What Does P278F Mean?
The transmission control module has reached the maximum adaptive learning correction for Clutch B. This indicates excessive clutch wear, hydraulic pressure issues, or mechanical problems preventing proper clutch engagement within normal parameters.
Common Causes
40%
Excessive wear on Clutch B friction discs and steel plates
25%
Low transmission fluid level or degraded fluid condition
20%
Faulty Clutch B pressure solenoid or valve body issues
10%
Internal transmission hydraulic leaks affecting Clutch B circuit
5%
Damaged or worn Clutch B piston seals
Diagnostic Steps
1
Step 1: Check transmission fluid level and condition; look for burnt smell, metal particles, or dark discoloration
2
Step 2: Perform pressure test on Clutch B hydraulic circuit using transmission pressure gauge at test port
3
Step 3: Monitor Clutch B adaptive values and pressure solenoid duty cycle with advanced scan tool
4
Step 4: Test Clutch B pressure control solenoid operation and resistance; verify valve body functions properly
5
Step 5: If external tests pass, transmission disassembly required to inspect Clutch B pack wear and internal seals
Estimated Repair Cost
$800 - $3,500
Parts + labor, varies by vehicle and location
The transmission control module has reached the maximum adaptive learning correction for Clutch B. This indicates excessive clutch wear, hydraulic pressure issues, or mechanical problems preventing proper clutch engagement within normal parameters.
The most common cause of P278F (Clutch "B" Adaptive Learning at Limit) is: Excessive wear on Clutch B friction discs and steel plates
Typical repair costs for P278F range from $800 to $3,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may experience harsh shifts, slipping, or inability to engage certain gears. Continued driving may cause complete transmission failure and potential loss of power while driving.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P278F to identify the root cause.
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Quick Info
Category
Powertrain
System
Automatic Transmission
Difficulty
Type
Generic (SAE)
Recommended Tools
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