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DTC codes / P2Axx · Hybrid propulsion / P2A79
P2A79 indicates that the powertrain control module (PCM) has detected an intermittent or erratic signal from the hydraulic pump pressure sensor in an alternative fuel system, such as a compressed natural gas (CNG) or liquefied petroleum gas (LPG) vehicle. The PCM expects a stable voltage or pressure reading within a specific range, but the signal is dropping out or fluctuating unpredictably, which can affect fuel pump operation and overall system performance.
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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