“Service transmission Now, unable to shift soon” message on 2021 Tahoe

[West1]

That is garbage.
All the modules store history codes..they could at least look.
Next time take a picture or a video of the code on the screen...harder to argue w/ evidence.
These dealers are really starting to tick me off...

I did take a picture and a video.
This morning it happened again and I drove to the dealer and kept the engine running. They scanned it and said there’s a ton of codes popping up with a low battery voltage. They said start with replacing the battery and go from there.

I also asked if I could swap the battery myself (since not a lot of people on the forum know the solid answer) and they said yes, no problem swapping batteries.

Off to buy a battery…

 

[WalleyeMikeIII]

I did take a picture and a video.
This morning it happened again and I drove to the dealer and kept the engine running. They scanned it and said there’s a ton of codes popping up with a low battery voltage. They said start with replacing the battery and go from there.

I also asked if I could swap the battery myself (since not a lot of people on the forum know the solid answer) and they said yes, no problem swapping batteries.

Off to buy a battery…

FYI, Low Voltage has also been caused in GM vehicles by corroded frame ground wires...so, make sure you/they inspect those bonding braids. (I will never understand why GM thought bare copper braid for frame ground in a corrosive environment was a good idea). This video is worth a watch.

 

[Fless]

FYI, Low Voltage has also been caused in GM vehicles by corroded frame ground wires...so, make sure you/they inspect those bonding braids. (I will never understand why GM thought bare copper braid for frame ground in a corrosive environment was a good idea). This video is worth a watch.

After having watched that video a few weeks ago, I wondered if the SUVs have that same ground cable.