P0AE4: Hybrid/EV Battery Precharge Contactor A Control Circuit/Open
What to do
As P0AD9's logic on the smallest contactor: companion stuck-open codes are the echo. Twelve-volt health, then the coil wiring.
What this code means
The command wire to the precharge contactor has failed open — the coil side, where P0AE1's family watches the outcome, exactly the split P0AD9 describes for the main contactors.
The same reading of companions applies: this code plus a stuck-open code is one fault — the command never arriving — with the control code doing the pointing. Consequence per P0AE3: no precharge, no mains, no wake.
Likely causes
Start here
- Open circuit in control wiring · moderate
- Corroded or loose connector · easy
Less common
- Fault stored in the battery energy control module · specialist
Symptoms
Components involved
Information, not instruction
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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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