Hilux auxiliary battery malfunction

I'm experiencing an odd issue with my 2019 Toyota Hilux with a gasoline engine. At 65000 km, I'm getting auxiliary battery malfunction errors. Symptoms include an error message on the speedometer, a stored error in the memory, weak starts, and general electrical weirdness. I suspect it's not charging properly, but haven't pinpointed the root cause. Has anyone encountered similar problems?

4 comment(s)

Interesting. I have a Hilux as well, but I also had a similar issue with electrical problems a while back. Could you be more specific about "general electrical weirdness"? What exactly is happening?

Thanks for the quick response. By 'general electrical weirdness,' I mean seemingly random voltage drops. The interior lights will sometimes dim, and I once had the infotainment system reboot itself while driving. Also, the error messages seem intermittent. Do these problems sound familiar?

Yes, those issues definitely sound similar to what I experienced. Considering that, and given your technical skills, I would advise you to visit a workshop and have the auxiliary battery and related components checked. Especially the charging circuit.

Appreciate the insight. I followed your advice and took it to a workshop. Turns out the auxiliary battery wasn't charging correctly. The repair, including a new battery and diagnostics, came to around 290€. Thanks again for confirming my suspicions!

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