Powertrain, generic (extended)

P2873 Clutch B Pressure Engagement Too High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Clutch B pressure control solenoid sticking high
System (line) pressure above specification
Drifted or reset adaptation values for clutch B
Clutch B pressure sensor over-reading

Symptoms

  • Jerky shifts into even gears or reverse
  • Hard bite when manoeuvring
  • Warning lamp, limp mode possible

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–3,500
Time0.5–8 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

clutch bclutch actuator bpressure regulator

Related codes

P286BP2874P2858P2856P2876

References: law.cornell.edu, gsi.ext.gm.com.