Powertrain, generic (extended)

P28E0 Shift Motor Phase U-V-W Circuit Low

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

The shift motor is the three-phase electric motor of an electronic range actuator: in shift-by-wire systems it turns the detent plate and selector shaft between P, R, N and D. A Denso patent describes such a motor whose driver energises the U, V and W phases in turn, with a motor relay in the supply; Hyundai Kefico sells its SBW actuator with a brushless motor. P28E0 reports a phase voltage below what the driver commands, typically a phase lead or winding shorted to ground. No manufacturer documents P28E0 publicly; Hyundai lists the open-circuit sibling P28E2. CARB requires circuit checks on outputs. The controller usually cuts the motor off, so the selected range can no longer be changed and the car may be stuck in P.

Likely causes

Phase lead to the actuator chafed and shorted to ground
Motor winding shorted to the actuator housing (moisture, insulation damage)
Output stage in the shift control unit faulty

Symptoms

  • Shift system warning in the cluster
  • Selected range cannot be changed, vehicle may stay in Park
  • Engine may not start because Park or Neutral is not confirmed

Repair estimate

DifficultyHardWorkshop job
Parts and labour€150–1,500
Time1–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

shift motorshift motor position sensortcm

Related codes

P28E1P28E2P28E3P28E4

References: law.cornell.edu, patents.google.com, hyundai-kefico.com.