P2A82 code meaning
Alternative Fuel Pump A Compression Stroke Valve Control Circuit High
Powertrain system Generic code P2Axx codes Check engine light
What P2A82 means
P2A82 shows the drive line to pump A's compression stroke valve at a higher level than the commanded state permits, most likely because the coil winding or its wire is broken where the valve is switched to ground, or because the line touches battery voltage and the output stage loses control of it. The solenoid then cannot move the spool into the fill position, so oil never reaches the drive side and pump A performs no compression stroke at all. Gas pressure downstream of the pump sinks faster than the controller expects, and on a single-element system the engine soon runs short of fuel. Caterpillar's patents show the spool going back to drain when the solenoid is de-energized, which is the state this fault produces. No manufacturer publishes P2A82. Measure coil resistance and feed voltage.
P2A82 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 P2A82
- Warning lamp on
- Falling gas pressure and power loss
- Engine may stall on gas with a single pump element
Common causes of P2A82
- Most likelyOpen coil or broken wire at valve A
- PossibleControl wire shorted to battery voltage
- Less likelyCorroded valve connector
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Alt fuel pump a compression stroke valveWiring harnessAfcm
What each part of P2A82 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. |
| 82 | The exact fault in that area. |
What to do next
- Note P2A82 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 P2A82
What does P2A82 mean?
P2A82 means "Alternative Fuel Pump A Compression Stroke Valve Control Circuit High". P2A82 shows the drive line to pump A's compression stroke valve at a higher level than the commanded state permits, most likely because the coil winding or its wire is broken where the valve is switched to ground, or because the line touches battery voltage and the output stage loses control of it. It is a generic code, so it means the same on every make.
Is it safe to drive with P2A82?
Drive gently and only to a workshop. With P2A82 the car can go into limp mode (reduced power) to protect itself.
Will P2A82 fail an emissions test?
Yes, it can. P2A82 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 P2A82 to fix?
Difficulty: hard. A typical repair takes 1 to 4 hours of work. This is a job for a workshop.
Will P2A82 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.