No one chimed in but I figured I’d drop back in to share the source of the issue.
The ECU failed and was leaving the circuit open for bank 1. So I had a dealership install a new ecu and program it.
I have a 2018 Tahoe with a P135a code. It’s only running on the passenger bank.
I checked all the fuses, they look good. I checked the voltage at the plugs and while running, the far left plug (pin 4) is over 12v the other 3 are grounded.
I unplugged 1 from the passenger bank while it was...
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