Powertrain
generic / SAE
P28D4
Clutch B Phase U-V-W Circuit/Open
The output stage for the clutch B BLDC motor cannot drive current through at least one of the U/V/W phases. Open wire or open winding.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number8 / D4
Possible causes
- Open phase wire high
- Open motor winding medium
- Pin pushed back out of connector body low
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: 500–2800 €
- Estimated time: 3–10 h
- Component: clutch motor b
- Component: wiring harness
- Component: tcm
- MIL / check engine light
- limp mode possible
Sources
References
sae:J2012