Powertrain
generic / SAE
P28E9
Shift Motor Position Sensor Circuit Low
Voltage on the shift motor position sensor signal line is below the expected window. Wire shorted to ground or sensor short.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number8 / E9
Possible causes
- Signal wire shorted to ground high
- Internal sensor short medium
- Connector pins corroded - high contact resistance low
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