Hybrid Battery Pack Cooling Fan 2 Stuck On
The P0A98 code indicates that the hybrid battery pack cooling fan 2 is running continuously, even when the vehicle is off or the battery temperature is normal. This can drain the 12V battery and reduce fan lifespan. The fan is controlled by the hybrid battery control module, which monitors temperature and commands the fan on/off. A stuck-on condition may be due to a faulty fan relay, a shorted fan motor, or a control module issue.
01. Most Common Causes
- Faulty cooling fan relay stuck closed
- Shorted fan motor or wiring
- Hybrid battery control module malfunction
02. Symptoms You Will Notice
- Cooling fan runs continuously after key off
- Dead 12V battery after sitting
- Reduced fuel economy
03. Step-by-Step Diagnosis
Step 1: Check for other hybrid battery codes and inspect fan operation with key on/off.
Step 2: Test fan relay and wiring for shorts; replace relay if stuck closed.
Step 3: If relay and wiring are good, test fan motor resistance; replace if shorted.
Step 4: If all pass, suspect control module; reprogram or replace as needed.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended because the continuous fan operation can drain the 12V battery, leaving you stranded. Also, the fan may fail prematurely.
How much does it cost to fix?▼
Typically $50-$150 for a relay or fan replacement. Control module repair can be higher.