Truston Gunter

I also changed tires when I bought the truck. Didn't think it would matter but after reading some other forums, many have said that an all-terrain tire will lower your gas milage. By how much do you think if this is true??? Anyways I have some BFG all terrain KO2 LT285/65 R20. I also have a K&N intake, mainly for the sound (I enjoy the growl) and while K&N states you would gain MPG's other have said that it would actually lower them? More than likely I think the issue is the Driver. While I drive within the posted speed limits, I may be a little heavy on the throttle approaching said limits. Yay for gas prices!!!!!

Since this post I have contacted the dealership from which I purchased the vehicle from, ( Cavendar Auto Country in Weimar, TX ) which is 160 miles away. At first they told me that the info I gave have them didn't seem right and they would look into it. They also confirmed the service bulletin. The local dealer I use is about 30 miles away (aransas autoplex in Aransas Pass, TX), they explain to me that GM would deny their claim because it is over the 7500 miles threshold . Later on Cavendar called me back after speaking with their manager and informed me of the same. I personally believe the size of the dealership in this case matters. Both of these dealers are "small" versus a national chain who would more than likely absorb any loses if GM did deny a warranty claim after the work was done. Anyways, that's all the info I have right now, I also found a fixed to the squeaking, just gotta keep it above 50 mph in the drive thru and voilà no squeaking!!!!!

geez, I don't get anywhere near any of those numbers!!! I hover around the 9-10 mpg mark empty!!! Guess thats what short trips to and from work will do do you (10 miles one way)

Thanks for sharing! Curious if the truck alerted you to add oil or did you just check it because of the heavy towing?

Received the message "service tire monitor system" and when you check the current tire pressures, it shows blank. This truck now has about 24,500 miles on it and is a 2020 year model. My assumption is that this should be a simple warranty fix but since I purchased new tires at 288 miles ( I like the aggressive look of the BFG K02's) the dealership is reluctance to check it. I have to agree that if they, the dealership, deem the issue to be physical damage, not only would the warranty not cover it but I would then have to pay a diagnostic fee and/or labor for dismount/mounting of said tire. It is extremely frustrating how dealers always lie, cheat and deceive at every single opportunity they get to ultimately screw the customer over. Maybe I'm just being a drama queen but after purchasing a $75K truck, if something as trivial as a $15 dollar sensor (at cost, I bet they retail for over $100) I expect them to replace it NO QUESTIONS ASKED if it fails after 2 years. Yes its possible discount tire COULD have damaged it but if they did, would it have worked for 19 months before it went out????? (tires were purchased OCT 2020) Just another example how how bad dealership totally suck at the customer service portion of the auto industry. Long gone are the days of "quality built". Prolly will end up just buying a new senor on ebay and let discount tire install it ( they will install free of charge with certs) . Thanks for listening to my rant,

I was feeling cheap and bought a set of sensors off of ebay. Part #84338125, took them to discount tire for installation. After they installed, it took some convincing for them to "program" the sensors but I told them to treat it like the vehicle. he did and the truck "learned" the sensors without any problems. Very happy with this setup!!!!

So I have a 2020 Sierra HD with this same problem. According to the dealership, this is NOT covered under the bumper to bumper warranty and is ONLY covered for 7,500 miles regardless of any service bulletins. . Well my truck has 21,908 miles and guess its my fault for not taking it in sooner thinking I had 3 years / 36,000 miles for any "manufacture defects" to be corrected. Very disappointed however, I would like someone to verify this is true and not just the dealership being...... how can I say it nicely...... "ill-informed"....... Hate feeling like this dealership is trying to not do the work for whatever the reason.

So I have a 2020 Sierra HD with this same problem. According to the dealership, this is NOT covered under the bumper to bumper warranty and is ONLY covered for 7,500 miles regardless of any service bulletins. . Well my truck has 21,908 miles and guess its my fault for not taking it in sooner thinking I had 3 years / 36,000 miles for any "manufacture defects" to be corrected. Very disappointed however, I would like someone to verify this is true and not just the dealership being...... how can I say it nicely...... "ill-informed"....... Hate feeling like this dealership is trying to not do the work for whatever the reason.

I am having a similar issue with the driver side folding very slowly and at times stopping midway. I DREAD having to take to dealership and with only 20K miles and paying a small fortune for this truck, I'm pretty bummed. I have tried to do the reset, heard the pop and everything but still have the same issue. Wondering if anyone has "upgraded" the internals with success?

This is very new to me so I will be doing lots of reading!!!

Great info!!! This puts my mind at ease and I appreciate you taking the time to explain it.

I don't consider myself to be towing "aggressively" but I do travel at the posted speed limits when applicable. Here in TX alot of the highway speed is 75mph. When I set the cruise control, I get a lot of shifting when going over small overpasses so I tend to lock out the 2 overdrive gears which leave me at around 3k rpms. I figured that puts me closer to the powerband and with a gas engine I didn't think this would hurt anything. Thus my mileage can be pretty crappy.

I do my own maintenance so I can guarantee it had 8 qts. Even my 2015 5.3L took 8 qts so this is not a mistake I would have made but thanks for the input. I sincerely appreciate everyone taking the time to give me your thoughts.

I use mobile 1 5w-30 full syn. I always thought this was a good high quality oil. It sure is expensive enough! As far as the air filter, at 7K I installed a K&N intake. mainly cause I like the sound, I don't put much stock in HP gains. Would this have an effect by allowing too much air?