P2855Clutch A Pressure Charge Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2855 points the other way from P2853: clutch A carries more pressure than the model calls for. GM's Corvette table for clutch 1 uses three paths, all Type A. The measured pressure sits above the model by more than a set difference long enough to be confirmed; the absolute gap grows too large with the reading on the high side; or, while the idle clutch is being held at its hold pressure, where it should pass no torque, the reading climbs more than about 1.2 bar above that level for 300 ms. GM calls this a pressure charge fault and requests the odd clutch recovery. Ford's 2024 TR9070 summary sets P2855 when odd clutch pressure exceeds target. Excess pressure makes the clutch drag or grab, giving harsh launches and possible binding.
- What you may notice
- Harsh engagement or jerky creep from standstill
- Drag felt as if the brakes were applied
- Limp-home mode with warning lamp
- Likely causes
- LikelyClutch A pressure control valve sticking toward high output
- PossibleExcessive line pressure feeding the clutch circuit
- RareClutch adaptation values out of date after repair
- 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 – €4,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.