P0A83Hybrid/EV Battery Pack Cooling Fan 1 Stuck On
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P0A83 means battery cooling fan 1 keeps turning although the controller has switched it off. No manufacturer publicly documents this exact code. CARB asks for fan outputs to be checked for proper response to commands. GM shows the method under its sense code P0BC8: with the fan off for more than 20 s, a reported speed above 120 rpm counts as a fault. Likely causes are a control wire shorted to supply, a welded fan relay (GM files that as P0BC1) or a fan controller that ignores the command. The pack stays cool, but the fan drains the 12 V battery when parked and stays loud. Do not confuse it with P0A82 (fan too weak or off) or the circuit codes P0A81/P0A84/P0A85.
- What you may notice
- Battery fan heard running with the vehicle off or idle
- Discharged 12 V battery after parking
- Hybrid or check engine warning
- Likely causes
- PossibleFan control wire shorted to supply voltage
- PossibleWelded fan relay keeps power applied
- PossibleFan's internal speed controller ignores off command
- RareBattery control module output stuck active
- 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: €50 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.