P28E9Shift Motor Position Sensor Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Can trigger limp mode
- How the car detects it
- P28E9 is stored when the signal of the shift motor position sensor sits below its valid band. Typical causes are a signal line shorted to ground, a sensor supply that has collapsed, for instance because another sensor on the same feed is shorted, or a failed sensor. No manufacturer documents P28E9 publicly; Kia documents the high counterpart P28E8 on the EV9. In a Denso patent the sensor sits on the detent plate and sends two independent signals, which lets the controller spot a single failed channel; Hyundai's bulletin 22-AT-001H gives the rule of thumb that both position sensor readings sum to about 100 percent, a quick check on the scan tool. Per CARB, inputs like this must be checked for out-of-range values. The actuator usually stays where it is and range changes are blocked.
- What you may notice
- Shift system warning in the cluster
- Range changes blocked or gear display wrong
- Engine or drive system may not start
- Likely causes
- LikelySensor signal wire shorted to ground
- PossibleSensor supply missing or pulled down
- PossiblePosition sensor failed with output stuck low
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.