P2A88Alternative Fuel Pump C Compression Stroke Valve Control Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2A88 reports that the compression stroke valve of pump C works electrically but its effect does not match the command. In a sequenced multi-element pump, each activation should add a similar amount of pressure to the gas accumulator or rail; an element that keeps falling short, or whose share fluctuates, stands out against its neighbours. Since Caterpillar's patent sets stroke length through the duration of the command, a spool that opens late shortens pump C's stroke without any wiring fault. Deposits on the spool, a partly blocked oil passage or worn cryogenic seals are plausible causes. Because the other elements keep running, the driver may notice little apart from the warning lamp. No manufacturer publishes P2A88 or its thresholds.
- What you may notice
- Warning lamp after several drive cycles
- Little noticeable change in driving
- Likely causes
- LikelyDeposits making the spool of valve C open late
- PossiblePartly blocked oil passage to element C
- RareWorn cryogenic seals on element C
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €200 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.