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DTC codes / P2Axx · Hybrid propulsion / P2A81
P2A81 indicates that the powertrain control module has detected a low-voltage condition on the control circuit for the compression stroke valve of alternative fuel pump A. This valve is used in some alternative fuel systems to manage pump operation, and a low circuit voltage means the PCM cannot reliably command the valve, which may prevent the pump from building pressure or delivering fuel correctly.
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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