Powertrain, generic (extended)

P2874 Clutch B Pressure Disengagement Too High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Clutch B valve not venting pressure on release
Contamination in the valve body from clutch wear
Seized shutdown valve or clutch B actuator

Symptoms

  • Binding or vibration on upshifts from even gears
  • Car pulls in neutral
  • Clutch temperature warning

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

P286CP2873P285AP287AP2856

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