P0AAA: Hybrid/EV Battery Voltage Isolation Sensor Circuit High
What to do
As P0AA7.
What this code means
The isolation sensor's circuit reads at the top of its range — the mirror of P0AA9, same verdict: the measuring chain has failed electrically, and the wiring outside the battery module is the reachable half. Family context at P0AA7.
Likely causes
Start here
- Wiring shorted to voltage · moderate
- Open circuit in sensor wiring · 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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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.
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