Check Engine

[Sam4]

my 2025 GX threw me a couple of codes yesterday - U0129 and U18DC. 'Lost communication w/Brake Module' and 'Battery Post Failure' - anyone else having similar fun? I think I may have seen someone with battery issue in a post, I'm assuming I have a bad (oem) battery...

 

[mshultz]

Check the battery voltage 10 minutes after you shut the engine off. It needs to be a minimum of 12.6 volts.

 

[MelsRegal]

my 2025 GX threw me a couple of codes yesterday - U0129 and U18DC. 'Lost communication w/Brake Module' and 'Battery Post Failure' - anyone else having similar fun? I think I may have seen someone with battery issue in a post, I'm assuming I have a bad (oem) battery...

Have you contacted the dealer for a service appointment?

 

[Sam4]

I stopped at the dealer to see if Service could provide some inside info, but its technician only/appt only. So yes - contacted. Engine light has reset, and I think the ESC is/was the issue, as the stabilitrak sent a service msg at the same time (red lite @ bell on info screen). 100% dry day, no tire spin (note to self)