2020 Silverado Instrument Cluster Flash/Reboot

forest · September 28, 2020

Driving down the road today in 1 week old 2020 Silverado LT 5.3 and the whole instrument cluster flashes like I am starting it up ... ALL the warning lights come on, all needles peg, stays like that for a cpl seconds and then goes away.

Anyone seen anything like this?

Thanks.

forest · September 30, 2020

Realized today that what had hapoened was that the truck lost electrical power causing the instrument cluster to reset as though I was starting it up ... except I was driving down the road at 55 mph ... I am not sure if this has happened before ... I just happened to be looking at instrument cluster ... anyone have any thoughts on this loss of power ... could this be the b+ battery cable to alternator issue or a loose ground screw or a short ... concerns me ... thanks all

bamorris2 · September 30, 2020

There was either a TSB or PI document that GM released regarding some bolts in the engine bay fuse box not being tighter at the factory, causing all kinds of electrical issues. I have no idea if this is related to your issue, but it may be a starting point. Search the forum and you should find it.

forest · October 2, 2020

Thanks for the suggestion ... I found the thread on the fuse bolt torque and tightened mine ... they were all 1/2 turn shy of recommendation. Will keep eye on it.

carortruck · October 25, 2020

Do you have the TSB number

Did the same to my new truck this morning

MontanaSteve · October 28, 2020

On 10/2/2020 at 2:24 AM, forest said:

Thanks for the suggestion ... I found the thread on the fuse bolt torque and tightened mine ... they were all 1/2 turn shy of recommendation. Will keep eye on it.

Forest, did this resolve your problem? Thanks.

forest · October 28, 2020

I believe that it has ... I have no occurences of the power loss since I tightened these down. Are you having this issue?

Jay P · October 29, 2020

Here is the TSB for anyone that needs it.

Jay

BUELLTIN (1).pdf

MontanaSteve · October 29, 2020

2 hours ago, forest said:

I believe that it has ... I have no occurences of the power loss since I tightened these down. Are you having this issue?

My buddy’s 2020 is having the identical symptoms to yours. I’m having a somewhat similar issue in my 2020. Both are currently in with the local dealer. Mine was more transmission-related symptoms - jolting and slamming into a gear while moving. Happened three times, accompanied by “Service Parking Brake,” “Service ESC,” and “Traction Control Off.” It’d be stuck in that gear until restarted. I’m betting my buddy’s rig has the same loose fuse box bolts as yours. Mine could possibly be related. Gonna check this bolts when I get it back, if the dealer doesn’t do it. Thanks for the response. Cheers.

Foxracer107 · July 31, 2024

Mine is doing the same thing as Montana Steve did they figure it out my dealership can’t figure it out after three months they say they need to replace the main harness and that’s a $10000 fix and isn’t under warranty

silveradosid · August 1, 2024

foxracer, first thing is get away from that dealership, there is no 10k harness. would be nice ti know what your truck is. you might have a ground issue that is on the right side behind the wheel liner. i would check that first

Foxracer107 · August 2, 2024

It’s a 2020 Silverado rst 3.0 diesel. The harness they are referring to is the main engine harness and say they have to lift the entire body from the frame to change it out most of the money is for labor they charge 270 per hour