P2A8AAlternative Fuel Pump C 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
- P2A8A indicates that pump C's compression stroke valve circuit sits higher than the commanded state allows, from an open coil, a broken wire or a short to the supply rail. The solenoid cannot shift the spool, which stays in the drain position, and element C never starts a compression stroke. Unlike the low fault P2A89, nothing stays pressurised; the element is simply missing from the firing sequence, which the controller covers by firing the remaining ones more often. When P2A8A appears together with P2A82 or P2A86, a shared supply or ground for all valves is more likely than three failed coils. No manufacturer documents P2A8A. Check the common feed and ground before replacing valve C.
- What you may notice
- Warning lamp on
- Uneven gas pressure at high load
- Likely causes
- LikelyOpen coil or broken wire at valve C
- PossibleFault in the supply or ground shared by the pump valves
- RareControl wire shorted to the supply rail
- 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.