willi_dragon1
Mistra High Voltage System Error
Summary of the thread
A 2021 Hyundai Mistra owner is experiencing a 'High-Voltage System Error' message, reduced power, and engine shutdowns. A mechanic suggested a discharged or defective battery as a potential cause. Another Mistra owner shared a similar experience, suggesting possible issues with the voltage sensor, loose connections, or corroded wiring. The recommendation is to have the vehicle checked by a specialist to diagnose and resolve the issue.
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4 comment(s)
willi_dragon1 (community.author)
Thanks! The voltage sensor is interesting. When you experienced this, were the symptoms exactly the same – the error message AND the power reduction? And did the error appear intermittently, or was it constant? How did you eventually resolve it?
davidmoon1
Yep, the symptoms were almost identical. The error message would pop up randomly, followed by an instant loss of power. Pretty scary when you're overtaking someone! I couldn't find the issue. Eventually, I had to take it to a workshop to get it sorted, so I advise that.
willi_dragon1 (community.author)
I appreciate you sharing your experience. It's helpful to hear from someone who has faced a similar ordeal. I will take your advice and get it checked out by a specialist. Hopefully, it won't be too costly! The first quote I got was 290€.
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HYUNDAI
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MISTRA
davidmoon1
That sounds frustrating! I have a Mistra myself. I actually went through something similar a while back: 'High-Voltage System Error', limp mode kicking in. Did they check the voltage sensor? It might be a loose connection or corroded wiring. Have you noticed anything else unusual, like the battery warning staying on longer, or cable damage under the hood? Could even be an inverter issue, hopefully not!