tool for a deposit.