Powertrain
generic / SAE
P28D9
Clutch B Motor Underspeed
The clutch B actuator motor falls below the calibrated minimum speed for the commanded duty. High mechanical load or supply voltage low.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number8 / D9
Possible causes
- Mechanical load increased (binding) high
- Supply voltage low under load medium
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
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 500–2500 €
- Estimated time: 3–10 h
- Component: clutch motor b
- Component: clutch actuator b
- MIL / check engine light
- limp mode possible
Sources
References
sae:J2012