P2A7AAlternative Fuel Hydraulic Pressure Sensor Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2A7A is the general circuit fault of the alternative fuel hydraulic pressure sensor, a measuring point that the code list keeps apart from the hydraulic pump pressure sensor of P2A75. Where it sits is not defined publicly, and no manufacturer documents the split. Patents for hydraulically driven LNG pumps show the candidates: Caterpillar's US9228574B2 places one sensor in the supply line and another in the return line to the reservoir, while Westport's US8726785B2 suggests one sensor per side of the drive piston when pressure is taken at the drive unit. P2A7A is stored when the signal is faulty but fits neither a clear low nor a clear high case. Pump control then lacks one input and may restrict LNG delivery. P2A7C and P2A7D name low and high.
- What you may notice
- Warning lamp on
- Reduced LNG delivery or power limitation
- Likely causes
- LikelyDamaged connector or harness at the hydraulic sensor
- PossibleHydraulic pressure sensor faulty
- RareFault in a sensor reference or ground shared with other sensors
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.