Powertrain, generic (extended)

P2D6E Battery Charging System Positive Contactor D Control Circuit Low

Check engine lightUsually off

EmissionsNot relevant

Drive cycleNot required

Limp modeNo

P2D6E is set when the voltage on the coil supply of plus contactor D reads too low, usually a wire touching ground. No manufacturer documents P2D6E publicly. In a layout where the module switches the supply side of the coil, which a GM patent names as one option besides switching the ground side, a ground short means the driver works into a short circuit: the coil gets no usable current, contactor D stays open and the stage may cut out to protect itself. GM's 2016 contactor drive tests (P0D0A/P0D11) note that their open-load logic cannot see a ground fault, so detecting this case takes a dedicated test. Look for rubbed-through insulation and water in plugs. P2D6F is the high case, P2D75 the minus side.

Likely causes

Coil feed wire shorted to ground

Water or corrosion in the connector of contactor D

Shorted coil in plus contactor D

Symptoms

Charging mode via contactor D refused
Fault set as soon as the contactor is commanded
Charging warning shown

Repair estimate

DifficultyShop_onlyWorkshop job

Parts and labour€100–1,500

Time1–5 h

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

Parts involved

bcs pos contactor dwiring harnessbms

References: patents.google.com, gsi.ext.gm.com.