P2878
Clutch B Disengagement Time Too Fast
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
- Read clutch B pressure and release data on a scan tool
- Check transmission fluid level and condition
- Command the clutch B solenoid and watch release timing
- Inspect the clutch B apply circuit for internal leaks
- Replace the clutch B pack or return spring if wear is found
- Clear the code and retest
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Updated
Generic SAE J2012 definition. Last updated 2026-10-10.