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juergenkrueger1

Lexus UX Fault Memory Lock Active

I'm having a head-scratcher with my 2022 Lexus UX Electric, about 153k km on the clock. I keep getting an error saying "Fault memory lock active". Basically, there's an error stored in the error memory, but I can't seem to clear it. Anyone else run into this?

Summary of the thread

A 2022 Lexus UX Electric with 153,000 km is experiencing a persistent "Fault memory lock active" error that cannot be cleared. This issue may be caused by undervoltage in the car's system, as suggested by a similar experience with another vehicle. The recommended solution is to have the car checked at a workshop, where the problem was diagnosed as a faulty control unit due to undervoltage, and resolved for a cost of 240€.

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4 comment(s)

benjaminschmitz9

Sounds familiar. I had something similar happen with my old Peugeot, although not electric. The error kept popping up, and it turned out to be related to undervoltage somewhere in the car's system. Were you having any other electrical issues before this started?

juergenkrueger1 (community.author)

Undervoltage, huh? That's interesting. I haven't noticed anything else acting weird, but I guess it could be subtle. Did your Peugeot throw any other codes, or was it just the locked memory thing?

benjaminschmitz9

Just the locked memory. It's like the car's computer system was having a brain fart because it wasn't getting enough juice. Best bet is to get it checked out at a workshop, they should be able to diagnose the exact issue. It cost me around 240€ to fix back then.

juergenkrueger1 (community.author)

Thanks for the heads up! I'll take it in and mention the undervoltage thing. Turns out it was a faulty control unit due to undervoltage like you suggested. Cost me 240€, but at least it's sorted!

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LEXUS

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UX