P28CB
Clutch A Motor Position Sensor Circuit/Open
The TCM cannot read a valid signal from the clutch A motor rotor position sensor. Open wiring or sensor failure.
- 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.
- Open in sensor signal wireCommon
- Position sensor failedPossible
- Pin pushed back out of connector bodyLess likely
Parts involved
- Clutch Motor Position Sensor A
- Wiring Harness
- TCM
P28CB 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.