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DTC codes / P2Axx · Hybrid propulsion / P2A18
P2A18 indicates that the powertrain control module has detected an abnormally low fuel metering signal from the injection pump's control circuit D, which may involve the cam, rotor, or injector interface depending on the pump design. The computer compares the commanded fuel quantity with the feedback from the metering control circuit and sets this code when the actual current or voltage stays below the expected range for a calibrated time.
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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