P2A82Alternative Fuel Pump A Compression Stroke Valve Control Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- Warning lamp on
- Falling gas pressure and power loss
- Engine may stall on gas with a single pump element
- Likely causes
- LikelyOpen coil or broken wire at valve A
- PossibleControl wire shorted to battery voltage
- RareCorroded valve connector
- 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: €150 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.