Powertrain
generic / SAE
P28EB
Shift Motor Position Not Learned
The TCM has not learned the end-stop calibration for the shift motor. Gear positions cannot be commanded with full precision until adaptation completes.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number8 / EB
Possible causes
- Adaptation lost after battery disconnect or TCM reset high
- Shift motor replaced without learn procedure medium
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: 400–2200 €
- Estimated time: 2–8 h
- Component: shift motor
- Component: shift motor position sensor
- Component: tcm
- MIL / check engine light
- limp mode possible
Sources
References
sae:J2012