What are the common causes of P28D3?

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

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

P28D3

Clutch B Motor Phase U-V-W Circuit High

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

What it means

P28D3 means Clutch B Motor Phase U-V-W Circuit High.

Check these first

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

What to do next

Read clutch B motor phase data on a scan tool
Test each clutch B motor phase winding for resistance
Test the clutch B motor phase wiring for a short to voltage
Check the clutch B motor connector pins
Replace the clutch B 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.