P28D5
Clutch B Phase U-V-W Performance
The phase currents of the clutch B BLDC motor do not match the commanded commutation pattern within tolerance. Sensor or driver synchronisation off.
- 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.
- Rotor position sensor offsetCommon
- Phase current imbalancePossible
Parts involved
- Clutch Motor B
- Wiring Harness
- TCM
P28D5 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.