P28E8Shift Motor Position Sensor Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Can trigger limp mode
- How the car detects it
- P28E8 means the shift motor position sensor reports a value above its permitted range. Kia documents it on the 2024-25 EV9: service action SA594 (bulletin ELE362, January 2025) covers cars built from 25 September 2023 to 4 September 2024 that may not leave Park while P28E812 is stored, which Kia attributes to an output shaft sensor reading above what it should be. The fix is new software for the shift control unit, event 787, an improvement of the fault judgment logic, also offered over the air. Outside that campaign the usual causes apply: a signal line shorted to a supply, an open sensor ground or a failed sensor. A Denso patent describes such output shaft sensors with two independent channels. CARB requires out-of-range checks on inputs. P28E9 is the low fault.
- What you may notice
- Vehicle cannot be shifted out of Park
- Shift system warning in the cluster
- Likely causes
- LikelyShift control unit software on the 2024-25 Kia EV9 (service action SA594)
- PossibleSensor signal shorted to supply or battery voltage
- PossibleOpen or high-resistance sensor ground
- RarePosition sensor failed with output stuck high
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.