Powertrain, generic (extended)

P2D6F Battery Charging System Positive Contactor D Control Circuit High

Check engine lightUsually off

EmissionsNot relevant

Drive cycleNot required

Limp modeNo

P2D6F says the supply wire to the coil of plus contactor D sits above its commanded level. No manufacturer documents P2D6F publicly. GM's 2016 drive test for plus contactor A (P0D0A) treats an idle output within 0.4 V of the supply voltage as shorted to power. Where the coil is switched on its supply side, one of the two layouts a GM patent describes, such a short energises the coil with no command, so plus contactor D may close and put the plus pole of its path, up to the inlet, on battery potential. Modules therefore lock charging when they see this code. Causes are a wire chafed against a 12 V line, swapped wires or a driver that stays on. P2D6E is the low case, P2D76 the minus side.

Likely causes

Coil feed shorted to a 12 V supply

Output stage stuck switched on

Wires swapped after a repair

Symptoms

Charging locked
Contactor clicks unexpectedly with ignition on
High-voltage warning possible

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