Powertrain, generic · Hybrid propulsion

P0D65 Hybrid/EV Battery Pack Cooling Fan Enable Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0D65 reports a short to ground on the enable output of the battery cooling fan: the line stays low even though the controller is trying to switch the fan on. GM's 2013 eAssist mild hybrid table 13OBDG05C detects it from the output driver's fault flag for the power pack fan, 20 failures in 25 samples at 250 ms, Type B. The later hybrid tables 16OBDG02 to 19OBDG02 test it with the enable commanded on: a voltage under 5.35 V at system voltage above 10.2 V counts, and 16 failures in 20 samples set the code, again Type B with MIL after two trips. A chafed wire touching the body or a shorted input inside the fan are the usual finds. The fan cannot start, so expect higher battery temperatures and possibly reduced electric support. Open circuit is P0D64, short to voltage P0D66.

Likely causes

Enable wire chafed and shorted to body ground
Shorted enable input inside the fan electronics
Moisture or corrosion bridging the enable pin to ground
Enable driver in the battery controller defective

Symptoms

  • Check engine light or hybrid warning after two trips
  • Battery cooling fan never switches on
  • Engine runs more and electric assist drops in hot weather

Repair estimate

DifficultyMediumDIY possible
Parts and labour€30–500
Time0.5–2.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

hv battery cooling fan enablewiring harnessbms

Related codes

P0D64P0D66P0A84P0BC9

References: gsi.ext.gm.com, gsi.ext.gm.com, gsi.ext.gm.com.