Powertrain, generic (extended)

P2855 Clutch A Pressure Charge Performance

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2855 points the other way from P2853: clutch A carries more pressure than the model calls for. GM's Corvette table for clutch 1 uses three paths, all Type A. The measured pressure sits above the model by more than a set difference long enough to be confirmed; the absolute gap grows too large with the reading on the high side; or, while the idle clutch is being held at its hold pressure, where it should pass no torque, the reading climbs more than about 1.2 bar above that level for 300 ms. GM calls this a pressure charge fault and requests the odd clutch recovery. Ford's 2024 TR9070 summary sets P2855 when odd clutch pressure exceeds target. Excess pressure makes the clutch drag or grab, giving harsh launches and possible binding.

Likely causes

Clutch A pressure control valve sticking toward high output
Excessive line pressure feeding the clutch circuit
Clutch adaptation values out of date after repair

Symptoms

  • Harsh engagement or jerky creep from standstill
  • Drag felt as if the brakes were applied
  • Limp-home mode with warning lamp

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 aclutch actuator atransmission fluid

Related codes

P2856P2853P2859P0869P0841

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