Powertrain, generic (extended)

P28D6 Clutch B Motor Driver Current/Temperature Too High

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

P28D6 tells that the electronic switch stage powering the clutch B motor has hit its overcurrent or overtemperature protection. Normally these pump actuators draw very little; Getrag quotes roughly 31 W (NEDC) and 33 W (WLTC) for the complete 7DCT300 actuation, so a stage running into its limits indicates the motor is working against unusual resistance or a fault in the stage itself. Candidates include a pump seized by particles, which Stellantis reports for the 7HDT300 actuator under P28D5, a shorted motor winding, or long stretches of high clamping demand while the clutch is already hot, as P27F3 would show. Wiring faults on the phases fall under P28D2-P28D4; the clutch A counterpart is P28D1. Limits are not public.

Likely causes

Clutch B pump seized by particles, motor stalls and draws excess current

Turn-to-turn short in the clutch B motor winding

Prolonged high pressure demand with hot clutch, e.g. stop-and-go or towing

Defective output stage or poor heat transfer in the controller

Symptoms

Clutch B shut down temporarily, may recover after cooling
Transmission warning and restricted gears
May appear together with P27F3 or P28D5

Repair estimate

DifficultyHardWorkshop job

Parts and labour€150–1,800

Time0.5–4 h

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

Parts involved

clutch motor bwiring harnesstcm

Related codes

P28D2 P28D5 P28D9 P27F3 P28D1

References: law.cornell.edu, cti-symposium.world, static.nhtsa.gov.