P2873Clutch B Pressure Engagement 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
- P2873 is set when clutch B is applied with more pressure than planned while it engages. In dual-clutch designs clutch B usually carries the even gears and reverse, as in Ford's DPS6 and GM's Corvette unit, so the fault tends to surface as jerky shifts into second, fourth or reverse and a hard bite when manoeuvring. Manufacturer documentation for P2873 is not public. CARB 13 CCR 1968.2 calls for functional checks of transmission controls; in GM's 2023 Corvette table the comparable high-pressure check of clutch 2 appears under P2856, classed as Type A. Worth checking are a sticking pressure control solenoid for clutch B, line pressure set too high, a sensor that over-reads, or adaptation values that have drifted.
- What you may notice
- Jerky shifts into even gears or reverse
- Hard bite when manoeuvring
- Warning lamp, limp mode possible
- Likely causes
- LikelyClutch B pressure control solenoid sticking high
- PossibleSystem (line) pressure above specification
- PossibleDrifted or reset adaptation values for clutch B
- RareClutch B pressure sensor over-reading
- 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.