OBD Codes List

Diagnostic reference · P278F

P278F

Clutch B Adaptive Learning at Limit

System
Transmission (P code)
Lamp
Check Engine Light
Category
Powertrain - Transmission

What it means

P278F means Clutch B Adaptive Learning at Limit.

Check these first

  • A worn clutch B pack at the end of its adaptive range
  • A sticking clutch B actuator unable to relearn
  • A software calibration that has reached its adapt limit
  • Low transmission fluid affecting clutch B response

What to do next

  1. Read the clutch B adapt values on a scan tool
  2. Check transmission fluid level and condition
  3. Perform an adaptive learning reset
  4. Drive a relearn cycle and watch the clutch B adapt values
  5. Replace the worn clutch B pack if adapt returns to the limit
  6. Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.