Dealer not honoring warranty work..2018 5.3 Yukon issues

[smokey_mountain]

Who is the GM rep and how do I get a hold of one. I reached out to [email protected] and [email protected], they have been giving me runaround "dealer will take care of you... if there is a problem". I suspect I need a real GM rep but how do I get in touch with one? [email protected] told me they closed the case as dealer found no issues...

Get in a GM reps ear with this and let them see the documentation from the independent GM certified techs.

 

[Doubeleive]

Funny you mention this, I was floating around checking if my 2015 Tahoe was covered, and I found this. And I wonder as my truck will be 5 years old, and I have to assume that once it is complete, I fall outside of my 5 year 100.00 mile coverage ? Recall # N19226050

General Motors has decided that a defect which relates to motor vehicle safety exists in certain 2014 – 2018 model year Chevrolet Silverado and GMC Sierra 1500 vehicles equipped with four-wheel drive, a 5.3-liter engine, and a 3.08-ratio rear axle, and certain 2015 – 2020 model year Chevrolet Suburban, Chevrolet Tahoe, and GMC Yukon equipped with four-wheel drive, a 5.3-liter engine, and a 3.08-ratio rear axle. If a wheel-speed sensor fails in these vehicles, a software error in the vehicle’s electronic-brake control module (EBCM) can cause the vehicle’s driveline-protection system to activate when (i) the vehicle’s electronic transfer case is set to four-wheel drive or automatic mode, and (ii) the vehicle is driven between the speeds of 41 and 60 MPH. If the driveline-protection system activates, the driver will experience unintended braking on the wheel on the opposite side of the failed sensor.

recalls are covered, once they have the software ready for the 14-18's the dealer will reprogram the ebcm, i'm waiting for them to do this for my 18 silverado, the 2019's have a fix already.

 

[esoteric_ast]

Im in the area and hate all the dealers. The only one I deal with is John Hiester in Lillington (30 mins south of Raleigh). https://www.lillingtonchevy.com/

John actually works at the dealership and has been there every time I have been. He doesn't turn away business from my experience.

 

[smokey_mountain]

Thanks for that, I have heard only good things about this dealership, this is encouraging. I might end up taking the truck there as Hendrick, Thompson are disgrace to the automotive profession. Especially Hendrick in Durham.

Im in the area and hate all the dealers. The only one I deal with is John Hiester in Lillington (30 mins south of Raleigh). https://www.lillingtonchevy.com/

John actually works at the dealership and has been there every time I have been. He doesn't turn away business from my experience.

 

[swathdiver]

I do not have the bottle test recorded but will do this weekend. However here is when I caught the dip/miss while ODB measuring RPM

That idle is really low, but normal, GM is forced to do this for emissions purposes. Get a BlackBear tune and forget about all this. The idle will be raised 50 rpms or so and the motor will stop that. Won't void your warranty and GM won't know it is there.

 

[91RS]

While I understand that they "did not find" anything out of spec. Independent GM-certified mechanic measured and documented the problem in writing. I wonder if it is worth it to take it to the small court. The car does rough idle two independent GM-certified and ASE-certified mechanics documented it, but dealer is pretty much free to say "in spec" to anything and they can invent these specs since these specs are not shared anywhere...

There are no “GM-certified” independent “mechanics.” GM certified technicians work only at a dealer. A previously GM-certified technician who no longer works for a dealer and therefore is no longer GM-certified, maybe.

These trucks are direct injected and highly monitored for emissions. If there was an injector problem there WOULD be some sort of DTC set or stored. It takes very little to start setting DTCs.

My guess is that you might have an engine mount issue which is letting you feel normal engine vibrations that are normally not felt. Or there’s actually nothing wrong with it and the dealer isn’t lying to you.

 

[EZ Money]

I was going to mention the engine mount issue. I had that same problem on my '15 Sierra. I had it in to my dealer several times for rough idle until they found that motor mount...replaced it and it went away.
As for a GM Regional Service Rep, I wouldn't settle for "its normal" as an answer. I would continue up the flagpole until you get somewhere. Go old-school and make phone calls. Its real easy for an internet email center to say no via email, but if you can get a supervisor's supervisor on the phone, you might get somewhere.

 

[Mickey_7106]

If its running rich on one side my guess would be that the O2 sensor is reading something off parameters therefore dumping more fuel. Just a guess, no real experience

 

[Ricocrancois]

My 17 Yukon will have a slight rough idle when in drive at a red light. Is you rough idle still there in Park?

I used 89 or 91 and the rough idle disappeared. They just rev low.

 

[smokey_mountain]

Yes, the mechanic worked at GM for many years as a master mechanic and now works on GM trucks and motors exclusively for performance and regular repairs, he is ASE certified and RPM Motorsports has huge respect among GM owners in the NC including Corvette owners.

Mount replacement was tried by a fellow forum member here and he was fine for 3-4 months and as vibration destroyed new mounts again all of his rough idle issues returned. I am sure he is reading my thread and might chime in.

When 1 bank is out spec on measurements I suspect it is more than injectors, it is probably leak somewhere but problem is that dealer is not trying to find the problem.

I get it, we have different goals, their job is to do minimum, my job is to get maximum to solve the problem... If 4 other trucks were rough as mine, I would have stopped but they were smooth, pleasant to experience. At the end of the day it is not 1988 Yugo or Trabant to rough idle like that. If it was designed to work like that then GM should add it to the marketing materials, special feature - "time machine, we will make you feel 1988".

There are no “GM-certified” independent “mechanics.” GM certified technicians work only at a dealer. A previously GM-certified technician who no longer works for a dealer and therefore is no longer GM-certified, maybe.

These trucks are direct injected and highly monitored for emissions. If there was an injector problem there WOULD be some sort of DTC set or stored. It takes very little to start setting DTCs.

My guess is that you might have an engine mount issue which is letting you feel normal engine vibrations that are normally not felt. Or there’s actually nothing wrong with it and the dealer isn’t lying to you.

 

[smokey_mountain]

I almost did the tune... but glad that independent shop explained to me the ECM module gets a mark every time it is flashed and GM knows how many flashes GM authorized, and if there are extra that they did not, they will send you packing on the warranty claim. It speaks to the integrity of this independent mechanic, he could have installed the mod an d charge me $350, but he did not, saying do not lose your warranty and give GM any excuses to deny expensive repair work.

That idle is really low, but normal, GM is forced to do this for emissions purposes. Get a BlackBear tune and forget about all this. The idle will be raised 50 rpms or so and the motor will stop that. Won't void your warranty and GM won't know it is there.

 

[smokey_mountain]

I do get it very rough at the stop in D or R, in P it is still there but almost not noticeable but defiantly there.

My 17 Yukon will have a slight rough idle when in drive at a red light. Is you rough idle still there in Park?

I used 89 or 91 and the rough idle disappeared. They just rev low.

 

[smokey_mountain]

I do think it is more than injectors, as all 4 are out of spec, I have asked RPM Motorsports to stop troubleshooting as this is on my dime, I am already $350 into diagnostics and rentals while truck is in warranty, 8 months old with 9,000 miles on it.

If its running rich on one side my guess would be that the O2 sensor is reading something off parameters therefore dumping more fuel. Just a guess, no real experience

 

[Tonyrodz]

I almost did the tune... but glad that independent shop explained to me the ECM module gets a mark every time it is flashed and GM knows how many flashes GM authorized, and if there are extra that they did not, they will send you packing on the warranty claim. It speaks to the integrity of this independent mechanic, he could have installed the mod an d charge me $350, but he did not, saying do not lose your warranty and give GM any excuses to deny expensive repair work.

@BlackBearPerf --just curious about this remark. True?

 

[gat0r]

sounds like typical GM mechanic response
although some tuners do trip the module count.. others dont


they havent seen or inquired about my BBP tunes

 

[smokey_mountain]

To be clear that response was from an independent performance shop, they happen to work on GM exclusively but they are not affiliated with GM in that sense. I actually was appreciative that they explained that to me. If Blackbear can prove it otherwise that would be fantastic. Tune may or may not be able to solve my problem. I still think there is a problem that RPM upping won't completely solve. They need to find why bank #2 is out of spec.

sounds like typical GM mechanic response
although some tuners do trip the module count.. others dont


they havent seen or inquired about my BBP tunes

 

[Doubeleive]

@BlackBearPerf --just curious about this remark. True?

they have already stated before that nobody has been denied a warranty claim because of there tune and I have never read about one happening before either.

 

[Bob2C]

I had the motor mounts replace due to idle issues under the TSB. My dealer was good about doing the work. The truck was fine for approx 3k miles and the the rough idle returned although not as bad before the mount change. The interesting thing now is that it’s not all the time when the engine is up to operating temp. It seems like if I get on the accelerator harder thats when it happens after coming to a stop. I have done crc intake cleaning and gone in and cleaned the throttle body. Surprisingly there was a good amount of carbon buildup for having 16k miles on the engine. I don’t know what my next step might be at the moment. Yes at times it’s annoying but most times it doesn’t bother me since the mount change. All my driving is hard stop and go. 4 to 8 mile trips, stoplights and traffic. So I am just in a waiting period. I do feel it will produce a code at some point in my opinion.


Sent from my iPhone using Tapatalk

 

[91RS]

I do get it very rough at the stop in D or R, in P it is still there but almost not noticeable but defiantly there.

Definitely sounds like an engine mount issue. ​

 

[91RS]

I do think it is more than injectors, as all 4 are out of spec, I have asked RPM Motorsports to stop troubleshooting as this is on my dime, I am already $350 into diagnostics and rentals while truck is in warranty, 8 months old with 9,000 miles on it.

Like I said, if you really had an injector problem there WOULD be DTCs. There are so many DTCs now for slightly off fuel trim and such that there is absolutely no way there is a problem with those injectors and you don't have a DTC. What equipment is this shop using to test the injectors? Those numbers you posted in the first page look nothing like I've ever seen from the AFIT, which is the proper tool to test these injectors. If they aren't using an AFIT with the appropriate SIDI DMU and connector adapter for 17+ (which altogether costs upwards of $5000) then those numbers are absolutely meaningless.