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post #16 of (permalink) Old 03-13-2018
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if that still doesnt work, you can get a used mylink screen on ebay for around $200 that probably will be the fix you need (for reference, new the screens are over $1400)

https://www.ebay.com/i/173151064215?chn=ps

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post #17 of (permalink) Old 03-16-2018 Thread Starter
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if that still doesnt work, you can get a used mylink screen on ebay for around $200 that probably will be the fix you need (for reference, new the screens are over $1400)

https://www.ebay.com/i/173151064215?chn=ps
Well, it's no longer in theft mode... I, on a whim, auto started it, to see if I could get the heat working a bit for my drive to work, and when I got it , it started back up perfectly. I'm back to my previous issue, with no sensors and no screen. I've still not pulled the left side sensor cable to see if taking it out of the loop will correct the issue since it's been so cold this week. I did find the diagram for how it's fastened to the car, and it should be simple to remove.

In the meantime, a coworker had an obd2 reader, and pulled the stored codes in my car. Looks like a bunch of bcm issues.

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post #18 of (permalink) Old 03-16-2018 Thread Starter
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Well, it's no longer in theft mode... I, on a whim, auto started it, to see if I could get the heat working a bit for my drive to work, and when I got it , it started back up perfectly. I'm back to my previous issue, with no sensors and no screen. I've still not pulled the left side sensor cable to see if taking it out of the loop will correct the issue since it's been so cold this week. I did find the diagram for how it's fastened to the car, and it should be simple to remove.

In the meantime, a coworker had an obd2 reader, and pulled the stored codes in my car. Looks like a bunch of bcm issues.

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Tire sensors are fine fyi, I just have winter rims on.

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post #19 of (permalink) Old 03-20-2018 Thread Starter
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One clue you have here is that the side blind spot alert fuse was blown. Both side object sensor modules/radars use low speed GM Lan to communicate as well as over 12 different modules in your car and some of them are the radio, the info display, amp, BCM, HVAC, etc. It's pissiable that the side blind zone alert modules are corroded internally and/or the wire harness connectors are corroded/Have water in them and are shorting out the low speed GM Lan. One thing you can check is look inside the rear facia just behind the rear wheels and check both modules for expanding in their brackets and water/corrosion in the wire harness connectors at the modules. The modules should be able to move easily out of there brackets.
The right side module communicates threw the left hand side module. If there is an issue with one of the modules and it is causing your issues you can unplug the left hand side detection module, this will take both modules out of the circuit, and see if things come back.
If unplugging the side blind alert modules doesn't help then you'll have to bite the bullet and take your vehicle into your GM dealer for a better diagnosis.

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Well, I finally got the bumper off, and there is dirt everywhere. I'm currently cleaning out the mess, and taking pictures. The two modules on either side are not budging. I'm about to get a screwdriver to see if I can pry it out. It was just dirty, which is why it was stuck. I don't see any swelling or corrossion, and unplugging the sensor on the left hand side didn't fix the issue

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post #20 of (permalink) Old 03-20-2018 Thread Starter
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Originally Posted by Bart77 View Post
One clue you have here is that the side blind spot alert fuse was blown. Both side object sensor modules/radars use low speed GM Lan to communicate as well as over 12 different modules in your car and some of them are the radio, the info display, amp, BCM, HVAC, etc. It's pissiable that the side blind zone alert modules are corroded internally and/or the wire harness connectors are corroded/Have water in them and are shorting out the low speed GM Lan. One thing you can check is look inside the rear facia just behind the rear wheels and check both modules for expanding in their brackets and water/corrosion in the wire harness connectors at the modules. The modules should be able to move easily out of there brackets.
The right side module communicates threw the left hand side module. If there is an issue with one of the modules and it is causing your issues you can unplug the left hand side detection module, this will take both modules out of the circuit, and see if things come back.
If unplugging the side blind alert modules doesn't help then you'll have to bite the bullet and take your vehicle into your GM dealer for a better diagnosis.

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Well, I finally got the bumper off, and there is dirt everywhere. I'm currently cleaning out the mess, and taking pictures. The two modules on either side are not budging. I'm about to get a screwdriver to see if I can pry it out. It was just dirty, which is why it was stuck. I don't see any swelling or corrossion, and unplugging the sensor on the left hand side didn't fix the issue

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post #21 of (permalink) Old 03-21-2018 Thread Starter
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Originally Posted by Adudewicz1 View Post
Well, I finally got the bumper off, and there is dirt everywhere. I'm currently cleaning out the mess, and taking pictures. The two modules on either side are not budging. I'm about to get a screwdriver to see if I can pry it out. It was just dirty, which is why it was stuck. I don't see any swelling or corrossion, and unplugging the sensor on the left hand side didn't fix the issue

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Pics attached. Rrh to rlh

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post #22 of (permalink) Old 03-21-2018
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Sorry that unplugging the side detection modules didn't bring things back. In doing some more research there is an HMI, human machine interface, module update that fixes a lot of issues, from blank screens to phone connectivity issues. The update is for HMI module build versions older than gmg2_14.0f105. Press power + menu + home to bring up The version number screen. The TSB is PI1375C. On code U0140 there is a tsb#PIT4730B that has you look for shorts in the high speed GM Lan circuits (2500 & 2501) witch have experienced an intermitent short to ground while going over bumps.

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Last edited by Bart77; 03-21-2018 at 01:42 PM.
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post #23 of (permalink) Old 03-22-2018 Thread Starter
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Originally Posted by Bart77 View Post
Sorry that unplugging the side detection modules didn't bring things back. In doing some more research there is an HMI, human machine interface, module update that fixes a lot of issues. The TSB is PI1375C.

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It went back into theft mode, and my gauges were going crazy while I was driving. Human machine interface update sounds a lot like "learn to use your stuff" lol.

https://youtu.be/qLNFzvsOYIk

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post #24 of (permalink) Old 03-22-2018 Thread Starter
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Originally Posted by Bart77 View Post
Sorry that unplugging the side detection modules didn't bring things back. In doing some more research there is an HMI, human machine interface, module update that fixes a lot of issues, from blank screens to phone connectivity issues. The update is for HMI module build versions older than gmg2_14.0f105. Press power + menu + home to bring up The version number screen. The TSB is PI1375C. On code U0140 there is a tsb#PIT4730B that has you look for shorts in the high speed GM Lan circuits (2500 & 2501) witch have experienced an intermitent short to ground while going over bumps.

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I can't see the screen to be able to bring up a version number lol. I won't be able to go to a mechanic until the end of the month, but this sounds like my issue.

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post #25 of (permalink) Old 03-24-2018
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Ya this is definitely a dealer bring in issue. Some sort of internal computer messing up/grounded out. Best of luck,

Let us know how it comes about


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post #26 of (permalink) Old 06-22-2018
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Hi, did you ever resolve this issue. My 2014 LT2 has had similar issues with the infotainment system and I've been trying to find a solution.

My 8" MyLink screen died about a year ago. The buttons on the control panel all stopped working, except for the one that puts the screen up and down. My radio and all my steering wheel controls still work. Sounds exactly like your problem, right?

The dealer diagnosed it as the screen being shorted out and said I needed to replace the control panel. They wanted $1100 to do that and I told them no way, mostly because I don't think it's the control panel at all.

I recently bought a working used control panel from the junkyard and swapped it in. Unfortunately the problem persisted. If the control panel was the issue then I should have received a LOCKED screen of some kind until I could have the dealer unlock it by VIN programming it. So it's not the control panel.

So the question is whether or not it's the HMI, and what my options are to diagnose/replace it...
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post #27 of (permalink) Old 07-13-2018 Thread Starter
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Hi, did you ever resolve this issue. My 2014 LT2 has had similar issues with the infotainment system and I've been trying to find a solution.

My 8" MyLink screen died about a year ago. The buttons on the control panel all stopped working, except for the one that puts the screen up and down. My radio and all my steering wheel controls still work. Sounds exactly like your problem, right?

The dealer diagnosed it as the screen being shorted out and said I needed to replace the control panel. They wanted $1100 to do that and I told them no way, mostly because I don't think it's the control panel at all.

I recently bought a working used control panel from the junkyard and swapped it in. Unfortunately the problem persisted. If the control panel was the issue then I should have received a LOCKED screen of some kind until I could have the dealer unlock it by VIN programming it. So it's not the control panel.

So the question is whether or not it's the HMI, and what my options are to diagnose/replace it...

So sorry that i didn't see this earlier. My car is actually in the dealership now. They are talking with GM to see if i can get it covered under bumper to bumper. I've got a case open and all that jazz. I described everything to the technicians rep and left the car there Monday. Wednesday night i heard back. They say, " your sensor is shorted out. 1200 to fix, parts + labor. if you want us to look at anything else, pay us more to daignose. " so gm is now in negotiation with the dealership, and i will hear back monday. i'll keep you updated as to how this goes. i have a much deeper issue other than, my "sensors being shorted".
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post #28 of (permalink) Old 07-19-2018 Thread Starter
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I've heard back and my side detection sensors are internally shorted, which is allegedly giving my BCM odd signals, which led to my cluster going nuts. Its been a week since i gave the OK to proceed with radio diagnosis and i've heard nothing back
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post #29 of (permalink) Old 07-21-2018 Thread Starter
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Originally Posted by d4rksabre View Post
Hi, did you ever resolve this issue. My 2014 LT2 has had similar issues with the infotainment system and I've been trying to find a solution.

My 8" MyLink screen died about a year ago. The buttons on the control panel all stopped working, except for the one that puts the screen up and down. My radio and all my steering wheel controls still work. Sounds exactly like your problem, right?

The dealer diagnosed it as the screen being shorted out and said I needed to replace the control panel. They wanted $1100 to do that and I told them no way, mostly because I don't think it's the control panel at all.

I recently bought a working used control panel from the junkyard and swapped it in. Unfortunately the problem persisted. If the control panel was the issue then I should have received a LOCKED screen of some kind until I could have the dealer unlock it by VIN programming it. So it's not the control panel.

So the question is whether or not it's the HMI, and what my options are to diagnose/replace it...
I have my car back, and the display is in working order. There was apparently a poor connection between the HMI and the display on the HMI end. The module wasn't bad, and there were no parts replaced. Cost me 165 for the "repair". They said that my issue was caused by someone taking apart the dash before, which was me, but that's not correct as the display didn't work which is WHY I went in there.

The side detection module was removed from the circuit and I am no longer receiving errors. They wanted 1100 to replace them, but I've found that gm uses these all throughout their vehicles including Buick and Cadillac. You can find them for a little over 100.00 each on ebay. I work for a tier 1 supplier so I may be able to find an even better deal.

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post #30 of (permalink) Old 4 Weeks Ago
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Have you had any more issues? Mine is doing same thing as far as gauges go not the radio display issue.
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