gds2/mdi reoccurring codes communication errors ebcm/radio HELP

[doubeleive]

I have some questions regarding can bus errors that keep popping up and communication errors
if anyone is interested I am trying to narrow the problem down to either the BCM or can-bus communications or both.
on my 2018 Silverado I get
radio codes only no HMI codes
u0028 most bus
u0140 lost communication with bcm
u0164 lost communication hvac
b1325 high voltage
ebcm codes
u0126 lost communication steering wheel angle sensor
u0151 lost communication inflatable restraint system
u0077 control module communication can-bus
I can clear all the codes from history, sit there and scan it on the same session and get no codes
drive it a little bit turn it on /off scan again
little by little within a few minutes the codes creep back one or two at time
all will come up as either history or passed and failed
no open code
on different sessions I loose complete communication with radio and most of the modules, while those communications are down the ebcm is flagged and serial data gateway module is flagged, hmi is green, bcm is green and power steering control & transfer case module is green

the dealer is hesitant to do anything because i have aftermarket equipment installed such as a alarm system, hid lights, led lights

here are a couple photo's showing how I get intermittent communication, works and then it doesn't work

vehicle has no cel, drives and runs great, radio gives me intermittent problems, but these other codes are unrelated and should not even be coming up

[doubeleive]

[Snowcamo]

What alarm do you have installed?

[Jsdirt]

No dealers for that stuff. You need a shop that specializes in this, or a mobile electronics troubleshooter / programmer (reflasher), or spend some time yourself looking over harnesses.

 

When I get a vehicle with a bunch of codes like that, regardless of what systems are affected, I do a visual inspection of the wiring near any common failures. Many times I'll find rubbed-through shorted wiring, a green crusty connection, or something else that's out of place. If that all checks out, then I'd be focusing on the alarm system. Some installers are HACKS. 9 times out of 10, the problem is related to the installation.

[Doug_Scott]

If you are thinking it is more likely not anything related to the aftermarket stuff, go to your installer and have them remove all the connections they made to install the various items.  If the error is still there, then go back to the dealer(assuming it is under warranty) and have them call in their service people.  Don't know about the states, but in Canada dealers do not do entertainment repairs themselves.  They call in a service company that they have been using for decades likely and have them repair it.  Back in 97 when I factory ordered my 98 Pontiac Grand Prix GTP, it arrived without the 6 CD changer in the trunk.  It did have the main harness wire there, cut off.  The dealer called in their repair company to run the harness into the trunk and bolt the cd changer back in place.  I had to wait an additional 4 days because the stereo guy was busy.  I have no idea why it required the stereo guy, this was simple parts install.  Point is dealers don't do anything they can farm out and make an easy 10 to 25% on it.  Back in 81 I had to repair 2 Plymouth Sapporo's that our outside stereo guy did the install wrong on them.  Father/daughter bought identical cars, except colour and had expensive aftermarket stereos put in.  Took me 4 hours on the first car to find that the installer tapped into what he thought was the power feed for the dash lights.  Sapporos as I came to discover, didn't put the rheostat on the power side of the bulbs, they put it on the ground side.  You had to see the effect of a variable ground on a power wire to a stereo.  Service manager told me to bill 4 hours on the second car even though I fixed it outside without even sitting in it.