P0D66Hybrid/EV Battery Pack Cooling Fan Enable 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
- P0D66 stands for a short to voltage on the enable output of the battery cooling fan. Because the line is pulled high from outside, the fan may run although the controller wants it off, or the controller simply loses authority over it. GM's 2013 eAssist table 13OBDG05C flags it through the output driver's fault status, 20 failures in 25 samples at 250 ms, Type B. In the hybrid tables 16OBDG02 to 19OBDG02 the check runs with the enable commanded off: 5.27 to 19.7 V on the output at system voltage above 10.2 V counts as a failure, 16 in 20 samples set the code, Type B, MIL after two trips. Look for the enable wire rubbing against a supply wire or water in the connector. A fan that never stops drains the 12 V battery. Open circuit is P0D64, short to ground P0D65.
- What you may notice
- Check engine light or hybrid warning after two trips
- Battery cooling fan runs continuously, even with the vehicle off
- Discharged 12 V battery after standing
- Likely causes
- LikelyEnable wire rubbed through and touching a 12 V supply wire
- PossibleMoisture in the fan connector bridging enable and supply pins
- RareInternal fault in the fan electronics feeding voltage back onto the enable line
- RareEnable driver 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 · Often possible to do yourself.Typical cost: €30 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.