Powertrain, generic · Hybrid propulsion

P0AD1 Hybrid/EV Battery Pack Cooling Fan 3 Stuck On

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P0AD1 is the counterpart to P0AD0: fan 3 of the traction battery keeps turning although the controller has switched it off or commanded a lower level. A speed feedback or the current in the fan circuit shows that the blower still runs. CARB 1968.2 requires the battery thermal management outputs to be checked for proper response to commands. No manufacturer publicly documents P0AD1; for fan 1 GM treats an unwanted speed above about 250 rpm with the fan off under its own code P0BC8. Typical causes are a driver stage stuck on or a short to supply voltage. Effects are an audible fan after shutdown and possible 12 V battery drain rather than a drivability problem.

Likely causes

Fan output stage in battery controller or fan module stuck on
Control wire chafed against a supply voltage
Fan relay contacts welded (relay-switched designs)

Symptoms

  • Battery fan audible after the vehicle is switched off
  • 12 V battery discharged after standing
  • Hybrid or EV warning light

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€60–500
Time0.5–2.5 h

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

Parts involved

hv battery cooling fan 3wiring harnessbms

Related codes

P0AD0P0AD3P0A83P0A98P0BC8

References: law.cornell.edu, gsi.ext.gm.com, patents.google.com.