P286B
Clutch A Pressure Engagement Too High
Clutch A engagement pressure exceeds the calibrated maximum. Risk of harsh engagement and accelerated wear.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: hard
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Common causes
Ordered by how often each turns out to be the cause.
- Pressure regulator stuck at high outputCommon
- Control solenoid characteristic driftPossible
Parts involved
- Clutch A
- Clutch Actuator A
- Pressure Regulator
P286B is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.