P0ADC: Hybrid/EV Battery Positive Contactor Control Circuit High
What to do
Worth prompt attention — the rare version of this fault holds the main contactor closed when the car wants it open.
What this code means
The positive contactor's command circuit reads high — shorted to a supply, which carries this family's one distinctive risk: a coil held energised keeps the contactor closed against commands to open. Investigated promptly for that reason, though the commoner finding is an ordinary wiring fault.
Likely causes
Start here
- Wiring shorted to voltage · moderate
Less common
- Open circuit in control wiring · moderate
- Fault stored in the battery energy control module · 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
Be the first to write this up
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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