OBD-II code · Powertrain (generic, extended)
P2A79 Alternative Fuel Hydraulic Pump Pressure Sensor Circuit Intermittent/Erratic
The alternative fuel hydraulic pump pressure sensor signal drops out or jumps intermittently. Loose connector or noisy ground.
Is it safe to drive with P2A79?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySensor connector not seated
- PossibleNoisy ground reference
- Less likelyConnector with intermittent contact under vibration
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–4 h
- Emissions test
- Likely to fail
- Parts involved
- Alt Fuel Hyd Pump Pressure Sensor, Wiring Harness, Afcm
Related codes
- P2A76Alternative Fuel Hydraulic Pump Pressure Sensor Range/Performance
- P2A77Alternative Fuel Hydraulic Pump Pressure Sensor Circuit Low
- P2A78Alternative Fuel Hydraulic Pump Pressure Sensor Circuit High
- P2A7AAlternative Fuel Hydraulic Pressure Sensor Circuit
- P2A7BAlternative Fuel Hydraulic Pressure Sensor Range/Performance
- P2A7CAlternative Fuel Hydraulic Pressure Sensor Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.