Hybrid Battery Pack Cooling Fan 2 Performance/Stuck Off
The P0A97 code means the vehicle's onboard diagnostic system has detected: Hybrid Battery Pack Cooling Fan 2 Performance/Stuck Off. This is a serious severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- moderate
- Estimated cost
- $0 - $600 (often just cleaning; fan assembly replacement at the high end)
Best-selling code reader on Amazon. Reads and clears check engine codes on any 1996+ vehicle. Under $30.
Essential for diagnosing sensor codes, checking voltage, and testing circuits. Under $15 and pays for itself on the first job.
Affiliate links — we earn a commission at no extra cost to you.
Common Symptoms
- Check Engine Light on
- Fan runs weakly or moves little air despite being commanded
- Pack temperatures climbing higher than normal on a scan tool
- Fan audible but airflow at the intake feeble
Probable Causes (Ranked by Likelihood)
- Cooling intake, filter, or fan blades clogged with dust, lint, or pet hair (Toyota T-SB-0098-13) Very High
- Cooling duct blocked, crushed, or disconnected High
- Worn fan motor turning below commanded speed High
- Water intrusion or debris damage to the blower Moderate
Frequently Asked Questions
What does P0A97 mean?
P0A97 means the Hybrid Battery Pack Cooling Fan 2 is underperforming or stuck off - the pack is not cooling at the rate the module expects for the fan speed commanded.
Can I keep driving with P0A97?
The car drives, but the pack is running hot. Toyota specifies cleaning this fan every 25,000 miles on severe-usage vehicles because debris buildup progresses to battery deterioration codes and pack replacement. Clean it now; it may cost nothing.
Is P0A97 safe to work on myself?
Cleaning the cabin-side battery cooling intake is generally owner-serviceable. Anything beyond that: This code involves the high-voltage system. Do not open the HV battery, inverter, or any orange-cabled component without hybrid-specific training, insulated gloves, and the service plug removed. Diagnosis beyond a scan-tool read belongs at a hybrid-qualified shop.
Mechanics Guide Step-by-step diagnosis
Step-by-Step Diagnostic Procedure
-
Command the fan and verify real airflow, not just noise - this is a performance code, so a spinning fan does not clear it.
-
Find and inspect the cabin-side cooling intake; clean it and the fan with compressed air or a vacuum.
-
Do not let the fan spin freely while cleaning - Toyota warns this damages the motor.
-
Inspect the full duct run between intake and battery.
-
Compare commanded fan speed against pack temperatures on a road test to confirm the fix.
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- Toyota T-SB-0098-13 (Aug 12, 2013), 'HV Battery Cooling Fan Maintenance for Severe Usage Vehicles' - dust, lint and debris buildup reduces HV battery cooling efficiency; cleaning specified every 25,000 miles on severe-usage vehicles.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
Commonly Affected Vehicles
- Toyota Prius and other Toyota/Lexus hybrids
- 2005-2012 Ford Escape Hybrid / Mercury Mariner Hybrid
- Honda Insight and Civic Hybrid
- Hyundai Sonata Hybrid / Kia Niro Hybrid
Related Codes
Explore More
Was this helpful?
Send this to whoever is fixing the car — your mechanic, or the person asking what the light means.