Lexus UX Error Message and Electrical Issues

My 2021 Lexus UX electric with 149188 km is showing an "Error" message on the speedometer. The error memory is full. It feels like the auxiliary battery is struggling, with weak starts and electrical issues. I suspect the auxiliary battery isn't charging properly. Where do I start tracing a voltage drop in this power management system? Has anyone else experienced this? Are Lexus UX car electronics especially sensitive?

4 comment(s)

I had something similar happen with my UX. Same symptoms: the error message, electrical issues. Sounds like it might be a low voltage problem. Did you check your auxiliary battery?

You experienced the exact same warning lights and electrical issues? How did you determine that it was a low voltage problem, or a battery failure? Did you perform a specific measurement?

Yeah, pretty much the same deal. Honestly, I didn't dive too deep myself. I brought it to a trusted workshop, because I didn't want to mess anything up, and they told me it was the auxiliary battery causing all the chaos.

Okay, that's good to know. I was hoping it wasn't anything too obscure. After some measurements I also came to the conclusion, that the battery is broken. Off to the workshop it is, then! Thanks for confirming my suspicions. The final cost was 290€ for a new auxiliary battery and installation.

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