OBD-II code · Powertrain (generic, extended)
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.
Is it safe to drive with P28E9?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySignal wire shorted to ground
- PossibleInternal sensor short
- 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
- 2–8 h
- Emissions test
- Usually unaffected
- Parts involved
- Shift Motor, Shift Motor Position Sensor, Tcm
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.