OBD-II code · Powertrain (generic, extended)
P28CA Clutch A Motor Underspeed
The clutch A actuator motor falls below the calibrated minimum speed for the commanded duty. High mechanical load or supply voltage low.
Is it safe to drive with P28CA?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyMechanical load increased (binding)
- PossibleSupply voltage low under load
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
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 3–10 h
- Emissions test
- Usually unaffected
- Parts involved
- Clutch Motor A, Clutch Actuator A
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.