P2874Clutch B Pressure Disengagement Too 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
- P2874 indicates that clutch B keeps excess pressure while it is being released or should already be open. Clutch B then goes on carrying torque alongside the engaged path, which can be felt as binding, vibration during upshifts from even gears or a car that pulls while in neutral; an overheated clutch is a typical consequence. No manufacturer publishes P2874-specific criteria. CARB 13 CCR 1968.2 sets the general requirement, and GM's Corvette dual-clutch module illustrates the approach: it watches the hold pressure of the open clutch and, if that rises too far, starts the recovery routine for that side. Candidates are a valve that fails to vent, debris in the valve body, a seized shutdown valve or a stuck actuator.
- What you may notice
- Binding or vibration on upshifts from even gears
- Car pulls in neutral
- Clutch temperature warning
- Likely causes
- LikelyClutch B valve not venting pressure on release
- PossibleContamination in the valve body from clutch wear
- RareSeized shutdown valve or clutch B actuator
- 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: €100 – €3,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.