Other Fuel System Problems of GMC Sierra 1500 - part 2

2020 GMC Sierra 1500 elevation 5. 3l engine. Lifter failure due do faulty design I’m afm/dfm systems.

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My truck is under the national recall from GMC for the 6. 2l engine problems. I even received the recall notice from GMC stating this. This truck has been in and out of the shop for engine problems things I took delivery of it in 2022. The latest was in April of 2025 and while it was in the repair service at the dealership, the national recall came out. During that time the dealership tried to tell me the problem was with my exhaust system so I was not covered under the recall. I knew they were not being truthful so I refused to take possession of the truck as I new it had all the symptoms that GMC was describing in my recall notice. My truck sat at the dealership for almost 5 months and last week they force me to take possession of my truck my taking back my "loaner vehicle". They stated "my truck passed the required inspection", which I knew they were being dishonest, but was forced to take the truck back anyway. Three days after taking possession I was on the interstate doing 60 mph and the engine totally seized up and almost caused an accident from the vehicles behind me running into me because of the sudden decrease in speed. I was able to safely pull over and had to get towed back to the dealership. This incident is beyond just a engine recall now because they new my truck was not safe to drive and forced me to take back my truck. Im just thankful I was driving and not my wife, or having my two grandchildren in the truck with me. To make mtters worse in this scenerio, this truck is actually my replacement truck because my 2021 truck had to be taken back per the lemon law in 2022, so this will now be truck #2 being lemon law and my original truck loan isnt even paid off. I have all of the various engine repair paperwork on this truck dating back to 2022.

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The vehicle has suffered repeated systemic electrical failures all while being under 8,000 miles. What component/system failed? power distribution/fuse block, starter, fuel pump control module, horn circuit, body control module, instrument cluster, and charging system. Error codes documented include p0627 (fuel pump control circuit), u0100 (lost comm ecm/pcm), b1325 (control module power low), u0140 (lost comm bcm), and b1000 (ecm fault). All repairs are documented by the dealer, and the truck remains available for inspection. How was safety at risk? the truck lost propulsion at speed, emitted smoke from the engine bay, and became disabled in traffic, placing my family, including my toddler, in immediate danger of collision and fire. Electrical defects also disabled horn and instrument cluster, removing critical warning and signaling functions. These electrical issues have been ongoing for months and gm refuses to replace and can't seem to fix it. Has it been confirmed? yes. Each failure was diagnosed and confirmed by an authorized gm dealer. Components replaced include fuse block, starter, fuel system computer, horn assembly, and cluster. Despite repairs, issues recur. Inspected by others? gm corporate case managers are aware and have acknowledged defects, though they have refused to issue written determinations. Insurance has not yet been involved, but records are available. The dealer has attempted to repaid more than 4 times with no success. Warning lamps/messages? yes. Prior to and during failures, vehicle displayed repeated “service electrical system,” “low voltage,” and communication fault codes. Cluster intermittently blacked out. Smoke in engine bay indicated immediate fire hazard. Cumulative out-of-service days exceeding 20. The failures pose unacceptable risk of fire, sudden propulsion loss, and loss of critical safety functions. I have all calls with gm recorded and transcribed as I am in SC (single party recording state) and can provide those.

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My 6. 3l v8 started having a slight misfire while driving. Took vehicle to a mechanic and was advised to change the spark plugs, changed spark plugs, spark plug wires, and ignition coil packs while still experiencing sudden misfires while driving. Starting to consider the 6. 2l l87 collapsing cylinder issue.

My wife and I were traveling on a county road and without warning, the vehicle skipped twice and cut off in the middle of the roadway in a sharp curve with rain threatening at approximately 7:30 p. M. Et August 11, 2025. I attempted to restart numerous times because we were in the middle of the right lane. The starter would spin but vehicle would not restart. The truck then would not shut off and draining the battery. I called for a wrecker and the sheriff's office to keep somebody from hitting us. Before the wrecker came, we connected a diagnostic device to the vehicle indicating it was the fuel pump module. 0august 12, 2-25, I called gm roadside assistance to be towed to closest dealership. The driver said he was familiar with a lot of gm trucks with the same issue. The vehicle has less than 12,000 miles and was purchased in June, 2024.

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My daughter and I drove to town to run some errands, we live twenty-three minutes away and take the freeway. Speed limit on that specific section of the freeway (i80) is 80mph. As I was taking the on-ramp to enter traffic, my GMC started shifted very hard and losing power. The vehicle was sputtering and making strange sounds. I was unable to exceed 60mph due to excessive vibrations/shaking the vehicle. Steering was starting to be difficult at the same time I noticed oil pressure gauge slowly dropping on instrument panel below 25psi. I had to pull over immediately. Oil pressure remained lower than normal, verified oil was filled to manufactures specifications (changed June 30, 2025). Returned the vehicle to my place of residence as safe and slow as I possibly could and parked it as it is a major safety concern.

On August 3, 2025 I was on the road enroute to my residence. With no warning my 2024 GMC Sierra 1500 slt engine quit. We heard a popping sound and the entire vehicle shuddered. I took safe control of the vehicle. As I intervened I noticed that the dash warning lights were lit. Almost immediately the warning lights went off and the engine restarted on its own. We were startled and extremely concerned about what had just happened. This was the first problem we encountered with the truck. I contacted the deluz chevy garage in hilo for a follow-up appointment.

Accelerating on highway and felt like the engine stalled. Coasted to a stop and the engine would not restart. There was no way to get the truck into neutral so it had to be drug onto a flat bed tow truck.

I own a 2021 GMC denali with a 6. 2l v8 l87 engine and 45,500 miles. I have confirmed the presence of metal shavings in the oil and oil filter, indicating that the engine is beginning to fail. When I took the vehicle to my local dealership, I was informed that there is currently no fix for this issue and was advised to continue driving the vehicle. This poses a serious safety risk—not just to me and my family but also to others on the road. A sudden loss of power could lead to a dangerous accident, and I do not want to be responsible for something preventable that could harm innocent people. My concern is that gm is aware of this engine issue but has instructed me to keep driving the vehicle, despite the known defect. How can gm be allowed to avoid accountability for such a critical safety matter? if a fatal accident were to occur, would the responsibility fall on gm or the NHTSA for failing to act? it’s also troubling that gm continues to profit by selling new vehicles, including the 2025 models, with similar issues, all while neglecting to provide solutions for affected customers like me. I purchased this $80,000 truck in good faith, but now no dealer wants to trade or buy these trucks without me taking a significant financial loss—something gm should be responsible for. As a taxpayer, I find it unacceptable that we bailed out gm in the mid-2000s, yet they continue to disregard accountability for their actions. I urge the NHTSA to take this issue seriously. A specific deadline should be set for gm to resolve this issue, and they should face daily penalties for every day they fail to provide a fix. If no resolution is possible, full refunds should be mandated. Please address this issue promptly, as it affects real people’s safety and financial well-being every day.

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Fuel tank leaking.

I was driving on the freeway and my GMC sierra at4 received a notification that I could could no longer accelerate. I pulled off to the side as safely as I could in a slanted hill in a major freeway with no shoulder. I sat on the side of the road for 45 min and then ran out of diesel gas waiting for the tow truck. We took into GMC and they said nothing was wrong, we were out of gas. But I ran out of gas waiting for the tow truck. The truck never shut off and ac still going, I just couldn’t accelerate. We’ve had the truck in the shop every single month for the past year for sensor issues and replacements and have all the documentation of the last few years of similar issues. No extensions of warranty’s nothing. Well we started to smell something burning this week and now we were told today we have a faulty fuel pump that will cost us $1,000 to fix and is not covered under our warranty. The truck is still under warranty, so why is something in relation to the power train not covered? there is a current t recall on other GMC models of this year for this fuel pump issue and the safety recall is exactly what happened to us on the freeway and the issue we have now. Why has this not been extended to other Gmcs????? my entire family could have died on the side of the freeway!!.

While driving on the highway at 70 mph, the truck experienced a harsh transmission shift followed by a sudden loss of acceleration and entered shutdown mode to protect the engine. The steering became stiff, all dashboard warning lights illuminated, and a message appeared on the driver display indicating a transmission issue and advising to drive with caution. The rpms surged and the truck struggled to maintain a speed of 45 mph while the remaining at 4000 rpm. This created an extremely hazardous situation for both me and my passenger. I safely pulled into the breakdown lane, came to a complete stop, shifted into park, and turned off the engine. Upon restarting the vehicle, the check engine light remained on, and the transmission continued to shift abnormally at low speeds, including noticeable shuddering.

See all problems of the 2025 GMC Sierra 1500 🔎.

This is the second time in 2 days!! while driving ~35mph the truck experienced a harsh transmission shift followed by a sudden loss of acceleration and entered shutdown mode to protect the engine. The steering became stiff, all dashboard warning lights illuminated, and a message appeared on the driver display indicating a transmission issue and advising to drive with caution. This created an extremely hazardous condition for me while driving on s busy stretch of road. I pulled onto the side of the road, came to a complete stop, shifted into park, and turned off the engine. Upon restarting the vehicle, the check engine light remained on, and the transmission continued to shift abnormally at low speeds, including some noticeable shuddering. My GMC application recorded the issue and reminded me to schedule service.

Subject: urgent vehicle safety complaint – 2019 GMC sierra denali escalating mechanical and electrical failures — many beginning before 100,000 miles, and continuing as of today, at approximately 110,000 miles. These issues have made the vehicle unreliable and unsafe to drive. Since purchasing the vehicle, I have had it serviced regularly and reported that it was driving rough, jerking into gear, and showing early signs of engine and transmission problems. These issues were noted during multiple multipoint inspection services, yet no lasting solutions were provided. Major issues have included: •engine performance failures •fuel injector malfunction •serpentine belt and idler pulley damage •a/c compressor belt failure •power steering malfunctions •vehicle stalling at traffic lights •loss of power on major highways •rear window water leaks •significant and ongoing electrical system problems •shaking when brakes applied after having brakes and rotors replace in March •screen monitor going out after paying over $ 900 dollars for updated software and repairs to the electronic component that cost over $2500. Despite continued maintenance, on Thursday, July 3, 2025, my truck began losing power and smoking heavily while driving on a busy highway in georgia. My grandchild, who was riding with me, yelled, “grandma, it’s smoking — please get out!” as we pulled off the road in fear of a fire. This terrifying incident left us stranded and emphasized just how dangerous this vehicle has become. I filed a formal complaint with the GMC corporate office, but no support provided or an investigation. Over the past six months, I have spent more than $5,000 trying to keep this vehicle operational. So many critical systems have failed, despite consistent maintenance, raises serious concerns. Finally, the fuel injector repaired 3 days later a message on dashboard displaying service tire monitor system and steering wheel shaking when brakes are applied.

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Fuel pump losses prime overnight. Gas sprays from fuel line onto top of fuel tank. Problem was brought to my attention by a repair shop. . Found several instances listed on youtube of this problem.

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Vehicle engine sputters/stalls. I see there is a fuel pump recall on some 2014 GMC sierra’s but mine is not on the list per your website.

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While in the parking lot of a local grocery store, I shifted the vehicle into reverse, at which point all dashboard warning lights immediately illuminated and the braking response became significantly weakened and nearly unresponsive. I placed the vehicle back into park, paused, and then attempted to shift into reverse again, but the dashboard alerts and brake issue persisted. This created a very unsafe driving situation because the brake system was very unresponsive. Despite the unsafe condition, I cautiously drove to my home 2miles away at a speed of under 20 mph, requiring excessive brake pressure to bring the vehicle to a stop. I parked the vehicle in my driveway and left it there overnight. The next morning, I tested the brakes, and they seemed to return to normal so I drove 5 miles to my local GMC service center. Service tech confirmed check engine light on and reported code p0700 and p00ff in the report.

Strong smell of gasoline nauseating, attempted to start vehicle intense spraying of gasoline all around gas tank vehicle started – dripping profusely around gas tank over chassis frame, rear driver side of vehicle 16 June 2025.

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Was informed from by gm that my vehicle is involved with a recall an still hasn't been repaired.

For approximately the last year (2024-2025) my 2020 GMC Sierra 1500 at4 with the 6. 2l engine has had noticeable ticking, knocking, and unprovoked shaking upon start up and idle. The pickup has stalled out at stop lights and intersections in the past, posing risk. In June (2025) the pickup was taken to a certified mechanic for inspection who suggested possible lifter or valve failure. The vehicle exhibits a persistent ticking sound from the engine, which I believe may be related to lifter or valve issues, similar to those reported in lawsuits against gm for 2019-2024 models and the recall for 2021-2024 models (NHTSA recall 24v-676). This ticking occurs regularly, including at approximately 54,500 miles, and raises concerns about potential engine failure or sudden loss of propulsion, which could be hazardous, especially at highway speeds. I have noticed approximately 2 quarts of engine oil usage per my last 2 oil changes (roughly every 6,000 miles). I recently had taken the pickup to a local gm dealership where they informed me that I am not longer covered under warranty and the recent recall is not applicable. I was advised to “keep and eye on it, and get a aaa membership”. I am aware of at least 10 class action lawsuits against gm for similar engine issues in vehicles like mine, suggesting a widespread defect. These issues, combined with the potential for engine failure or impaired vehicle control, warrant investigation to ensure driver safety. I have records of the ticking sound and can provide further details if needed. I am willing to cooperate with NHTSA for inspections or further documentation.

1. The vehicle’s emissions system is malfunctioning, specifically the ecm (engine control module) related to the exhaust emissions system. The diagnostic trouble code is p2c7a, indicating the system is not performing as expected. Key components such as the nox catalytic converters and diesel particulate filter have been repeatedly replaced, but the issue persists. The vehicle and all replaced components are available for inspection upon request. 2. The malfunctioning emissions system has led to an exhaust leak that allowed exhaust gases to enter the vehicle’s cab. This creates a hazardous environment for both the driver and passengers, exposing them to harmful exhaust fumes. In addition to reduced engine performance, poorer fuel economy, and emissions non-compliance, this exhaust leak poses a serious safety risk by compromising the air quality inside the vehicle. Prolonged operation under these conditions could lead to adverse health effects and further mechanical failures that impact vehicle safety. 3. Yes. The dealership has diagnosed the problem multiple times. The emissions components have been replaced under warranty on two separate occasions. The dealer attributed the fault to fuel quality; however, fuel distributor debunked these claims. 4. The vehicle has been inspected extensively by the dealership with invoiced repair work replacing key emissions control components. 5. The check engine light and service engine soon (ses) light have been illuminated with the diagnostic code p2c7a since the initial identification of the problem which started 3jun24.

I own a $35,000 2018 GMC Sierra 1500 6. 2l v8 4x4 denali, which is currently down due to engine failure while I was driving down the road. . Never had a check engine light on the dash. Haven't had the truck a year before it quit. Rods knocking, crankshaft bearings, loss of power, high rpm with little acceleration. I could have the peddle down to the floor and would barely get to 20 mph. . The motor would jump so bad, you would think it's going to jump out the truck. I have replaced several parts on the truck, including oil pump, filter, solenoid valve sensor, fuel pump, injectors, and sensors, battery, starter a couple times. Did all that replacing for it to get worse and finally quit while driving. . I was stranded in the middle of the road. . Iv reported it to the recall people, but nothing helped. I have taken my vehicle to express Chevrolet and they did a diagnostic test, which I provided the list they gave me below. When I took it to them, I was using endurance warranty, but they denied my claim due to the issues and they didn't cover them. At the time, the motor was still jumping, but smoke was coming out the tailpipe extremely bad, the truck was jerking and jumping. After replacing everything I listed, the truck got worse, started screeching and knocking loudly, loss of engine power, little acceleration. The day the motor quit on me while driving, I got the mph up to about 55-60 and it just quit, and hasn't started back since.

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I have not experienced a failure as of yet. But the cp4 fule pump is prone to fail. With that failure the engine is destroyed as well. So why is there no recall to get the cp4 fuel pump replaced? gm has been sued correct? a settlement of $35 million due to the failure of the cp4 fuel pump. So why is there no recall to address the issue before it happens? I have contacted gm directly and got no assistance. They just told me to fill a complaint. My vehicle is a 2016 GMC denali 2500 with the duramax motor. This issue needs to have a recall! why should owners of these vehicles with the cp4 fuel pumps have to wait until it fails and cost thousands of dollars to get assistance or reimbursement. Would appreciate any help with this matter. Thank you.

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On may 14, 2025 this vehicle was in blue cruise on I-12 in louisiana when it without warning coasted to a stop after the engine quit. Cruise lights remained active, no other lights were illuminated, and the vehicle simply rolled to a stop. La. Dot assisted. The vehicle was towed (complicated that once placed into park, and the engine would not restart, the vehicle cannot easily be placed in neutral to be towed). The vehicle was trailered some ~50 miles and sits at rainbow northshore GMC in covington, la. This is a series, life threatening situation that all vehicles need be removed from the road.

I was driving on a PA road at about 30 mph. My car stopped immediately and I heard the motor rev. The car then slammed into a stop.

Truck is starting to feel/act different. There is shaking at acceleration and deceleration. Idling is starting to fluctuate more at stop. Hoping to get this in for inspection. Dealer cannot do so with incomplete recall note on the vehicle.

I’m contacting you regarding my 2019 GMC Sierra 1500 with the 5. 3l v8 engine. The vehicle is currently experiencing a cylinder 8 misfire (code p0308), accompanied by engine backfiring, ticking noise, and exhaust fumes inside the cabin. Additionally, the esc (electronic stability control) warning light is on, and performance is noticeably affected. To date, I have: •replaced all spark plugs and fuel injectors •verified proper ignition coil function •had an oil change on September 23, 2024, during which I reported early concerns about engine performance (shortly after the powertrain warranty expired) •had a transmission flush on March 17, 2025, in an attempt to resolve continued drivability issues despite these efforts, the issue persists. Given the known issues with afm lifters and camshaft wear on this engine, I suspect a mechanical failure related to that system.

While exiting the highway and transitioning into a turn lane, my 2024 GMC sierra at4 (with 12,887 miles) suddenly and completely shut down without any prior warning. All vehicle systems—including electrical—failed simultaneously. This included the dashboard, steering assistance, and emergency lights, which significantly compromised my safety. I was unable to alert surrounding drivers or move the vehicle out of the traffic lane. There were multiple cars behind me, and I was placed in an extremely unsafe situation due to the sudden loss of control and inability to signal or restart the vehicle. I immediately contacted emergency services, and a police officer arrived approximately 10 minutes later to assist. Roadside assistance later pulled diagnostic code p0016 from the truck’s computer. I have since learned that this code corresponds to a known engine timing defect and is the subject of a recent GMC recall issued just days prior to the incident. The failure occurred without any warning lights, messages, or symptoms beforehand. The vehicle is now with a GMC dealer and is available for inspection upon request. To my knowledge, the issue has not yet been independently confirmed, but I believe it is directly connected to the recalled component.

The vehicle was purchased for the express purpose of towing a 6,600 lbs travel trailer. This truck is equipt with the 3 liter diesel engine. While towing the truck computer counts down milage available based on def level. The count down is not mile for mile it is an exponential count down. This factor triggers a series of warnings concerning vehicle operation and impending speed restrictions. 1000 mile def range warning is first up. Followed shortly there after with a 300 mile def range warning (700 miles had never been reached to trigger the warning). The next warning is "def low (red warning) speed restricted soon". Shortly there after a 500 mile count down starts for the first impending speed reduction to 65 mph max. This is followed by other speed restrictions that will put the vehicle eventually into a 5 mph speed restricted mode. When adding def to the tank the level has never been below 60% full. Its not empty as the gauge and computer indicate. With each filling of the def tank the range you can drive is less and less until the truck is driven without the trailer hooked up. Gm has a service bulletin for this situation that has been in place since September 23, 2024 and no permanent repair of solution has been prescribed. During the 500 mile count down to the first speed restriction the instrument cluster is locked out to only display "def empty" and alternately the def range counting down. No other safety features are visible such as engine temp or transmission temp important to know while towing. I purchased this vehicle March 17, 2025 stating my intentions to tow a travel trailer. The dealership no GMC ever made me aware of the service bulletin of the def restrictions. Had they done so I would have purchased a different vehicle with out the associated travel issues. Please reference gm service bulletin #24-na-196 document id 6736285. This document was given to me after my 4 visit to a GMC dealership to have the issue addressed.

The engine coolant flow control valve position sensor is faulty. I brought mt truck in to my dealership and I have been waiting for over a month to get the issue fixed because “the part is on backorder”. This issue makes my truck sound like a jet engine because it makes the truck think overheating and causes the fan to come on at full blast. After drivinf for awhile it goes into “ reduced engine power mode” which is totally unsafe because it reduces the horse power to that of a lawn mower. It takes about 30 seconds to get from 0-60, so merging onto freeways or in conditions where you need extra speed its completely useless and increases the scenario of being rear ended, immensely.

Unloaded my denali at huge loss with 30,000 miles because gm wouldn’t fix recall after many times in shop, broke down on freeway, and need to travel to canada on business. Canada won’t allow vehicles with open safety recalls to enter country even though im pretty sure engine was made in canada. Gm corporate office told me there’s nothing they can do. While in shop for 4 days of testing I watched vehicle on app, never started, moved, just put out back for 4 days then told absolutely nothing. Just wanted fair trade in for diesel. Truck looked identical to brand new on lot, 10/10 except engine recall. Gm promised to reimburse rental fees when broke down a week or so, submitted documents to gm, nothing recieved. Bought ram instead for obvious reasons. Is there a lemon law, class action, agency etc that can help compensate for losses? the public should be warned!.

Truck was traveling through atlanta when engine shut off and was not responsive. Was able to get truck off the interstate (i285 ramp to i75). Truck would not turn over. Pushed the onstar button, they stated they couldn't diagnose the truck. They called a wrecker and got truck to a local GMC dealer(capitol GMC). Truck was approx. 90 mile away from home. Dealer called on Monday 4/21 and stated that the engine was locked up and would need a new engine.

I leased a 2024 GMC Sierra 1500 denali ultimate with the 6. 2l v8 engine. The vehicle experienced multiple engine-related issues over time, including stalling on [xxx], and again in early 2025. On [xxx], the engine completely failed while I was driving on the highway. The truck suddenly shut down, forcing me to pull over in a dangerous situation. It was towed to north bay Cadillac, where they confirmed the engine needed to be fully replaced. They also stated this issue is related to a known engine defect affecting 6. 2l engines across gm vehicles. The vehicle has been in the shop for extended periods and is currently undergoing repairs estimated to take over a month. Gm provided a loaner vehicle after 12 days, but I remain financially responsible for a defective truck that posed a serious safety risk. No warning lights were present before the failure. I am requesting that this issue be formally documented due to the severity of the safety hazard and the widespread nature of this engine problem. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

While I was driving on highway, engine shut down and wouldn't restart. I needed to be towed.

I was about 45 miles or so from home on [xxx]. As I left a business my truck went about 100 feet and the engine stopped working . No warning. Truck was towed to a gm dealer in wilmington IL. It was determined the cause was due to the wiring from the engine ecm that was run over the top of a very sharp plastic mounting bracket for the ecm. The wire had been cut because of the way this was done at the factory. In addition the fuel pump also needed to be replaced . At the time of this, the truck had 39,140 miles on it. I had no warning this was about to happen. No check engine light went on , etc. Most of my route home is on the highway . Had this not happened on a side street , I would have been involved in an accident. I ended up paying $865. 42 plus towing for this repair I should not be paying for. The people at the gm dealer told me this has been happening on numerous gm pick up trucks. This is not a maintenance issue or an isolated case. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).