P2A76 code meaning
Alternative Fuel Hydraulic Pump Pressure Sensor Range/Performance
Powertrain system Generic code P2Axx codes Check engine light
What P2A76 means
P2A76 is set when the hydraulic pump pressure reading looks electrically sound yet makes no sense for the operating state. Westport's patent explains why a fixed expectation is not enough: pressure rises with hydraulic pump speed, which follows engine speed when the pump is engine-driven, and with the LNG pressure the cryogenic pump works against. The controller therefore corrects its thresholds with a look-up table. A reading that stays flat while the pump strokes, shows no drop at stroke end, or disagrees with downstream fuel pressure points to a drifting sensor, but also to worn pump seals or low oil level. No manufacturer publishes P2A76 or its limits. Compare with a mechanical gauge on the test port and check the oil level.
P2A76 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 5 hours
- Clears after repairAfter a drive cycle
Symptoms of P2A76
- Check engine light on
- Uneven LNG pressure or slow pressure build-up
- Empty-tank warning although LNG remains
Common causes of P2A76
- Most likelyHydraulic pressure sensor drifted
- PossibleLow hydraulic oil level or external leak
- PossibleWorn hydraulic pump or drive seals
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Alt fuel hyd pump pressure sensorWiring harnessAfcm
What each part of P2A76 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. |
| 76 | The exact fault in that area. |
What to do next
- Note P2A76 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 P2A76
What does P2A76 mean?
P2A76 means "Alternative Fuel Hydraulic Pump Pressure Sensor Range/Performance". P2A76 is set when the hydraulic pump pressure reading looks electrically sound yet makes no sense for the operating state. It is a generic code, so it means the same on every make.
Is it safe to drive with P2A76?
Drive gently and only to a workshop. With P2A76 the car can go into limp mode (reduced power) to protect itself.
Will P2A76 fail an emissions test?
Yes, it can. P2A76 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 P2A76 to fix?
Difficulty: workshop only. A typical repair takes 1 to 5 hours of work. This is a job for a workshop.
Will P2A76 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.