Powertrain, generic (extended)

P28E5 Shift Motor Performance

Check engine lightOn
EmissionsNot relevant
Drive cycleRequired
Limp modePossible

P28E5 judges the shift motor by its result: it is driven, but the actuator does not get to the commanded range as expected. Hyundai lists it in bulletin 22-AT-001H for the shift-by-wire Palisade, Santa Fe, Sonata and Tucson (including hybrids) with two failure types: P28E577, commanded position not reached, and P28E592, SBW motor performance. The bulletin tells technicians to watch the motor feedback current in the SCU data while pressing a shift button; a brief current means the SCU drives the actuator, no current points to the SCU or its wiring. It also compares target and actual lever positions to separate actuator from shifter faults. A Denso patent shows the motor being stopped at a target encoder count, which is the check this code relies on.

Likely causes

SBW actuator worn internally or mechanism stiff
Shift control unit or its harness not delivering motor current
Low 12 V supply during the shift
Shift control software needing an update

Symptoms

  • Shifter system malfunction message in the cluster
  • Range not engaged or engaged with delay
  • Wrong gear display

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–1,600
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

P28E3P28E4P28E6P28EAP07E6

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