P2A7A code meaning
Alternative Fuel Hydraulic Pressure Sensor Circuit
Powertrain system Generic code P2Axx codes Check engine light
What P2A7A means
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.
P2A7A at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor1 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2A7A
- Warning lamp on
- Reduced LNG delivery or power limitation
Common causes of P2A7A
- Most likelyDamaged connector or harness at the hydraulic sensor
- PossibleHydraulic pressure sensor faulty
- Less likelyFault in a sensor reference or ground shared with other sensors
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Alt fuel hyd pressure sensorWiring harnessAfcm
What each part of P2A7A means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| A | Area: hybrid propulsion. |
| 7A | The exact fault in that area. |
What to do next
- Note P2A7A and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2A7A
What does P2A7A mean?
P2A7A means "Alternative Fuel Hydraulic Pressure Sensor Circuit". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P2A7A?
Drive gently and only to a workshop. With P2A7A the car can go into limp mode (reduced power) to protect itself.
Will P2A7A fail an emissions test?
Yes, it can. P2A7A is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2A7A to fix?
Difficulty: hard. A typical repair takes 1 to 3 hours of work. This is a job for a workshop.
Will P2A7A clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.