At around the 105k mile range the truck would make a gear whine sound and shudder between gears at around the 50mph range, speeding up or slowing down a bit would fix the issue. By 110k miles the truck was making the gear whine sound at speeds over 10 miles an hour studdering at every gear change. I took it to a mechanic who said there were no TSB's for the truck and suggested doing a trans oil dump and filter replacement. The trans filter was replaced, and 7 quarts Mobil1 LV ATF blue label oil was put into the transmission. The studdering has reduced to just at the 50mph range but the gear whine sound has if anything gotten louder.

- Magnolia, TX, USA

In [XXX] I took my truck in for oil change, inspection and 3rd complaint of shaking, and shuddering, lurching at a stop, they told me my transmission was broken, they would have to order the part and their was no ETA on when they would get it. I was told there were NONE in the tri-state area from another dealership. We are a one (1) car family and Jim Trenary Chevy said they don-??t give out loaners, therefore we had to rent a car at $370 a week. Here it is January 15 and we are STILL renting a car. They finally got the part sometime last week, but WE NEED HELP! We have spent over 5,000 in rental car fees and GM will not reimburse us until we return the rental car, even though we have paid cash every week, and we-??re have had to borrow from my husbands future paychecks. WE ARE BROKE. We have to pay the deductible of $500 when it is finally fixed, plus, during the snow storm last week someone side swiped my rental car, and I have to give Enterprise $1500 when I turn in the car for my deductible from insurance. I read there is a 65 million$ law suit pending to GM for these faulty transmissions, yet they don-??t feel responsible to pay our expenses for something that IS THEIR PROBLEM, NOT OURS, but they have made it my problem, and I am shouldering all the financial burden of this, their faulty transmission. WE NEED HELP, We are now broke and now can not afford to pay for the rental, or our repair deductible, or our car payment. We don-??t make that kind of money. My husband is the only one that works full time. WE NEED HELP, and no one wants to listen or seems to care. WE ARE BROKE! Thank you for listening. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

- St. Peters, MO, USA

transmission shudders from 20 to 60 under light acceleration. took to dealer and said that needed different oil. dealer stated that a common issue with these vehicles. Cost $500 to replace oil to proper oil.

- Beloit, WI, USA

shutter or vibration issue regardless of speed even when cruise control is active. took it to the dealer and they said the wrong fluid was installed at the manufacturer. also told me my extended warranty would not cover it since it was not a mechanical issue. i saw that GM has issued a service bulletin 18-NA-355. however, i have yet to discover from any online account that this fixed the problem. why is there no recall for this common issue.

- Morganton, NC, USA

The vehicle stuttered upon acceleration between 20mph and 35mph. After the 2018 Chevy Colorado was taken into the Chevy dealership for inspection, the torque converter failed at roughly 76,000 miles. A bad torque converter can potentially cause an accident. It can lead to engine revving issues, sudden speed changes, which can be dangerous while driving. The torque converter failed and left metal shavings in the transmission causing the transmission to need replaced as well. This was diagnosed by the Chevy dealership and has a repair ticket of over thirteen thousand dollars. ( $13,000 ) which most people can't afford to absorb. After a quick Google search, this appears to be a common problem. There should be a recall to fix this issue.

- Yukon, OK, USA

What component or system failed or malfunctioned, and is it available for inspection upon request" It appears to be a piston failure, as there is compression and diesel in the crankcase. Engine is still in the vehicle but once removed it will be available for inspection if needed. How was your safety or the safety of others put at risk? Power loss on a busy highway requiring lane changes without available engine power is dangerous. Has the problem been reproduced or confirmed by a dealer or independent service center? Not yet Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? No Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear" P0266 code and engine light set immediately after the failure. But there were no warnings prior

- Bellingham, WA, USA

-??Service trailer brake system-?? won-??t turn over but will crank Transmission shifting very hard around 3rd and 4th gear

- Charlotte, NC, USA

The key will not come out of the ignition when the vehicle is in park. This presents a safety issue where the driver cannot leave the vehicle because the key is stuck in the ignition. The problem has been reproduced by the dealer and found to be a faulty transmission control assembly. The faulty transmission control assembly has now been replaced twice on my vehicle, once at 19,000 miles and again at 33,000 miles. There were not any warnings or messages, just one day the key won't come out of the ignition.

- Bedford , NH, USA

When accelerating there is a shake. From diagnostic it seems there is an issue with the torque converter.

- New London, WI, USA

Transmission is slipping and vibrates while driving. Delayed acceleration.

- Long Beach, CA, USA

While driving, there is noticeable -??shudder-?? that seems to feel like an issue with the transmission when it is shifting (automatic transmission). Research online shows this to be a consistent issue and concern with many owners of the 2018 Chevy Colorado. Having this shudder has not had a solution by the several mechanic shops I-??ve been to. Nobody seems to know what is causing this issue, but with many owners having this same problem there must be something that Chevrolet can do to resolve this issue. We bought the vehicle brand new in 2018, and it is now paid off, but this shudder while driving has happened since we have owned the vehicle. It seems to be more prevalent while driving between 30 mph to 60 mph. The shudder happens during ever drive we take. We have the vehicle maintenance performed on all of the recommended intervals for oil, fluids, tires, brakes, etc. This is definitely something that should be a recall.

- Needville, TX, USA

Transmission is shuddering, some jerking starts and stops.

- Rocky Mount, NC, USA

clunking in the transmission, when slowing down it feels like you got rear-ended. Then when accelerating from a stop the transmission seems to slip and then catch and then engages and shoots you forward, feels like it surges forward. TSB to replace the transmission fluid was done at about 18k miles, it didn't fix its still doing it now. It did it since day one from the factory and the TSB didn't correct it.

- Harwinton, CT, USA

Car begins to shudder intermetiently if driven over 50 MP due to faulty factor installed transmission fluid, can cause panic when unaware of what is happening. Also can marginally effect handling.

- Huber Heights, OH, USA

The contact owns a 2018 Chevrolet Colorado. The contact stated while driving 40-60 MPH, the vehicle would shudder while depressing the accelerator pedal. There was no warning light illuminated. The contact stated that she was able to continue driving. The vehicle was taken to an independent mechanic, where it was test driven and diagnosed with transmission failure. The mechanic referred the contact to the dealer. The vehicle was then taken to the dealer, where the transmission fluid was flushed and replaced with HD transmission fluid per GM Technical Service Bulletin Number: 18-NA-355. The dealer then advised the contact to drive 500-1,000 miles to allow the new HD transmission fluid to circulate the transmission. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 22,589.

- North Bellmore, NY, USA

I have a 2018 Colorado 4x4 with 51K miles. Purchased with 28k. When driving at normal highway speed, get drive train shudder when increase torque is needed (hill, ramp, etc.). Only happens in overdrive. When tow/haul is activated shudder does not occur. It feels like transmission and/or drive shaft is about to fall off. I have not attempted repair due to numerous concerns voiced on this site and class action lawsuit now in progress. No warning lights or messages.

- Opelousas, LA, USA

I have the 2018 Chevy Colorado, I got it at 22k miles and it had a slight shudder, it got a bit worse so I brought in to a dealership and had the transmission fluid changed at 50k miles. It made it better but can still feel the shutter and a slight jerk while shifting yet

- Pulaski, WI, USA

when traveling at any speed usually between 1200-2200 RPM there is a rumble strip/ vibration feeling coming from the vehicle most notably around 35-45 MPH but happens at all speeds. I took it to my local mechanic and it was not a suspension, tire or drive shaft issue. i was informed it seems to be coming from the transmission. upon looking on other forums about this issue it seems to be a common problem with the 8 speed transmissions on the Colorado's. i still have been unable to fix this issue. No indicator lights are on, engine runs fine its only when traveling when the engine is between 1200-2200 RPM

- Smithtown, NY, USA

My 2018 Colorado Z71 (40,000 miles) suffers from transmission shudder intermittently. Dealer took it for a 14 mile test drive and was unable to duplicate. Blamed it on the tires. Refused to flush transmission fluid in accordance with GM TSB 18-NA-355. Shudder becomes worse when trailering boat. Known issue to GM, however, dealers refuse to perform the solution provided by GM in the absence of a recall.

- Sun City West , AZ, USA

problems shifting shaking and vibration at higher speeds very noticeable while pulling a trailer 11449007 reference number

- Poplar Branch, NC, USA