Powertrain, generic (extended)

P28E7 Shift Motor Position Sensor Circuit/Open

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

The shift motor position sensor tells the controller where the selector shaft of a shift-by-wire actuator stands. In a Denso patent it is a contactless magnetic sensor on the detent plate with two independent units, so two signals reach the ECU; Hyundai notes in bulletin 22-AT-001H that the readings of its two position sensors should add up to roughly 100 percent. P28E7 marks a broken circuit: no usable signal arrives, typically because the signal, supply or ground lead is interrupted or the plug has been pulled. No manufacturer documents P28E7 itself publicly; Kia uses the High variant P28E8. CARB requires circuit checks on inputs. Without a confirmed position the system cannot verify Park, so it may refuse to shift or to start.

Likely causes

Position sensor connector loose, corroded or unplugged
Signal, supply or ground wire of the sensor broken
Position sensor failed internally

Symptoms

  • Shift system warning in the cluster
  • Gear display missing or wrong
  • Vehicle refuses to shift or does not start

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–1,200
Time0.5–3 h

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

Parts involved

shift motorshift motor position sensortcm

Related codes

P28E8P28E9P28EAP0705

References: law.cornell.edu, patents.google.com, static.nhtsa.gov.