2015 Chevrolet Silverado 4WD, 77,430 miles, automatic. Just had dealer replace left bank fuel injectors as 2 of them where causing check engine light to come on for lean mixture.
Since truck was repaired for the injectors, driving down the road the touch screen changes screens and is not functioning to the touch. The screen over the steering column changes as well, and the control knobs for the A/C Heater controls have lights that rotate clockwise lighting up the clear, blue then red. One time the OnStar voice came on and was not able to be turned off.
Shutting off the truck usually stops all the issues, and restarting usually allows touch screen function and resetting. The radio does not lose station settings or the clock to change time.
Dealer thinks it is the HMI, wants to reprogram the HMI to test if this will fix issues. We have done as directed by some previous YT videos, disconnect both battery cables, remove the radio fuse, disconnect all plugs to the HMI, drain the voltage from the system via turning lights and wipers on, stepping on brake pedal, then waited 15 minutes before reinstalling in reverse order.
Didn't sove issues, and noticed that radio station settings were still there and clock kept time.
Took to another shop and they found no codes via scanner, so traced wiring and checked grounds for proper connection.
Still has issues with touch screen and screen above steering column changing, and lights rotating on A/C heater controls.
No idea what to do now, where to go.
What do you think we should do next?
Dealer thinks it is the HMI, wants to reprogram the HMI to test if this will fix issues.
it can't hurt
Well it might, he keeps charging $80 an hour for basically doing nothing. Is guessing what it Might be, seems a lot like a "parts changer" until the problem is resolved. Last visit $160, didn't make me pay because he wasn't sure it was repaired, said this is what you owe if fixed. That was couple weeks ago.
Apparently either their scan tool doesn't find anything, or no tech that knows how to use it. Couple of real BAD repairs came out of this dealer lately.
Just very odd that this worked fine before they replaced the left bank injectors, then after issues.
Have another appointment with them next week, claims still have open bill for the $160. May have to go further up the ladder until get some satisfaction.
Didn't sove issues, and noticed that radio station settings were still there and clock kept time.
Odd.. that circuit remained energized somehow or this wouldn't occur, unless the radio presets are store in the HMI.
My thoughts also, very odd radio presets and clock remained energized some how. Today only the gauge cluster screen went nuts, the touch screen and radio not affected. Doesn't make sense to me.
My thoughts also, very odd radio presets and clock remained energized some how. Today only the gauge cluster screen went nuts, the touch screen and radio not affected. Doesn't make sense to me.
Do you know if they reprogrammed your ECU after the injectors were installed? I'm asking because although there should be no direct correlation between the two events, 'the timing' suggests otherwise.
To reset a Mylink/Intellilink "Infotainment" system in GMs from 2014-2016 you "Press the home and fast-forward buttons for at least 10 seconds". The entire system should reboot. I'm aware you mention the touch screen and radio are fine today.. just in case.
Don't know for sure about the ECU reset, but will give the Infotainment reboot a try.
Performed the reboot as described above. Appears to have done nothing except change the radio station. Nothing on screen changed. Should the radio be off when performing?
Just attempted again with radio off. Clock was on screen, then when home and ff buttons pressed screen changed to menu blocks. Again nothing except radio presets moved, then changed station.
Actually I supplied that info in case your system froze up. (you said it was working) To answer your question: It's generally best to do a 'clean reboot' on any computer system. But no, it's not 'necessary'. That's why they have the reset procedure for the infotainment systems, ie it becomes 'stuck'. The reset/ reboot doesn't hurt anything accept losing your presets
Apparently the reboot was unsuccessful as the presets remained intact. Pressed and held both together at the same time, just went to Home and saw no other changes other than one station change.
Don't have any idea where to go now.
saw no other changes other than one station change.
Don't have any idea where to go now.
Sadly, I can't think of another way to avoid the GM dealer. It's one thing I can't stand about these interfaces. They're all different and proprietary. Reset was worth the try tho..
Btw, have you checked through MyLink to make sure the software is current? It's suppose to be automatic, since your system is acting odd, I'd look. A software update can brick anything..
FYI- A hard reset should have brought the infotainment system back to factory defaults.
How do you recommend checking MyLink software? Found a video on YT but doesn't do anything on my unit. Did I do the reboot correctly? Absolutely nothing seems to work with my unit.
How do you recommend checking MyLink software? Found a video on YT but doesn't do anything on my unit. Did I do the reboot correctly? Absolutely nothing seems to work with my unit
I'll answer your last question first. You reset the infotainment system. Allow me explain the difference between a 'reboot and a reset'. In this case, a reboot is as simple as powering off a device then powering it back up. A reset is a stronger action because it "restores the device to original" settings. The difference is significant because the best first step is a simple reboot. The directions I last provided you were for a "factory reset". That action resets everything to those factory defaults. (I realize you aren't sure the infotainment system actually reset)
Checking or updating your MyLink software should be very simple. Regardless of which video you saw, just search through your menu options until you find "update". Find it, 'select it' and see whether it's 'up-to-date'. Be very patient if starts updating
Last 3 days in a row, screens change, lights flash, nothing seems to help. Checking for MYLInk updates states something about a USB. No other info available on updates.
Really confused.
screens change, lights flash, nothing seems to help. Checking for MYLInk updates states something about a USB. No other info available on updates.
If you are unable to reset your MyLink infotainment system, then a reboot or software update won't fix it. I've not been sure whether or not you had a software or hardware issue so far. That's why I asked you to try to update the unit. The statement "it states something about a USB" only implies the unit did not update. If it had, you would have seen something like "up to date" or "system updating". So essentially, this looks like a bad HMI. In your first post you mentioned you had already checked all fuses, power and grounds. There's literally nothing left but the unit itself.
OK, the issue has now presented itself for the last 3 days, every day. Was only every 3 days previously. So.....apparently it most likely is the HMI.
Is there anywhere to look that lists GM error codes and their service corrections? Finally found a bunch of error codes on the touch screen under Dtc. One code in particular is the same code as dealer listed on report last time.
Is there anywhere to look that lists GM error codes and their service corrections? Finally found a bunch of error codes on the touch screen under Dtc. One code in particular is the same code as dealer listed on report last time.
You can try here: https://www.obd-codes.com/gm/
thanks for info.
Saw Scotty's recent video on how to completely drain all electrical power from the vehicle using a 10 watt 1 ohm resistor. Unfortunately I can't locate the resistor locally and definitely not for the $1 he stated in the video. I will have to order one if I try this reset.
My question is, how long would the battery need to be disconnected without using the resistor?
I remember when I replaced the battery couple years ago it was disconnected for an hour or more and had to reset the clock and radio after replacement.
Would this work as well as using the resistor if the battery was disconnected for a long period of time?
Would this work as well as using the resistor
https://carkiller.com/scottykilmer/qa/1-ohm-10-watt-resistor/#post-194088
FYI this does not magically fix mechanical problems, or reset permanent trouble codes.
The link provided is not the video I'm referring to. The video In question uses the resistor between the unconnected battery cables. From a year ago. Scotty states it completely drains the voltage and resets computer to factory settings, eliminates all codes, including permanent.
I know exactly what you're talking about. I watched the video you saw.
Please read the post I linked to. You don't need any resistors.
The link provided is not the video I'm referring to. The video In question uses the resistor between the unconnected battery cables. From a year ago. Scotty states it completely drains the voltage and resets computer to factory settings, eliminates all codes, including permanent.
Here's the video: 1 ohm/10 watt resistor . The resistor is used prevent voltage spikes that might occur if you just connected the battery cables together, that's all. The 'resistor method' is simply a 'slow drain method'.
Disconnected battery for 2 hours, turned on every switch/knob. No lights, no wipers, no dome light, no brake lights, no radio or MyLink, nothing worked with battery disconnected.
Cleaned battery terminals and clamps just because, and reattached after the 2 hour down time. Radio still had presets and clock still kept time! Tire pressure re calculated, asked to open driver door and roll down window. Radio changing screens to all different pages.
I don't get it. Guess I need to talk to the owner of the dealership. Issue since they replaced left bank injectors, service manager has been pushing "repair" back now 2 months, and charging for time spent previously with no resolve.
Very disappointed in the service.
The clock not losing time alone indicates the vehicle had to remain partially energized. The dealer likely has a mechanic who does know how to properly use a high level scan tool, you really want/need both on something as complex as this.
Check out @jack62 's post and link . Have aftermarket unit in my car...
OK, went back to dealer today and was given a maybe I can look at it this week if you leave it today. Or, I can make an appointment for September sometime. Didn't like that answer so I went up the ladder. It is being looked at as I write this by the Foreman (Head) Tech. Spoke with him describing issues, showed the videos of issue, discussed possible causes. He really seemed to know what to look for, and where.
He stated that first thing to do was reprogram the HMI, it will fix or fry HMI. There is also a ground cable issue with the 2015 Silverado that corrode in the clamp or under the insulation. He said he has replaced over 50 ground cables and resolved similar issues. Lastly, there is a service bulletin about a "rub through" in the wrapped cable routing.
Big service boss agreed that it is very odd this started after they replaced injectors (within 1/2 mile), so we will see what transpires as far a repair and costs. He also stated that the tech that originally worked on the injectors was really not the proper tech for the job as he is only 50% trained currently.
It was worth the time to move up the ladder.
Thanks for all the replies on this problem.
I will update when I know results.
Him mentioning a "half-trained tech" sounds much like an admission or deflection, depending on your point of view, but it's an interesting remark. Hopefully the next tech knows to check and fix any ground issues before trying to reprogram. If they find & fix a bad ground, that alone could easily resolve every issue you've had. Good luck
Dealer just called and said truck was ready. They reprogrammed HMI, radio and radio module. Said they couldn't get issue to replicate. They started truck and brought up for delivery, touch screen locked up, same issues as before. Service advisor tried to recalibrate touch screen, no go. Talked with tech, said must be the HMI, advisor wants to make sure because he doesn't want to just throw parts at it. Currently waiting on call back from advisor as to next step. Will be looking into new HMI is best guess at this time. Had to pay for diagnostics and 1 hour labor, not pleased with outcome so far. Will be talking further up the ladder again I guess.
touch screen locked up, same issues as before.
Probably hopes you'll buy a new HMI from him, but "at a discount".
Code came up for bad CPU, read HMI. Advisor said to bring it back in today for code scan to verify same code, bad HMI, can have one here Monday, no "at a discount" price, quoted $890 out the door if I remember right. Yes I can get one online for near $600 programmed, but dealers will have 2 year warranty, not sure about the online.
Picked up truck today, new HMI and programmed, dealer stated fixed, $920. Didn't make it out of the lot before failure! They still have truck. They will contact Chevy regional manager, trouble shooter etc. Very upset that $1080 later still not fixed. Will wait and see what Chevy has to say, then might have to go some other route. Didn't need the HMI, don't think I should have to pay for it. Service manager stated he will try to get Chevy to help with bill. Very concerned with issue.
Thanks for update. That dealers been inept so far.
Help request to Chevy from dealer came back with an order to replace the touch screen. Screen currently on order and will be installed upon arrival. Dealer Service Manager states not to worry, as if it doesn't fix issue, he will "eat" it just like the HMI. The check for the last $920 has not been deposited, being held until issue is resolved to his knowledge. I will only be charged for whatever part(s) and labor actually fix the problem. Anything else replaced that can't be returned (electrical parts) and labor will be on him. I will see what happens after the screen replacement and keep this thread updated.
I will only be charged for whatever part(s) and labor actually fix the problem.
You're in for $920 now, willing to pay additional costs of future parts/labor 'that work'.
I think that dealer is a crook.
Misunderstanding I believe. Check for $920 being held, not deposited until issue resolved. That charge didn't fix issue, so dealer/Chevy not billing for parts/labor for HMI. If screen fixes issue, only pay for screen and install. If screen doesn't fix, that's on them as well. When issue finally fixed, I will only be responsible for the part(s) and labor that actually solved issue. Will see what happens in the end.
Misunderstanding I believe. Check for $920 being held, not deposited until issue resolved
My mistake, I thought the the dealer was keeping the $920 you've spent. and they've not fixed anything! That would be criminal IMO.
OK, new touch screen assembly arrived last Thursday and installed. Apparently this has resolved the issues with all the lights, radio station changes, etc. It is now going on day 4 without problem. It was determined that the touch screen itself was to blame. It seems that the touch screen somehow "warped" internally and was sensing that it was being "touched".
Dealer is still not sure why the DIC changed during these episodes, but that seems to have ceased as well. Now to the bad news. The new touch screen assembly with install was $1044, a very expensive assembly with only 1 hour labor.
So we, the dealer service manager and I, sat down to determine who pays what. Since the dealer already has my check for the failed HMI replacement of $920, he gave the option of paying for the HMI replacement that didn't fix the issue, or pay the $1044 that did.
Now that I know the touch screen "appears" to have fixed the issues, and I really don't think the injector replacement had anything to do with the touch screen failure, I had to rethink my decision. It has been really hot here, and the 100*F+ temps seems plausible that it had possibility of causing the "warp", I opted for the lesser of two bills.
Dealer will continue to hold my check for $920 until this Wednesday just to verify issue is resolved, will call them to verify. I will have 2 years unlimited mileage on HMI replacement part. The touch screen module will have 1 year. Dealer will absorb all costs for touch screen assembly and labor. Best I could do with negotiation.
I'm aware that Chevy/GM told them to replace touch screen, and at one point I heard service advisor comment that screen was "warranty". So.......I think they still got paid for my HMI repair and the screen as well.
In the end, truck "fixed", paid the HMI replacement bill and will move on. Unless there are further issues with this repair I will let it go.
It's fixed, you're satisfied and that's all that matters. I am glad this worked out for you!