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Toyota iQ high voltage error

I'm experiencing a high-voltage system error in my 2014 Toyota iQ electric with 155735 km. Error message stored, engine shuts off sometimes, and power is reduced. Diagnostics point to a heavily discharged or defective battery. Anyone seen similar electrical faults with their iQ?

A 2014 Toyota iQ electric vehicle is experiencing a high-voltage system error, causing the engine to shut off and power to reduce. Diagnostics suggest a heavily discharged or defective battery as the potential cause. A similar issue was resolved by checking the voltage sensor and inspecting for battery drain or electrical wiring damage. A comprehensive diagnostic assessment at a workshop is planned to accurately identify and repair the fault.

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4 comment(s)

I had a similar issue with my iQ. The error message and power loss sound very familiar. Have you checked the voltage sensor or considered a significant battery drain? Inspect the electrical wiring for damage or corrosion.

Thanks. When you mention checking the voltage sensor, where is it in the iQ's electrical system? And did the battery drain manifest in a specific way, like rapid discharge overnight or during inactivity?

In my case, the voltage sensor was accessible after removing the rear seat. I'd suggest caution and consulting the service manual or a qualified technician for precise instructions. The battery drain was quite rapid. The battery warning light came on intermittently, followed by a complete failure. I went to a workshop for further assistance.

Thanks for confirming the similarities. Given the potential complexities, especially with the high-voltage system, I'll arrange for a comprehensive diagnostic assessment at a reputable workshop to pinpoint the fault and perform the necessary repairs. The likely repair costs are estimated at around 290€. Thanks again.

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TOYOTA

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