Powertrain, generic (extended)

P28E8 Shift Motor Position Sensor Circuit High

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Shift control unit software on the 2024-25 Kia EV9 (service action SA594)
Sensor signal shorted to supply or battery voltage
Open or high-resistance sensor ground
Position sensor failed with output stuck high

Symptoms

  • Vehicle cannot be shifted out of Park
  • Shift system warning in the cluster

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–1,200
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

P28E7P28E9P28EA

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