Powertrain, generic (extended)

P2D67 Battery Charging System Negative Contactor C Control Circuit Low

Check engine lightUsually off

EmissionsNot relevant

Drive cycleNot required

Limp modeNo

P2D67 is stored when the drive line of minus charging contactor C sits lower than the module expects, typically because the wire touches ground or the connector has taken in water. No manufacturer documents P2D67 publicly. A separate low check is needed because the usual open-load test misses this fault: GM states in its 2011 Volt table for the minus charge contactor (P0D11) that the test cannot detect a short to ground. CARB, on the other hand, allows opens and shorts on outputs to share one code, so certain systems log this case under P2D65. The effect of the short depends on which coil end is switched: contactor C may remain open, or the output stage protects itself by cutting out. P2D68 is the high case, P2D60 the plus side.

Likely causes

Drive wire chafed against the battery housing or body

Moisture or corrosion in the contactor connector

Shorted turns in the coil of minus contactor C

Symptoms

Charging mode via contactor C refused
Fault more frequent after rain or washing
Charging warning in the cluster

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 neg contactor cwiring harnessbms

References: gsi.ext.gm.com, law.cornell.edu.