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DTC codes / P2Axx · Hybrid propulsion / P2A21
P2A21 indicates that the engine control module has detected an abnormally high signal in the fuel metering control circuit for injection pump circuit F, which is associated with the cam, rotor, or injector on high-pressure fuel systems. The computer compares commanded fuel quantity against the actual feedback from the pump's metering actuator and sets this code when the circuit voltage or current exceeds the expected range for the operating conditions.
Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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