P2D72Battery Charging System Negative Contactor D Stuck Open
- Generic OBD-II code · Powertrain
- How the car detects it
- P2D72 appears when negative charging contactor D will not close, leaving its path without a return lead; even with plus contactor D pulled in, nothing can be charged. No manufacturer documents P2D72 publicly. Detection can work like GM's Volt test P0D09 for plus contactor A, which expects the charger-side voltage to rise once the contactors are commanded on and fails below 10 V. A missing minus pole and a missing plus pole look the same from that voltage, so the module must use the coil drive states to tell P2D72 from P2D6B. CARB does not require faults to be flagged that cannot be told apart from a failing station. Burnt contacts and a weak coil supply are typical. P2D71 is the welded case.
- What you may notice
- Charging in the affected mode never begins
- Station aborts right after plugging in
- Driving unaffected
- Likely causes
- LikelyMinus contactor D does not close mechanically
- PossibleWeak coil supply or poor ground at contactor D
- RareModule software misattributing a station fault
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €150 – €4,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.