P0AB2Hybrid/EV Battery Pack Air Temperature Sensor B Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P0AB2 checks whether air temperature sensor B reads sensibly. GM uses it on the full-size two-mode hybrids, where sensor B measures outlet air: in the 2011 and 2013 tables, with the battery fan commanded on, the outlet air may not be more than 10 °C warmer than the hottest battery module, 90 of 100 samples, Type B, two trips. The logic is simple physics: air leaving the pack cannot be much hotter than the modules that heated it. The test is skipped while module sensor or fan faults are present. A drifting thermistor, a sensor that has slipped out of the air stream or a faulty module sensor can trigger it. Unlike P0AB3 and P0AB4, the circuit itself is electrically in range.
- What you may notice
- Hybrid or check engine warning light
- Outlet air reads clearly above module temperatures in live data
- Usually no change in driving behavior
- Likely causes
- LikelyOutlet air thermistor drifted from its characteristic
- PossibleSensor displaced from its position in the air duct
- PossibleBattery module temperature sensor used for comparison reads wrong
- RareCorroded contact adding resistance
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.