P28E3Shift Motor Phase U-V-W Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P28E3 covers the phase circuits of the shift motor when none of them is clearly open or shorted, yet they do not behave as expected: one phase draws noticeably more or less current than the others, or the current pattern does not match the commutation step. Such an imbalance comes from a phase with raised resistance, a partly shorted winding or a weak switch in the driver, and it shows up as uneven torque. No manufacturer documents P28E3 publicly. A Denso shift range patent describes the motor driver that energises U, V and W according to the rotor position and stops the motor at a target encoder count; Hyundai Kefico builds its SBW actuator around a brushless motor. CARB requires functional checks on outputs. Range changes may be slow, noisy or refused.
- What you may notice
- Shift system warning in the cluster
- Slow or noisy range changes
- Occasional refusal to change range
- Likely causes
- LikelyCorroded or loose contact raising the resistance of one phase
- PossiblePartly shorted turns in a motor winding
- RareDegraded switch in the motor driver
- 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.