Powertrain, generic (extended)

P2854 Clutch B Pressure Discharge Performance

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Clutch B pressure control valve restricted by debris or wear
Seal leak in the clutch B feed or piston
Foamed or overheated fluid lowering effective pressure

Symptoms

  • Even gears skipped, car runs in odd gears only
  • Slipping or flare on shifts into even gears
  • Transmission warning

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€200–4,000
Time1–12 h

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

Parts involved

clutch bclutch actuator btransmission fluid

Related codes

P2853P2856P2858P0849P0868

References: gsi.ext.gm.com, fordservicecontent.com.