P0AB3Hybrid/EV Battery Pack Air Temperature Sensor B Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P0AB3 means the signal of air temperature sensor B sits below its valid range. Because the sensor is an NTC thermistor, a low voltage translates into very hot air, so a short to ground is the usual cause. GM documents the code for the outlet air sensor of its full-size two-mode hybrids: in the 2011 and 2013 tables it fails when the outlet reading exceeds 95 °C in 30 of 40 samples while at least one module sensor still reads below 70 °C, Type B, two trips. That extra condition separates a real overheat from a wiring fault. The controller may then run the fan at full speed and cut battery power without need. The open-circuit counterpart is P0AB4.
- What you may notice
- Check engine or hybrid warning light
- Battery fan runs loud even when the pack is cool
- Reduced electric assist and regeneration
- Likely causes
- LikelySensor B signal wire shorted to ground
- PossibleThermistor shorted internally
- RareMoisture or debris bridging the connector pins
- 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 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.