What are the common causes of P28E1?

A short to voltage on a shift motor phase winding. High resistance in the shift motor phase U-V-W wiring. A failed shift motor phase winding. A corroded shift motor connector. A control module driver fault on a shift motor phase.

Read shift motor phase data on a scan tool. Test each shift motor phase winding for resistance. Test the shift motor phase wiring for a short to voltage. Check the shift motor connector pins. Replace the shift motor if a phase winding is faulty. Clear the code and retest.

P28E1

Shift Motor Phase U-V-W Circuit High

System: Transmission (P code)
Lamp: Check Engine Light
Category: Powertrain - Transmission

What it means

P28E1 means Shift Motor Phase U-V-W Circuit High.

Check these first

A short to voltage on a shift motor phase winding
High resistance in the shift motor phase U-V-W wiring
A failed shift motor phase winding
A corroded shift motor connector
A control module driver fault on a shift motor phase

What to do next

Read shift motor phase data on a scan tool
Test each shift motor phase winding for resistance
Test the shift motor phase wiring for a short to voltage
Check the shift motor connector pins
Replace the shift motor if a phase winding is faulty
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.