P2A89Alternative Fuel Pump C Compression Stroke Valve Control Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2A89 is set when the drive circuit of pump C's compression stroke valve reads low for the commanded state. Most often the control wire has found a path to ground, so the solenoid may stay on, or the coil has shorted turns and pushes the output stage into current limiting. A valve stuck in fill keeps pressurised oil behind element C; that element stops cycling, and the others have to carry its share. Expect reduced fuel delivery at high load rather than an immediate stall, at least on pumps with several elements like Caterpillar's design. No manufacturer publishes P2A89. Unplug valve C and check whether the short to ground remains in the harness; if it disappears, the coil is the likely culprit.
- What you may notice
- Warning lamp on
- Reduced power at high load
- Likely causes
- LikelyControl wire of valve C shorted to ground
- PossibleShorted turns in the coil of valve C
- 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.