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juergenscholz1

Ioniq 5 rear window heating issue

Ioniq 5 (2022, electric) owner here. My rear window heating isn't working. Error stored in error memory, and the windshield heating is also underperforming. Mileage is at 36213 km. Suspect heavily discharged or defective battery. Any ideas?

Summary of the thread

An Ioniq 5 owner reported a rear window heating issue, with an error stored in the error memory and underperforming windshield heating. The problem was suspected to be related to a heavily discharged or defective battery. Another owner with a similar experience suggested that the issue might be linked to insufficient voltage, particularly after a cold snap. The recommended solution was to have the battery checked, which led to the discovery that the battery was indeed the problem, requiring replacement.

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4 comment(s)

sophiakoch3

Sounds familiar! I have an Ioniq 5 as well, and had a similar issue last winter. Rear defrost quit, and it definitely impacted the windshield defrost too. Did you notice if it happened after a particularly cold snap, or after the car sat unused for a while? Almost like the car's shivering in the cold!

juergenscholz1 (community.author)

It did happen after a cold snap, yes. Car was sitting for two days. Was your error memory also showing a fault? How was the car defrost?

sophiakoch3

The error memory definitely showed a fault – something about insufficient voltage. The car defrost was practically useless, like breathing on a mirror and expecting it to clear the whole thing. I'd suggest taking it to a workshop to get the battery checked; it might be the culprit, or at least point you in the right direction.

juergenscholz1 (community.author)

Thanks, that's helpful. Took it to the shop, and you were right – battery was the issue. Replacement cost me 290€. Appreciate the input!

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HYUNDAI

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IONIQ5