P0AB4: Hybrid/EV Battery Pack Air Temperature Sensor B Circuit High
What to do
As P0AAF's mirror — a fan working against heat that is not there usually means a broken wire on this sensor.
What this code means
The exhaust air sensor's circuit reads at the top of its range — a reading the module may take for a pack shedding enormous heat, answering with a hard-running fan. Electrical first, per P0AB1.
Likely causes
Start here
- Open circuit in sensor wiring · moderate
- Corroded or loose connector · easy
Less common
- Wiring shorted to voltage · moderate
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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