P0A98: Hybrid/EV Battery Pack Cooling Fan 2 Stuck On

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.

High severity. Can I keep driving?If the car still runs, drive as little as possible and go to a specialized repair shop. Do not touch the orange cables: they carry high voltage.

Symptoms

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

Most likely causes

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

What to check, in order

Start with the simplest. You can tick off each step.

Read the codes with a hybrid-compatible scanner and write down the freeze frame data
Use the scanner to command the movement and compare the actual position with the requested one.
Make sure the battery cooling air intake is clean
Check the 12 V auxiliary battery, which can also trigger warnings
Leave any high-voltage measurements to a specialized repair shop

Good to know

Repair difficulty: medium
It affects emissions.

What each character of P0A98 means

P: Powertrain: engine and transmission
0: Generic code: same on every make
A: Hybrid or air and fuel
98: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0A98?

If the car still runs, drive as little as possible and go to a specialized repair shop. Do not touch the orange cables: they carry high voltage.

What causes code P0A98?

The most common causes are: welded fan 2 relay; fan 2 control wire shorted to supply; fan 2 internal controller ignores off command.

Related codes

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.