P28E1Shift Motor Phase U-V-W Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Can trigger limp mode
- How the car detects it
- P28E1 is the opposite of P28E0: on any of the three shift motor phases the controller sees a voltage that is higher than the switching state allows, for example while the low-side switch should pull it down. Likely reasons are a phase lead touching a battery-powered wire, a winding with an internal short to a live part, or a high-side switch in the driver that no longer turns off. No manufacturer documents P28E1 publicly. The hardware is the same as described in a Denso shift range patent, where a motor driver feeds the U, V and W phases and a relay can disconnect the motor, and in Hyundai Kefico's brushless SBW actuator. CARB requires circuit checks on outputs. With a phase held high the motor cannot be commutated, so range changes stop.
- What you may notice
- Shift system warning in the cluster
- No response to the gear selector
- Vehicle may remain in Park
- Likely causes
- LikelyPhase lead shorted to a battery-voltage wire in the harness
- PossibleHigh-side switch in the shift control unit stuck on
- RareWater or corrosion bridging pins in the actuator connector
- Repair
- Hard · Usually a job for a workshop.Typical cost: €150 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.