When driving on highway transmission surges/pulsates under light acceleration. When accelerating most often when vehicle is already in motion there is a extreme delay in shifting which causes a jerk at lower speeds or an delayed then hard shift at slightly higher speeds. Most noticeable in traffic.

- Garland, TX, USA

Transmission clunks when slowing down

- Buford, GA, USA

Bought this truck brand new with 9 miles on it. (previously drove a Ram 1500). My first GM product I've bought in my life and I'm disgusted! I'm a victim of the 'transmission harsh downshift syndrome'. slowing down normally is clunky, nothing smooth about this 'automatic transmission' 6 speed btw. When slowing down abruptly (in stop N go traffic), transmission slams into gear while downshifting, feels like I'm being rearended. Took it to the dealership a total of 6 times, they say 'operating as designed'....yea right. My Ram never did this...talked to corporate on 2 separate occasions... 'there is nothing we can do' is what they tell me. Poor design, hate the truck, disgusted with GM. I'm now making double payments to get out from under it (because I'm upside down from buying brand new and GM thinks so much of their product to charge an arm and a leg and my first born) to trade it in on either a foreign car or back to Ram. GM doesn't care, rich billionaires crapping on the middle class, too many 'pencil pushers' creating 'new designs' to be fuel efficient and impress their bosses to make their bonus. News flash....we buy trucks not be fuel efficient, but to be manly and haul things and go off road and cary a few passengers while we're at it!! save yourself the hassle and dont buy a GM product.

- White House, TN, USA

This trucks transmission shifts whenever it wants to... I was driving 45mph and coasting to a red light when it downshifts hard but when the light turned green again and I pressed the accelerator I had no torque, like I was in 5th gear and should have been in 2nd. I pressed a bit harder and it downshifted hard again and was at 5K rpms! I thought it had an 8 speed transmission, but it sure doesnt seem like it. My truck was new and only has 5K miles on it. Unacceptable

- Pinellas Park, FL, USA

Transmission slips, knocks, and grinds in some instances. No check engine light from these issues but spent 30K + and I having these issues at 13,500 miles.

- Deltona, FL, USA

When vehilce goes from 6 cylinders to 4 cylinders it shakes really bad and causes headaches at all speeds ! worse at higher speeds

- Spring Hill, FL, USA

The transmission slips or shudder, also has free wheeled when going down hill at slow speeds, also occurs in reverse, usually about 1 to 2 car lengths. Have returned to the dealer several times and been told that GM does not have a remedy. Had the service recommendation of a transmission flued flush done twice with different fluid installed with no change. Has been in the dealers shop for 3 weeks with GM looking at the problem, no solution in sight. No confidence that GM can fix the problem. This could develop into a serious safety issue.

- Gig Harbor, WA, USA

Takata recall. While backing out of my driveway I heard a loud clunking sound coming from the under carriage of my truck. It stopped for a second and then did it again the clunking sound got progressively louder. I noticed the sound at low speeds, high speeds, going over minor bumps and big bumps in the road. Additionally, while going over big bumps I could hear what sounded like flexing and/or grinding metal coming from the rear suspension. I stopped the vehicle and proceeded to rock it back and forth and noticed the knocking/grinding sounds coming from the under carriage and the suspension. I got back in the vehicle and drove off and the sounds again started. I have infant twins that I was driving in my vehicle at this time and I became very concerned for their safety and mine. I took the vehicle to the dealership (since it is brand new and at the time only had 2-3K miles on it). They said "its a known problem in Chevrolet trucks" the paperwork they gave me after the "repair" stated" lubricate rear leaf springs and re-torque bolts" this indicates I had loose suspension components. The problem occurred again and I again took the truck to the dealership. They again stated the same repair and refused to provide any other remedy and also refused to replace the leaf springs. The same problem happened again. Again I took the truck to the dealership and again they refused to provide any other form of service to remedy the problem. My truck has less than 8K miles on it and it has been in the shop on 4 separate instances for the same suspension problem. The clunking and loose suspension noises have returned and I will be taking the truck in for the 5th time. This is unsafe, and my wife refuses to drive in my truck nor allow me to drive our children in our truck because shes concerned for their safety!

- Corona, CA, USA

Vehicle developed a vibration at 80mph which fades in and out. Tires were road forced balanced, and alignment was done. Transmission fluid was changed. The shacking at 80mph continued. On a 30 mile commute at 80mph the vibration is extreme 25% of the time (like driving over a rumble strip), moderate another 25% of the time, and the other 50% the vibration is not noticeable.

- Boynton Beach, FL, USA

The eight speed automatic transmission stutters and acts like it doesn't know what gear to go into under light to normal acceleration. This occurs while cold and during the warming period, (normally up to around 180 degrees), but tends to resolve after the engine is completely warmed up. This transmission problem is continuous and happens every time after the vehicle sits all night or if it has simply sit for a few hours. It is very apparent, other passengers ask what is wrong with the vehicle when they ride in it. I bought the vehicle new, but when I took the test drive it was already warmed up. Therefore I was unaware of the issues present. I went back to the salesman to describe the problem and was informed this happens with all the 2018 eight speed Silverado's he has driven on their lot. I looked on the internet and found these transmissions have a learn cycle, so I decided to give it some time to see if was a learning curve with the computer. It never cleared up. I later brought the vehicle into the dealership for the initial service and described what had been happening with it to the service department. I left the vehicle overnight so the technician could drive first thing in the morning and perform an services. The next day I was called and told my vehicle was ready. Upon arrival I was informed the technician was able to duplicate the problems I described, but it was normal for the eight speed transmission. However, it becomes worse to bring it back in for further diagnosis. I called GM, they also looked into the case for about a week, then called back and stated that is normal for the transmission. I bought the vehicle new with about 2,500 miles on it, (demo), and have had it only a few months. It currently has less than 10,000 miles on it.

- Columbia, SC, USA

Several times, while driving right around 55 mph, the transmission downshifted for no reason on thruway conditions. When this happened, it was almost like slamming on the brakes quickly. On all occasions, my body lurched forward. If someone was behind me, I probably would have been rear ended. On another occasion, with my son in the truck, we stopped at a red light and the transmission clunked so violently, that we both thought we were rear ended at first. I described the issue to my GM service shop who said that they couldn't find an issue and that the codes were all normal. I was advised that the clunk at the red light was common, as the transmission has to relieve pressure. No way is this normal! I got on line to review forums and it appears this is a very prevalent issue. Yesterday, I lost my transmission completely on a thruway. I heard a loud clunk and the rpms spiked. I left the highway asap but could not go over 30 mph or the rpms would just spike without motion response. Exiting the thruway at this speed was very dangerous! even with hazards on, drivers seldom slow down or move over, especially 18 wheelers. These transmissions are clearly a safety hazard.

- Highland, NY, USA

Constant vibration/shake coming from the vehicle at any speed above 65 mph. The truck has been like this since the day it left the dealership. When on highway and vibration is felt, putting the truck in neutral does not change the vibration, slowing down makes it slightly worse, speeding it makes it slightly better. Feels like there is something seriously wrong with the geometry of the truck making it unsafe to drive at highway speeds. Road force balance was already done and the problem persists on a brand new truck.

- Miami, FL, USA

In May 2018 I purchased a new Chevy Silverado lt Z71 pu. I live in Colorado and when I drive the truck down the I-70 mountain pass the transmission is downshifted beyond what io would call a safe down shift. Im traveling down the pass, just coasting, down hill assist mode is off @ roughly 55 mph the transmission down shift hard. The RPM goes from ~1850 to ~3800 RPM. The engine and transmission and engine both make a lot of noise when this happens. I traveled the pass about 8 time now and the truck does this funny shift everytime and I have picture showing 4 events. I've taking the drive into the dealer and since the computer doesn't log a error code the dealer doesn't know what to do. This past week they gave another 2018 P/U with the same tranny and engine and that truck did not do the same downshift. I believe there is something wrong with my truck and also if this event happened in the winter on a snowy road the truck would spin out of control and cause a accident and is a huge safety concern. I also filed a complaint with GM but they are really not help to resolve this problem. The dealer looked at the truck again today, no codes recorded, the reset the transmission memory today to try and satisfy my need to do something. I now waiting to hear back from the dealer on the next steps. I will also call GM again to give them this information. I am attaching picture that clearly show this problem. I also given the dealer the same pictures.

- Longmont, CO, USA

Parked and shut off, disconnected trailer. Truck rolled back while in park. I jumped out of way and tried to open door to stop. Door knocked me down and continued backwards dragging me. Final stop over edge of pond against tree stump. Had towed to dealer for inspection by Chevy engineer. 2 weeks no communication.

- Marshfield, MO, USA

Truck stationary. Started engine. Immediately message showed up on dashboard indicating steering assist low, drive carefully. No power steering. Traction control warning lit. Shifted into reverse; truck would not move as if in neutral. Truck move move forward in drive. Shut off engine and restarted twice. No change. Did not attempt to drive.

- East Alton, IL, USA