OBD Codes List

Diagnostic reference · P2878

P2878

Clutch B Disengagement Time Too Fast

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

What it means

P2878 means Clutch B Disengagement Time Too Fast.

Check these first

  • Low transmission fluid causing a fast drop in clutch B pressure
  • A worn clutch B piston seal leaking apply pressure
  • A leaking clutch B apply circuit inside the transmission
  • A faulty clutch B solenoid releasing too quickly
  • A weak clutch B return spring

What to do next

  1. Read clutch B pressure and release data on a scan tool
  2. Check transmission fluid level and condition
  3. Command the clutch B solenoid and watch release timing
  4. Inspect the clutch B apply circuit for internal leaks
  5. Replace the clutch B pack or return spring if wear is found
  6. Clear the code and retest

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Updated

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