P0AB0Hybrid/EV Battery Pack Air Temperature Sensor A Circuit Intermittent/Erratic
- 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
- P0AB0 flags a battery air temperature sensor A signal that jumps faster than real air temperature can change, usually a sign of a loose contact rather than a dead sensor. No manufacturer documents this exact code publicly; GM's two-mode and 2013 tables for sensor A only list the low, high and plausibility codes. GM does describe the method for the analogous cell sensor code P0A9F: the controller adds up the absolute signal changes over a 10-sample window and fails it when the sum exceeds a limit, 4 of 5 windows, Type B. CARB requires hybrid temperature inputs to be checked for such faults. Wiggle-test harness and connector at the inlet duct while watching live data before replacing the sensor.
- What you may notice
- Hybrid warning light that comes and goes
- Inlet air reading jumps in live data
- Battery fan speed changes without obvious reason
- Likely causes
- LikelyLoose or corroded contact at the inlet air sensor connector
- PossibleWire chafed through at the duct, intermittently touching ground
- RareElectrical interference on the sensor line
- 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 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.