What Does P2855 Mean?
The TCM has detected that clutch A is not building hydraulic pressure as quickly as commanded. This indicates a problem with pressure application affecting clutch engagement and shift timing.
Common Causes
35%
Faulty clutch A apply solenoid or pressure control solenoid malfunction
25%
Internal transmission leak in clutch A circuit reducing pressure buildup
20%
Low transmission fluid level or pump performance issue reducing system pressure
15%
Clogged transmission filter or restricted fluid passages limiting flow
5%
Defective clutch A pressure sensor providing incorrect feedback
Diagnostic Steps
1
Step 1: Monitor clutch A pressure buildup time in scan tool live data during clutch engagement cycles
2
Step 2: Check transmission fluid level and condition; verify pump operation and main line pressure
3
Step 3: Test clutch A apply solenoid using bidirectional controls and verify electrical operation
4
Step 4: Install pressure gauge to clutch A circuit and measure actual charge time versus specification
5
Step 5: Inspect transmission filter for clogging and valve body for wear or debris if external tests pass
Estimated Repair Cost
$800 - $2,500
Parts + labor, varies by vehicle and location
The TCM has detected that clutch A is not building hydraulic pressure as quickly as commanded. This indicates a problem with pressure application affecting clutch engagement and shift timing.
The most common cause of P2855 (Clutch "A" Pressure Charge Performance) is: Faulty clutch A apply solenoid or pressure control solenoid malfunction
Typical repair costs for P2855 range from $800 to $2,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Delayed or slipping shifts may occur creating unpredictable acceleration. Slow clutch apply can cause excessive clutch wear, overheating, and eventual transmission failure if not addressed.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2855 to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission/Drivetrain
Difficulty
Type
Generic (SAE)
Recommended Tools
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