Powertrain, generic · Hybrid propulsion

P0A98 Hybrid/EV Battery Pack Cooling Fan 2 Stuck On

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P0A98 reports that battery cooling fan 2 keeps running after the controller has commanded it off; it mirrors P0A83 for fan 1. No manufacturer documents this code publicly. CARB calls for fan outputs to be checked for correct response to commands. GM's published method for fan 1 (sense code P0BC8) flags a fan that still reports more than about 250 rpm after being off for over 20 s; the same logic applies to a second fan. Typical causes are a welded relay, a control wire shorted to supply or fan electronics that ignore the stop command. Cooling is not at risk, but the fan can drain the 12 V battery and is audible after shutdown. Fan 2 circuit codes are P0A96, P0A99 and P0A9A.

Likely causes

Welded fan 2 relay
Fan 2 control wire shorted to supply
Fan 2 internal controller ignores off command

Symptoms

  • Battery fan audible after the vehicle is switched off
  • 12 V battery discharged after parking
  • Hybrid or check engine warning

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–700
Time0.5–3 h

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

Parts involved

hybrid battery cooling fan 2wiring harnessbms

Related codes

P0A83P0A97P0A9AP0A96P0BC1

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