P0A85Hybrid/EV Battery Pack Cooling Fan 1 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
- The controller detects a short to voltage on the control output of battery cooling fan 1. GM runs the test while the fan is commanded between 11 % and 100 % duty: a circuit voltage above 9 V counts as a failure, and 16 fails in 20 samples set a Type B code with MIL after two trips. GM tables from 2013, 2016, 2018 and 2019 hybrid programs carry it, partly via the output stage status flag. Depending on the circuit, the fan may run constantly at full speed or not respond. The low and open counterparts are P0A84 and P0A81; a fan that keeps running without a circuit fault is P0A83.
- What you may notice
- Check engine or hybrid warning after two trips
- Battery fan runs constantly or not at all
- Possible 12 V battery drain when parked
- Likely causes
- LikelyControl wire shorted to a supply voltage
- PossibleFan control input internally open or shorted to its supply
- RareCorroded connector creating leakage to supply
- 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 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.