Every service light on

[Djb4704]

Hello all,

I have a 2018 Yukon Denali with right at 68,000 miles. It has ran like a dream up until today.
When I got in to start it this evening every service light came on, all the way from the trailer brake to the Stabilitrak and ABS light. The fuel gage is also staying on E at startup and it doesn't show any range. (I filled up yesterday so i know it's full)

Has anyone encountered this before? Or are there any simple things I can try before having it hauled into the dealer.

Any and all advice is greatly appreciated!

 

[George100]

Have you tried to start the vehicle since this happened? Because of the electronics in these vehicles, maybe your LanBus got crossed up. I have lost my dash a couple of times in the last 4 years and each time i just restarted the vehicle and all is good. For you it may be that simple. The other thing is check your battery, the batteries do not last a long time in these vehicles and a weak battery wreaks havoc on electronic systems even if the start is good.

 

[Bill 1960]

Low voltage can cause many fault codes. Probably a bad battery.

 

[Djb4704]

Have you tried to start the vehicle since this happened? Because of the electronics in these vehicles, maybe your LanBus got crossed up. I have lost my dash a couple of times in the last 4 years and each time i just restarted the vehicle and all is good. For you it may be that simple. The other thing is check your battery, the batteries do not last a long time in these vehicles and a weak battery wreaks havoc on electronic systems even if the start is good.

Thanks for the advice, i have tried to start it a few times since the incident with the same result. I'll take your advice and try replacing the battery to see if that takes care of it, it's about due for a new one anyways.

 

[Fless]

Take a good look at the condition of the main cables, too, while you're at the battery terminals. Also main grounds between body/chassis/engine.

 

[OR VietVet]

Two things to consider:

https://www.fixmyoldride.com/Chevro...e7e5cd24ed24635&at_ab=per-2&at_pos=3&at_tot=4

https://www.tahoeyukonforum.com/threads/another-big-3-upgrade-with-questions.111196/

https://www.gmfullsize.com/threads/... 3" upgrade is,for the battery and alternator

 

[Doubeleive]

disconnect the battery, clean the grounds and clean the grounds under the body on both sides near the firewall there is one on each side that get all gunked up with road grime, there kind of hard to get clean I would use a spackling tool and sandpaper so you get it down to bare metal.

 

[Joseph Garcia]

Welcome to the Forum from NH.

Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.

I hope that you will become a participating member in the Forum's discussions.

You are already receiving sage advice form the knowledgeable folks on this Forum.

 

[freods]

I was told by a tech that when the Trailer Brake Service memo comes up in the DIC that the battery is low and needs replaced.

 

[OR VietVet]

ALL GOOD steps to inspect for electrical "gremlins" start with a thorough inspection of the battery and it's connections.

 

[Djb4704]

Thank you all for the advice! I haven’t had a chance to get out and handle it myself due to just having surgery and my right hand is out of pocket at the moment too. I just wanted to maybe clarify that the car does start and is drive-able I just get every warning it can possibly display at start up along with no fuel gage reading. Are we all still leaning towards a bad battery?