P0AB1: Hybrid/EV Battery Pack Air Temperature Sensor B Circuit
What to do
As P0AAC — a ducting-mounted sensor with reachable wiring, and one of the range's cheaper fixes.
What this code means
The second air temperature sensor — the exhaust side of the pair P0AAC describes — has failed its circuit checks.
Losing this one costs the differential measurement: the module can still blow air but no longer knows how much heat the air is carrying away, which is the pack's cheapest early-warning of trouble. Same diagnosis as sensor A: ducting-mounted, wiring first.
Likely causes
Start here
- Open circuit in sensor wiring · moderate
- Corroded or loose connector · easy
Less common
- Faulty battery temperature sensor · 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.
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