Powertrain, generic (extended)

P2D65 Battery Charging System Negative Contactor C Control Circuit/Open

Check engine lightUsually off

EmissionsNot relevant

Drive cycleNot required

Limp modeNo

P2D65 concerns the line that drives the coil of minus-side charging contactor C: the module notices that what it commands and what the line actually shows do not match, which usually means a broken wire, a loose terminal or an open coil. No manufacturer documents P2D65 publicly. The closest published test is GM's P0D11 for the minus charge contactor of the 2011 Volt: with the output off, more than 2 V on it counts as an open load, and the code needs 40 bad samples out of 50 taken every 12.5 ms (one trip, Type A); a short to ground stays invisible to that check. P2D5E is the plus-side twin, P2D73 the same fault on contactor D. The return pole of path C cannot be closed, so that charging mode drops out.

Likely causes

Broken coil-drive wire or terminal pushed out of the connector

Open winding in the coil of minus contactor C

Faulty output stage in the controlling module

Symptoms

The charging mode routed through contactor C does not start
Code is stored even without a charging request
Charging fault message 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, gsi.ext.gm.com, law.cornell.edu.