P2854Clutch B Pressure Discharge 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
- P2854 is the even-side partner of P2853: the pressure sensor of clutch B reports less than the control model expects. In GM's Corvette software clutch 2 drives the even gears; the check uses the same logic as on clutch 1, with a modeled value above 1 bar facing a reading under 0.5 bar for 5 s, plus a second path that watches the absolute gap between model and sensor. Both lead to a Type A code and a recovery request for the even clutch. Ford's TR9070 summary of 2024 maps measured even clutch pressure below target to P2854. Because the dual-clutch box can still drive on the odd gears, the car usually stays mobile in a reduced mode, but shifts into second and the following even gears are lost.
- What you may notice
- Even gears skipped, car runs in odd gears only
- Slipping or flare on shifts into even gears
- Transmission warning
- Likely causes
- LikelyClutch B pressure control valve restricted by debris or wear
- PossibleSeal leak in the clutch B feed or piston
- RareFoamed or overheated fluid lowering effective pressure
- 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.