P0AD3Hybrid/EV Battery Pack Cooling Fan 3 Control Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- With P0AD3 the battery controller finds the control line of cooling fan 3 at a voltage that is too high for the commanded state, pointing to a short to a supply voltage or a fan input that no longer pulls the line down. No manufacturer publicly documents this code; GM's analogous fan 1 code P0A85 trips when the control voltage exceeds 9 V while the fan is driven, Type B. Siblings: P0AD2 for the low side, P0ACF for an open line, P0AD1 if the fan keeps running. CARB 1968.2 calls for this circuit monitoring on battery thermal management parts. Depending on the fault the fan runs permanently or not at all, and the pack may be derated.
- What you may notice
- Hybrid or EV system warning light
- Fan 3 runs constantly or not at all
- Reduced electric power when the battery is warm
- Likely causes
- LikelyControl wire shorted to 12 V or another supply
- PossibleFan electronics no longer loading the control line
- PossibleBent or bridged pins in the fan connector
- RareBattery controller output stage defective
- 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.