P0AD1Hybrid/EV Battery Pack Cooling Fan 3 Stuck On
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P0AD1 is the counterpart to P0AD0: fan 3 of the traction battery keeps turning although the controller has switched it off or commanded a lower level. A speed feedback or the current in the fan circuit shows that the blower still runs. CARB 1968.2 requires the battery thermal management outputs to be checked for proper response to commands. No manufacturer publicly documents P0AD1; for fan 1 GM treats an unwanted speed above about 250 rpm with the fan off under its own code P0BC8. Typical causes are a driver stage stuck on or a short to supply voltage. Effects are an audible fan after shutdown and possible 12 V battery drain rather than a drivability problem.
- What you may notice
- Battery fan audible after the vehicle is switched off
- 12 V battery discharged after standing
- Hybrid or EV warning light
- Likely causes
- LikelyFan output stage in battery controller or fan module stuck on
- PossibleControl wire chafed against a supply voltage
- RareFan relay contacts welded (relay-switched designs)
- 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: €60 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.