P0A84: Hybrid/EV Battery Pack Cooling Fan 1 Control Circuit Low
What to do
Same picture as P0A81: nothing feels different while the pack loses its cooling. Wiring first, and clean the fan while access is open.
What this code means
The battery cooling fan's control circuit reads low — shorted to ground, or open where the resting state reads high.
An electrical diagnosis, as across the circuit half of this family: wiring and connector first, then the fan's own speed controller. The consequence while it is unresolved is P0A81's — a pack running warmer than managed — and the dusty-fan caveat there applies here too.
Likely causes
Start here
- Wiring shorted to ground · moderate
- Faulty hybrid battery cooling fan · moderate
- Corroded or loose connector · easy
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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