I have an on going problem with the emissions system on my 2021 Tahoe. The vehicle discharges raw diesel fuel and DEF from the exhaust tail pipe during cold startup. This discharge is overwhelming and is so strong it can be detected by smell from over fifty feet away. In addition to this issue the fumes enter the inside of the vehicle and at times it is so bad you need to open the windows. I believe this problem is unsafe as it poses a fire risk and a CO exposure risk to the vehicle occupants. The vehicle has been in the shop repeatedly for the past eighteen months with various parts replaced. To date none of the repairs have fixed the problem. In February GM issued a statement saying that this is normal operations.

- Anacortes, WA, USA

without warning the engine shut off and lost power while driving. the engine light came on. i was able to pull over to the side of the road. I'm glad I wasn't at interstate speeds, that would of been bad. It was like i ran out of fuel. it was the fuel pump power control module according to the dealership.

- Hahnville, LA, USA

See BBB complaint #18695782 filed 1/6/2023. See NHTSA ID# 11500111

- Naples, FL, USA

Car stalled while driving on the highway, no warning, car became unresponsive and we almost had an accident attempting to move car off the highway. This was an extreme safety risk. Car was dead, unable to start. Towed car to dealership, told it was the fuel control module that was not working. Found out this was a known issue for 2021 Tahoe, no recall was issued for my vehicle, no one notified or warned me of the risk.

- Winter Garden, FL, USA

On November 9th, 2022 my wife was returning from the store when our Tahoe lost power and the engine shut off. She was able to pull off the highway onto a side street prior to the engine shutting off. I met her at that spot to see what was going on with the vehicle. The car was parked on a slight hill and after checking the oil and other fluids I could not see an issue with the car and the car would still not start. I was able to tow the car to a flat spot and checked the fluids again. After about 45 minutes the car did restart with the check engine light on. We were able to get the vehicle to an auto shop about a 1/4 mile down the road where they were able to hook up their reader and see what the check engine light was for. A code of P129F came up which is the fuel pump module, pictures attached of screen. We then were able to get the car home and it was towed to a Chevy dealership the following day. There techs were able to find a recall number of 21V739000 which was issued on 9-23-2021 showed that this happened in certain 2021 Tahoe's. While our vin number did not fit into the vin numbers on the recall number I still feel this was the issue. I feel this could be a bigger safety issue with other vehicles on the road that did not fit into that recall could still have the issue. While we were lucky and know one was injured the next people may not be so lucky. Also since our Tahoe was not in the range of VIN numbers on the recall we are being forced to pay out of pocket $521.81. Which I will be fighting Chevrolet to pay us back.

- Soldotna, AK, USA

Recently, while idling in parking space the vehicle stalled and engine and fuel lights came on. The vehicle was towed to the nearest dealer, and the diagnosis was a failure of the fuel pump control module. The vehicle has less than 10,500 miles. The dealer stated that over the last four days, two other vehicles were brought in for the same issue.

- Naples, FL, USA

First fuel system failure occurred at ~3500 miles. Pulled out of driveway, shifted into drive and vehicle stalled and would not restart. Fuel pump replaced first then fuel module replaced resolving issue. Now at 12,100, vehicle again shut down at a major intersection and would not start. Vehicle has been towed to dealership. The vehicle failure mechanism locks the car in park and leaves all electronics powered on. Fortunately I was able to get the front wheels strait during one sputtering start attempt so it could be DRAGGED straight onto the tow truck. Able to power off radio and ac buT no other electronics would shutdown, dash display, resulting in total battery drain. Can only lock drivers door with key so vehicle is outside dealer service center on a weekend unlocked. This the second failure of the same component. This abrupt failure creates a completely unsafe situation leaving you stranded unable to move. This vehicle is an expensive failure and based on a second recurrence, the related electronic component issue has not been resolved. First occurrence Chevrolet provided a free year of OnStar due to me not feeling safe with this vehicle. Now just after this expired, the same failure has occurred. Buy this vehicle back from me Chevrolet at my purchase price. First occurrence took 3 hrs for a tow truck to pick up the car which was fortunately in middle of my street. This current failure was 2.5 hrs stuck at a stop sign in the middle of a major intersection. Thank God I was not on the interstate.

- New Orleans, LA, USA

INTERMITNLY STALLS WHEN DRIVING at dealer now being addressed no warning light before issue happened three times now starting in April

- Bedford, MA, USA

I encountered the same issue which most of the other complaints on here saw where the engine lost power (due to one cylinder misfiring) suddenly and it was due to a faulty lifter in the engine. Fortunately, I was able to limp the vehicle back to my house where it could be towed, but had it been worse it could've stalled in an intersection and I'd be unable to move the vehicle due to how the engine must be running in order to put it in Neutral. GM really needs to recall the engines that are affected by the lifter problem as this issue is showing up on several forums online along with this site. My engine date code falls within their TSB, however they only replaced one bank due to my mileage being over 8,000 miles. That means that I most likely get to look forward to more issues soon with the other bank of lifters as they're of the same faulty design.

- Cedar Falls, IA, USA

This model engine stalls/cuts out acceleration because of valve lifter problems. While Chevrolet has repaired many of these engines, they are waiting until the check engine light comes on (or flashes) to initiate the warranty repair. It is very possible to be miles from a dealer, requiring a tow, and the dealer not having the repair parts in stock.

- Jackson, WY, USA

After turning off a major highway (65 mph) onto a side road after driving for approximately eight hours, the transmission shifted into N...on its own. The engine continued to run but the vehicle would not move. We could not shift into P, R or D. When attempting to shift into P, R or D, an error message appeared on the dashboard that said "Conditions not right for shifting." We turned the vehicle off and then back on and the error cleared. The vehicle continued to drive "normally" for another two hours and the end of the journey. Had this happened in the middle of heavy traffic, a deadly accident could have occurred. Mileage on vehicle is 4,900. Date: 13 July 2021 at 1800 hours. Dealer has been notified but has taken no action to date. There were no warning signs or messages prior to the incident. I'm guessing it is a sensor or software problem related to the engine/transmission. There is a paragraph in the Owner's Manual that states: "Under certain conditions, propulsion will be disabled. Try restarting after the ignition has been off for two minutes." It offers no other explanation as to what "under certain conditions" means.

- Bellevue, NE, USA

On July 3, 2021 approximately 2:00pm EST. Left to go out of town, had driven about 50 miles. Stopped to top off fuel. Left station for fueling stopped at red light to turn left to get back on interstate. The vehicle stuttered, stalled, and would not restart in middle of intersection. Hazard lights put on nearly hit by other vehicles. State trooper had to get behind vehicle to let other know of hazard. Towed to nearest dealer. Onstar diagnostic revealed fuel management system and transmission. Dealer hasn-€™t contacted but service advisor from GM notified me it was fuel pump.

- Greenville , SC, USA

We have owned this 2021 Chevrolet Tahoe for a little less than a year. Since acquiring this vehicle, there have been multiple safety recalls and we have had to get the vehicle serviced 3 times due to electrical issues. Now for the major safety issue, was out of town waiting at a red light in a turning lane. As we were waiting, the Tahoe spontaneously turned off. All of the indicator lights on the dashboard were illuminated and my husband tried to restart the car but the engine just kept turning and the car would not start. We put the hazard lights on and wanted to get the vehicle out of the road where there was active traffic. However, the vehicle was unable to be shifted to neutral so we were stuck and also important to note the hazard lights were not working. We towed to the nearest dealership and tow driver had to apply WD40 on the ramp to get the truck off since it wouldn't shift to neutral. At the same time, my husband received an email from OnStar "An issue with the Engine and Transmission System in your 2021 Chevrolet Tahoe has been detected." Now being told by dealership this was caused by a fuel pump module cut off, causing the car to go into "limp mode" so who knows what is true. I do not feel safe driving this car nor having my kids in it. This would be a very different conversation if this happened on a highway. This vehicle should be recalled because someone gets killed.

- Land O Lakes, FL, USA

May 6, on vacation, sudden engine failure, valve lifter and lifter rod. GM told dealer only to replace lifters on one side, Cyl 5 was problem. May 24 car ready, pickup and 68 miles later same problem while on I95 in SC. Did not trust engine and drove in right lane. GM played Russian roulette with our safety and that of other people on road. Sudden engine failure can result quickly in accidents with possible casualties at highway speeds. After pulling of I95, called GM Road assistance. Towed to dealer. They were of no help. Family member from CHS, SC send trailer to bring us all the way home in New Smyrna Beach Fl. While on phone with GM Road assistance we idled the engine to keep cell phone charged. Suddenly engine stopped and on restart heavy smoke came from tail pipe. May 25 car delivered to dealer in NSB where we bought car. May 27 they informed us same lifter/rod problem occurred on other side. Look at Chevroletforum.com and you will see 2021 6.2 engine having these problems within 8000 miles. Have been in contact with GM customer Assistance Center since May 14. We do no longer trust this engine. GM already decided to redesign the lifters as they are aware of the problem. NO recall has been issued yet. Consider this a serious highway safety issue. Do not consider the car a lemon, but yes the engine sure is.

- New Smyrna Beach, FL, USA