P0AD2Hybrid/EV Battery Pack Cooling Fan 3 Control Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0AD2 reports that the control signal for battery fan 3 is pulled too low, typically a short to ground on the line between battery controller and blower. Such fans are mostly speed-controlled by a PWM duty cycle, as a Toyota patent on battery fan control explains. No manufacturer publicly documents P0AD2; GM sets the analogous fan 1 code P0A84 when the control voltage stays below 0.257 V with system voltage above 9.1 V, Type B with two trips. The open circuit is P0ACF, a short to voltage P0AD3. CARB requires these electrical checks for battery thermal components. Fan 3 then cannot be driven, and the battery may run warm with limited power.
- What you may notice
- Hybrid or EV system warning light, often with check engine light
- Electric drive power reduced when the battery gets warm
- No fan noise from the battery area when cooling is expected
- Likely causes
- LikelyControl wire chafed through to body ground
- PossibleInternal short in fan 3 motor or its electronics
- PossibleMoisture or spilled liquid in the fan connector
- RareOutput stage in the battery controller 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.