P0D07: Battery Charging System Positive Contactor A Circuit
What to do
As P0D07. These are the charging contactors rather than the pack's main pair, so a car with this fault may drive perfectly and simply refuse to charge. High-voltage work throughout.
What this code means
The monitoring circuit for the positive charging contactor is faulty.
A charging system has contactors of its own, and that is the first thing to get straight — they are not the pack's main contactors, which are at P0AA0 and its neighbours. The main pair connects the battery to the drive system. This pair connects it to the charger. A car can therefore drive perfectly and be unable to charge, or charge perfectly and refuse to drive, and which contactors are named tells you which.
Why both poles are switched is the part worth carrying, and it is at P0D0E.
Everything else about contactors — why they weld, why precharge exists to stop them welding, and why a welded one is a safety matter rather than an inconvenience — is written at P0C77 and in the welded-battery-contactor cause. It applies here unchanged.
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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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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