P1360 on GM vehicles indicates that the powertrain control module has detected a fault within the ignition control circuit for a specific group of cylinders, often referred to as Group B, which typically covers the second bank or a designated set of coils. The computer monitors the circuit for expected electrical behavior and sets this code when the signal does not match the commanded ignition timing or when the circuit resistance falls outside the factory specification.
Guidance is general and written for GM vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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