P0A82 serious

Hybrid Battery Pack Cooling Fan 1 Performance/Stuck Off

The P0A82 code means the vehicle's onboard diagnostic system has detected: Hybrid Battery Pack Cooling Fan 1 Performance/Stuck Off. This is a serious severity code.

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Keep driving?: Yes, but fix soon
DIY difficulty: moderate
Estimated cost: $0 - $600 (often just cleaning; fan assembly replacement at the high end)

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Common Symptoms

Check Engine Light on
Battery cooling fan runs weakly, or not at all, when the pack is warm
Hybrid battery temperature climbing higher than normal on a scan tool
Fan audibly running but moving little air

Probable Causes (Ranked by Likelihood)

Cabin-side cooling intake, filter, or fan blades clogged with dust, lint, or pet hair (Toyota T-SB-0098-13) Very High
Cooling duct between the intake and the battery blocked or disconnected High
Cooling fan motor worn and turning below commanded speed High
Water intrusion or debris damage to the blower motor Moderate

Frequently Asked Questions

What does P0A82 mean?

P0A82 means cooling fan 1 for the hybrid battery pack is underperforming or stuck off - the module expected the pack to cool at a certain rate and it did not. Unlike the circuit codes, this one is about the airflow actually delivered.

Can a dirty filter or intake cause P0A82?

Yes, and it is the first thing to check. Air-cooled hybrid packs pull cabin air through an intake, so dust, lint, and pet hair collect there and choke the airflow. Toyota specifies cleaning the HV battery cooling fan every 25,000 miles on severe-usage vehicles for this reason.

Can I keep driving with P0A82?

The car will drive, but the pack is not being cooled properly and heat is what shortens hybrid battery life. Toyota's own bulletins document blocked cooling leading to battery deterioration codes and pack replacement, so treat this as cheap prevention of an expensive failure.

Is P0A82 safe to work on myself?

Cleaning the cabin-side intake screen is generally owner-serviceable and is the highest-value step. Removing the blower assembly or anything inside the battery case is not - that requires hybrid training and HV safety equipment.

Mechanics Guide Step-by-step diagnosis

Step-by-Step Diagnostic Procedure

Command the cooling fan on with a scan tool and confirm it produces real airflow, not just noise - this code is about performance, so a spinning fan does not clear it.
Find and inspect the cabin-side cooling intake. On Prius it draws from near the right rear seat; locations differ by model, so check the owner's manual.
Remove and clean the fan and intake with compressed air or a vacuum. Toyota T-SB-0098-13 warns not to let the fan spin freely while cleaning, which can damage the motor.
Inspect the full duct run between intake and battery for blockage, crushing, or a disconnected joint.
Compare commanded fan speed against measured battery temperatures on a road test to confirm the fix.

Sources 3

This page is built from documented references. Verify against your own service info before repair work.

Commonly Affected Vehicles

2004-2015 Toyota Prius
Toyota Camry Hybrid and Highlander Hybrid
Honda Civic Hybrid and Accord Hybrid
2013-2017 Hino COE hybrid trucks (water intrusion into the blower, Hino 167-B1701-08)

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