2020 CHEVROLET SILVERADO 1500 Fuelpropulsion System Problems

What happened: In mid-December 2025, my 2020 Silverado 1500 (VIN: [XXX] ) suffered a catastrophic failure of the DEF Tank Assembly (P/N 84914535) at 29,354 miles—less than 30% of its warranted life. This is a latent design defect involving undersized terminal pins that suffer thermal degradation and melt the connector during high-amperage heater operation in arctic conditions (Ref: GM TSB 21-NA-006). Component Availability: The failed assembly is held at the dealership. I have submitted a "Part Preservation Request" to ensure it is available for forensic inspection by federal regulators. Safety Risk: The failure triggers an EPA-mandated "Limp Mode," initiating a software-forced reduction in speed. Unexpectedly losing speed on high-speed, icy Alaskan highways—where roadside snowbanks prevent safe egress—creates an extreme risk of rear-end collisions. Furthermore, a vehicle restricted to 5 MPH or rendered inoperable in temperatures of -30°F to -50°F poses a direct, life-threatening risk of cold-weather exposure in remote areas....

Engine idling rough shaking stalling loss of power

Our truck would not start, we had to have it towed twice. We had a s Diagnostic run and the code was for the fuel pump. We had the truck towed to a local mechanic and they mentioned the open recall on fuel pumps for our make, model and year. We tried to schedule the appointment at the dealership for recalls, but our VIN was not on the list.

When it gets hot it'll lose power at the pedal and it will randomly come back causing the drive train to jerk back and forth throwing full related codes that go away once the truck has cooled off. Took it to a shop and they couldn't get it to throw a code. This will be the third time it has happened. This time it doesn't throw a code

Lose of power at the pedal again not even 15 mins later. Still no code. Just extremely frustrating

Shop has had the truck over two months and cannot figure out the problem will not go stuck in limp mode.

My husband was driving our family truck onto the highway to merge into traffic, when he lost all engine power, several dash lights turned on, and a clanking noise started. This was an extremely dangerous situation because the truck stalled, while trying speed up into highway traffic. He swerved to avoid cars and pulled off to the right shoulder. This a major safety issue because if either of my teenage daughters had been driving the truck, they would likely not have been able to avoid an accident! Mechanics confirmed the truck had suffered a catastrophic engine failure while driving. The dealership confirmed a lifter failed causing the damage. They said the whole engine had to be replaced. GM offered to pay half of cost, proving they know this is an issue. The truck's not even 5 years old, so the fact that engine would just stop while driving, when we...

I am reporting an issue with a 2020 Chevrolet Silverado 1500 equipped with the 3.0L Duramax diesel engine. The vehicle experienced a failure of the NOx Sensor Position 2, which significantly impacted performance and emissions compliance. GM previously issued Emission Recall N212351211 (March 7, 2023) for other diesel Silverado models regarding improper ECM detection of NOx sensor faults. The issue in my vehicle appears functionally identical, yet this engine and model were not included in that recall. The sensor was replaced and reprogrammed at a Chevrolet dealership at the owner's expense. After contacting Chevrolet, a customer retention check was provided, covering roughly half of the total cost. While appreciated, the remaining cost burden remains significant. If this model is eventually included in the recall, it may allow for full reimbursement and support for other affected owners. Online forums show that many 3.0L Duramax owners are experiencing similar failures, suggesting this...

I am reporting an issue with a 2020 Chevrolet Silverado 1500 equipped with the 3.0L Duramax diesel engine. The vehicle experienced a failure of the NOx Sensor Position 2, which significantly impacted performance and emissions compliance. GM previously issued Emission Recall N212351211 (March 7, 2023) for other diesel Silverado models regarding improper ECM detection of NOx sensor faults. The issue in my vehicle appears functionally identical, yet this engine and model were not included in that recall. The sensor was replaced and reprogrammed at a Chevrolet dealership at the owner’s expense. After contacting Chevrolet, a customer retention check was provided, covering roughly half of the total cost. While appreciated, the remaining cost burden remains significant. If this model is eventually included in the recall, it may allow for full reimbursement and support for other affected owners. Online forums show that many 3.0L Duramax owners are experiencing similar failures, suggesting this...

On Feb 10, 2025 while in busy mid-day traffic on the highway going 55mph my vehicle without any warning signs or warning messages on dash, or dash indicator lights suddenly went into limp mode , began making a loud knocking from the engine, and started shutting down. I stopped the vehicle as soon as I safely could do so and had it towed back to the selling dealer for them to diagnose the issue. The dealer then informed me that i had a bent lifter on the left bank but they did this based on codes and not any tear down. They referred me to another local dealer. I had my vehicle towed there where they also stated lifter. Once they began to replace the lifters on the left bank scarring was found on my #3 cylinder wall and at that point I was told that my truck had catastrophic...

On January 17, 2025, I was approaching the entrance ramp unto Interstate 10, traveling along at approximately 40 miles an hour, when all of a sudden I noticed that my vehicle started decelerating as I was pressing on the accelerator, trying to merge onto oncoming traffic. The engine started shuttering and vibrating violently! I noticed all the warning lights, gauges and indicators had come on simultaneously! There was a loud clicking sound coming from the engine compartment and backfiring coming from the exhaust. I evaluate the situation at hand and conduct a risk assessment of trying to continue on with this problem but decided to move over to the median. I was almost run into from the rear due to lack of power in which I felt would have been the result of my truck just losing power without any warning. I drove my truck to a Chevrolet dealership after...

Vehicle purchased December 2020 Flashing check engine light that stays on- light did not stay on long enough for dealer to see, said they couldn't find any issues. The first time we had it towed and when they looked at it the light was no longer on. They were able to tell us what was going on with the vehicle when the light came on but said there were no problems. Flashing check engine light that turns off- "no light = no problem" dealer says. Eventually they printed pages showing engine misfires which we were initially told was no big deal. Later I was told I should get spark plugs changed, which I did. So far, flashing light has not reoccurred. Burns 3 or more quarts of oil between oil changes which I was assured by more than one rep that that was normal (on numerous occasions). Air conditioning quit...

Fuel pump module failure. Car stop working while driving. Immediately downshifted to a lower gear and would no longer drive above 10mph without shutting down

The contact owns a 2020 Chevrolet Silverado. The contact stated that while driving at an undisclosed speed, he heard an abnormal sound emanating from the rear end suspension. No warning lights were illuminated. The vehicle was taken to the dealer, who determined that fuel leak from the fuel delivery system resulted corrosion of the left side leaf spring grummet. The vehicle was repaired. The manufacturer was not notified of the failure. The failure mileage was 30,000.

Engine light came on, service park brake light came on, truck started jumping and misfiring, code says cylinder 5 misfire.

Total engine replacement at 62k. The junk lifter system government regulation has compromised our Vehicles. Active fuel management systems are used expensive trash changes to our American motors that generate extreme hardship for single vehicle owners.

Check engine light came on, I plugged my code reader in and was given P0498 ERROR CODE. Upon doing research and calling around to 3 different Chevrolet service centers I was told that it is a know issue with the fuel pump control module on all gm trucks. I am part of a truck group of over 150 and 85 of us has had this issue and all are currently waiting for the part to come in which is back ordered over months. Why has there been no recall and service bulletins yet if all 3 of the service managers agreed of the known issue.

fuel pump control module (13540028) went out no open recalls however they are national back order with no eta so this is an ongoing issue... SO NOW NO TRUCK FOR MONTHS AS THEY TELL ME ITS ON INTERGALATIC BACK ORDER.

Check engine light came on. Authorized Dealer Advisor stated "vehicle may shut-off or not start." Took to Authorized Dealer. Dealer found Evap System Error Code P0499. Dealer replaced Evap Valve Harness Connector. Approximately 48hrs Check Engine Light came on again. Will schedule service with Authorized Dealer.

While driving the engine jumps/jerks then goes back to normal, it continuously happens every 3-5 minutes while driving. A friend had his exact issue with exact make model year vehicle and it ended up being the gas sensor. Please look into this issue for this vehicle. Our local dealer will not fix it because the sensor doesn’t show the issue but that is the issue. The dealer knows it does it but won’t fix it.

while driving i smelled what i thought was strong exhaust from a vehicle in front of us. It was actually gasoline fumes entering the cab from my truck's engine compartment. I pulled over and investigated the smell, we had to let down ALL the windows and turn off the AC. There were no warning lamps. There was, however, gasoline dripping from around the transmission area of the underside. It was dripping on the exhaust which was causing most of the stench. It wasn't a heavy drip but enough for me to skip any other planned errands. When we got to the house gasoline was dropping from six or seven places under the car. The next day we set an appointment for the dealership to look at it. When I drove into the dealer the car was still gushing gasoline and I told them about the recall for the High Pressure...

Vehicle didn't start; got stranded. Tried to jump start with another vehicle. It turned, but didn't turn on. Had it towed to mechanic (closed on Sunday). Was lucky to be in an area I was familiar with during the day and not traveling over 250 miles the following day with family at night. Mechanic called Monday and stated fuel pump has to be replaced after a diagnostic test. 2020 Chevrolet Silverado @ 50,000 miles

My truck had been randomly misfiring but the dealership couldn’t resolve the issue because the check engine light would go away on the way there. They were able to pull codes showing a misfire taking place and told me to return if it continued. The truck started having misfire issues again periodically fir the next 2 weeks but once the check engine light stayed on I scheduled an appointment. On the way to the appointment to Hidiburg Chevrolet we were on the interstate the cruise control kicked off, the service parking brake indicator, misfire flashing of check engine light, an ESC warning, and the traction control light came on as the truck randomly pulled to the right real quick then it stopped. Once the indicators went off all warning indicators were off and cruise control would not work. The dealership pulled codes and saw every cylinder misfired and that the...

High Pressure fuel pump failed external fuel leaking onto exhaust of truck. Lucky the truck didn't catch on fire. Would have if I kept driving. What component or system failed or malfunctioned, and is it available for inspection upon request? High Pressure fuel pump (external leak) under GM warranty they have the parts. Flannery Chevrolet Bad Axe MI How was your safety or the safety of others put at risk? Gas leaking on Hot catalytic converter and cross over pipe. Skid plate was full of fuel. A fire under the truck would have made it very difficult to get out of the vehicle once stopped. Has the problem been reproduced or confirmed by a dealer or independent service center? Towed vehicle to dealership and they diagnosed High Pressure fuel pump leaking. they replaced the pump and appears to he resolved now. Has the vehicle or component been inspected by the...

I WAS STOPPED N THE DRIVE THRU AT IN-N-OUT WITH MY FOOT ON THE BRAKE AND THE ECO SYSTEM HAD TURNED OFF THE MOTOR. IT SPONTANEOUSLY TURNED BACK ON WITHOUT ME LIFTING MY FOOT OFF OF THE BRAKE AND THE TRANSMISSION ENGAGED AND THE TRUCK LAUNCHED FORWARD APPROXIMATELY 12-18 INCHES. THIS IS THE SECOND TIME THIS HAS HAPPENED TO ME. IT ALSO HAPPENED ONE NIGHT ABOUT 2 MONTHS AGO. THIS COULD HAVE BEEN VERY DANGEROUS, I COULD HAVE HIT SOMEONE OR THEIR CAR OR I COULD HAVE EVEN RECEIVED WHIPLASH MYSELF. *TR