P0D10: Battery Charging System Negative Contactor A Stuck Open
What to do
The car will not charge and nothing is left energised, so this is inconvenient rather than dangerous. Worth distinguishing from a Control Pilot fault, which produces the same complaint: if the car does not react to the cable being plugged in at all, look at the pilot first.
What this code means
The negative charging contactor will not close. The charging contactors, and how they differ from the pack's main pair, are at P0D07; why both poles are switched is at P0D0E.
Stuck open is the inconvenient direction and the safe one. The car simply will not charge; nothing is left energised. Worth separating from the pilot faults at P0CF3, which produce the same complaint for a completely different reason — the discriminator is whether the car acknowledges the cable at all.
Likely causes
Start here
- Faulty battery contactor · specialist
- Corroded or loose connector · specialist
Less common
- Blown fuse or failed supply · easy
- Damaged wiring harness · specialist
- Faulty on-board charger · specialist
Symptoms
Components involved
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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Nothing posted about this yet. Whatever you found is worth writing down — even a dead end saves someone the same afternoon.
What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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