P28EA
Shift Motor Position Sensor Circuit Range/Performance
The shift motor position signal does not correlate with the commanded commutation. Sensor offset or signal integrity degraded.
- 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.
- Sensor mechanically offsetCommon
- Electrical noise on signal linePossible
- Sensor element aged beyond calibration windowLess likely
Parts involved
- Shift Motor
- Shift Motor Position Sensor
- TCM
P28EA 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.