P2C02: An open fuel-quantity control circuit in the regulator D path

P2C02 identifies an open-circuit diagnosis for the fuel-quantity control valve in this GM fuel-pressure system. The source describes low driver feedback during the off state as the monitored electrical observation. That is different from a rail-pressure performance code, even though both concern fuel regulation.

What the summary supports

The row lists twenty seconds and a one-trip response, along with battery, engine-speed and general diagnostic conditions. It also describes the open-circuit check as occurring when high current flows through the driver. That wording does not sit comfortably with the stated open-load/off-state observation, and the conflict is not resolved by assuming a particular circuit design.

Accordingly, the article does not convert the row into a connector resistance test or prescribe energizing the valve. The safe test method and the meaning of the driver state must come from the correct application documentation.

Evidence worth retaining

Record whether the controller reports an electrical open state and whether rail-pressure performance faults are also present. Pressure failing to reach target is a downstream result; it cannot by itself prove that the command circuit is open. Similarly, a currently plausible pressure does not exclude an intermittent electrical interruption.

Confirmation should establish that the relevant circuit diagnostic ran after the repair, not merely that a stored code was erased. Keep the documented time qualification distinct from the neighbouring entries that count events. Any fuel-system access or powered electrical test requires the prescribed professional procedure because this summary supplies neither pin assignments nor isolation instructions.

Source and applicability

2025 GM 07A-2 documented monitor only; module and calibration applicability must be matched to the vehicle. The application-matrix filename join remains unresolved; no model or engine fitment is inferred. GM PDF, page 739.