What does code P2A77 mean?

Q: What does code P2A77 mean?

Alternative Fuel Hydraulic Pump Pressure Sensor Circuit Low. P2A77 indicates that the powertrain control module (PCM) has detected a low voltage signal from the hydraulic pump pressure sensor in an alternative fuel system, such as a compressed natural gas or propane injection setup. The sensor circuit is reporting a pressure reading below the expected range, which the PCM interprets as a fault in the sensor, its wiring, or the hydraulic pump's ability to build pressure.

DTC codes / P2Axx · Hybrid propulsion / P2A77

P2A77Alternative Fuel Hydraulic Pump Pressure Sensor Circuit Low

P2A77 indicates that the powertrain control module (PCM) has detected a low voltage signal from the hydraulic pump pressure sensor in an alternative fuel system, such as a compressed natural gas or propane injection setup. The sensor circuit is reporting a pressure reading below the expected range, which the PCM interprets as a fault in the sensor, its wiring, or the hydraulic pump's ability to build pressure.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaHybrid propulsion

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.