P2A83 code meaning
Alternative Fuel Pump B Compression Stroke Valve Control Circuit/Open
Powertrain system Generic code P2Axx codes Check engine light
What P2A83 means
P2A83 reports an open or otherwise faulty control circuit at the compression stroke valve of alternative fuel pump B. Whether a second pump exists depends on the layout: in Westport's patent US8726785B2, two LNG vessels each carry their own hydraulically driven pump, while Caterpillar's multi-element pump splits one unit into several separately switched elements. Either way, pump B's valve no longer admits drive oil, and its share of LNG delivery is lost. On a two-tank truck this can leave fuel stranded in the tank that pump B serves. The meaning of the letter B is not public, and no manufacturer documents P2A83. Where the valves are identical, swapping a connector with a neighbour shows whether the fault follows the coil.
P2A83 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor1 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2A83
- Warning lamp on
- LNG in one tank cannot be used
- Reduced power under high load
Common causes of P2A83
- Most likelyOpen wire or loose connector at valve B
- PossibleSolenoid coil of valve B open
- Less likelyOutput stage for valve B faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Alt fuel pump b compression stroke valveWiring harnessAfcm
What each part of P2A83 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. |
| 83 | The exact fault in that area. |
What to do next
- Note P2A83 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 P2A83
What does P2A83 mean?
P2A83 means "Alternative Fuel Pump B Compression Stroke Valve Control Circuit/Open". P2A83 reports an open or otherwise faulty control circuit at the compression stroke valve of alternative fuel pump B. It is a generic code, so it means the same on every make.
Is it safe to drive with P2A83?
Drive gently and only to a workshop. With P2A83 the car can go into limp mode (reduced power) to protect itself.
Will P2A83 fail an emissions test?
Yes, it can. P2A83 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 P2A83 to fix?
Difficulty: hard. A typical repair takes 1 to 4 hours of work. This is a job for a workshop.
Will P2A83 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.