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Hybrid system warning and reduced EV performance on the Toyota Auris Hybrid. The NiMH traction battery is cooled by cabin air drawn through a duct behind the rear seat backrest. If this duct becomes blocked by debris or the fan fails, the battery overheats and reduces its output. Clean the battery cooling duct and intake grille behind the rear seat. The cooling fan can be tested by holding your hand near the intake — you should feel airflow when the hybrid system is active.
Based on 59 driver confirmations
No commonly reported misdiagnoses for this fault yet. If you have replaced a part that did not fix this Toyota Auris 2014 problem, submit a wrong diagnosis report — it helps other drivers avoid the same costly mistake.
Dealer diagnosed failed traction battery cells causing overheating. Replaced with remanufactured unit. Very expensive fix but only needed after the cooling fan and duct cleaning had already been tried without success. Most owners should try the cheaper fixes first.
Parts replaced: Remanufactured NiMH traction battery
After cleaning the duct made no difference, tested the cooling fan by listening for it when the hybrid system was active — it was silent. Replaced the battery cooling fan assembly. Toyota part number 87103-47010. Fan is located under the rear parcel shelf. Job took about 2 hours. Warning light cleared immediately.
Parts replaced: Battery cooling fan assembly (Toyota 87103-47010)
Removed the rear seat backrest and vacuumed out the battery cooling duct intake grille. Heavy accumulation of dust, pet hair and debris was blocking airflow. After cleaning, the hybrid warning light cleared within 2 drive cycles and battery performance returned to normal. This is the first thing to try — free fix that works in majority of cases.
Parts replaced: None — cleaning only
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