P2855 code meaning
Clutch A Pressure Charge Performance
Powertrain system Generic code P28xx codes Check engine light
What P2855 means
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.
P2855 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 12 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2855
- Harsh engagement or jerky creep from standstill
- Drag felt as if the brakes were applied
- Limp-home mode with warning lamp
Common causes of P2855
- Most likelyClutch A pressure control valve sticking toward high output
- PossibleExcessive line pressure feeding the clutch circuit
- Less likelyClutch adaptation values out of date after repair
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Clutch aClutch actuator aTransmission fluid
What each part of P2855 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 8 | Area: transmission. |
| 55 | The exact fault in that area. |
What to do next
- Note P2855 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2855
What does P2855 mean?
P2855 means "Clutch A Pressure Charge Performance". P2855 points the other way from P2853: clutch A carries more pressure than the model calls for. It is a generic code, so it means the same on every make.
Is it safe to drive with P2855?
Drive gently and only to a workshop. With P2855 the car can go into limp mode (reduced power) to protect itself.
Will P2855 fail an emissions test?
Yes, it can. P2855 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2855 to fix?
Difficulty: workshop only. A typical repair takes 1 to 12 hours of work. This is a job for a workshop.
Will P2855 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.