Powertrain, generic (extended)

P2D6B Battery Charging System Positive Contactor D Stuck Open

Check engine lightUsually off

EmissionsNot relevant

Drive cycleNot required

Limp modeNo

P2D6B is logged when positive charging contactor D fails to close on command, leaving the plus pole of its charging path disconnected. No manufacturer documents P2D6B publicly. GM's Volt test for plus contactor A (P0D09) shows the usual principle: once charging and precharge are commanded on, the charger-side voltage has to climb, and the test fails when 8 of 9 samples, taken every 12.5 ms, stay below 10 V (Type A). The tricky part is attribution. CARB exempts failures that look identical whether the vehicle or the charging station is at fault, so the code is meant for faults that clearly lie inside the vehicle. Typical finds are pitted contacts, low coil voltage or a stuck armature. P2D6A is the welded case, P2D72 the minus side.

Likely causes

Burnt contacts or jammed armature in plus contactor D

Insufficient coil supply voltage or poor ground

Module software misjudging the voltage rise

Symptoms

Charging in the affected mode never starts
Charging station reports an immediate abort
Driving unaffected

Repair estimate

DifficultyShop_onlyWorkshop job

Parts and labour€150–4,000

Time1–10 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, law.cornell.edu.