OBD-II code · Powertrain (generic, extended)
P28D3 Clutch B Phase U-V-W Circuit High
The output stage for the clutch B BLDC motor reports a high phase voltage on at least one of the U/V/W phases. Short to B+ or interrupted load.
Is it safe to drive with P28D3?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyPhase wire shorted to B+
- PossibleOpen motor winding
- Less likelyConnector pins corroded - high contact resistance
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 B, Wiring Harness, Tcm
Related codes
- P28C5Clutch A Phase U-V-W Circuit High
- P28D0Clutch A Pressure Sensor Circuit Range/Performance
- P28D1Clutch A Motor Driver Current/Temperature Too High
- P28D2Clutch B Phase U-V-W Circuit Low
- P28D4Clutch B Phase U-V-W Circuit/Open
- P28D5Clutch B Phase U-V-W Performance
- P28D6Clutch B Motor Driver Current/Temperature Too High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.