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Dynasty ECU fault memory lock active

I'm experiencing a strange issue with my 2000 Hyundai Dynasty with a gasoline engine. The ECU is showing a 'fault memory lock active' message. The only symptom is that an error is stored, but the car seems to run fine. My OBD2 scanner points to an undervoltage as the likely cause. Has anyone encountered this before? Mileage is at 96329 km.

A 2000 Hyundai Dynasty is experiencing an ECU issue with a 'fault memory lock active' message, although the car runs fine. The OBD2 scanner indicates undervoltage as a potential cause, but the battery and charging system appear normal. A similar case was resolved by clearing the ECU memory and installing new firmware, suggesting this as a potential solution.

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4 comment(s)

Hey, I think I had something similar on my Dynasty a while back. If I remember right, it was a weird ECU fault. Did you check the battery?

Thanks for the reply! Yes, the battery seems fine – voltage is normal when the engine is off and when it's running. The charging system appears to be working correctly too, no significant voltage drops anywhere. Any other ideas?

Yep, sounds just like what I had. I messed with it for a bit and then just took it to a shop. Turns out the ECU was throwing a fit. They cleared the memory and installed new firmware and that fixed it. Cost about 240€.

Thanks for the confirmation. Sounds like I'll be heading to the workshop then. At least I have a better idea of what to expect now.

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HYUNDAI

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DINASTY