P2D73Battery Charging System Negative Contactor D Control Circuit/Open
- Generic OBD-II code · Powertrain
- How the car detects it
- P2D73 concerns the coil drive of negative charging contactor D: commanded and measured state of the line differ, pointing to an open wire, terminal or winding. No manufacturer documents P2D73 publicly. GM's test for the minus charge contactor (P0D11) is the direct analogue. In the 2016 tables it shares one entry with the plus contactor test and adds a current check: under 57 mA with the driver on means open, as does more than 4 V with it off. The 2011 Volt version only looked at the off state, with a 2 V limit. Both need 40 bad samples of 50 and cannot detect a ground short. The return pole of path D stays open. P2D74–P2D76 are the other drive faults, P2D6C the plus side, P2D65 contactor C.
- What you may notice
- Charging mode via contactor D not available
- Code present at every key-on
- Charging fault message
- Likely causes
- LikelyOpen coil drive wire or loose terminal
- PossibleBroken winding in minus contactor D
- RareDefective driver or current sensing in the module
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €100 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.