Engine And Engine Cooling Problems of GMC Sierra 2500 - part 1

I was driving my 2022 GMC 2500 hd (not towing, just normal drive) after an oil change <900 miles ago and new brakes/rotors 3 days prior <100 miles (total mileage 81,000, serviced exclusively at GMC dealership) when the loss of power alert flashed on the screen. I was 2 miles from my destination, going approx 55mph, so I kept driving to destination, when the vehicle stalled in driveway. As I was scrolling through menus to see the alert I looked up and smoke and flames were coming out of the engine. I attempted to extinguish with a fire extinguisher I had with me, but it was no use. The entire engine was engulfed, melting out, tires and windshield exploded from heat etc. Total loss. Vehicle was inspected by insurance CO fire investigator, no origin confirmed due to extent of damage. Vehicle was offered to GMC for their inspection as it was partially under oem warranty and I had an extended warranty from dealership, which I also notified. Extended would not do anything without the vehicle at GMC and diagnosis, which again, there is no engine etc so not repairable. GMC was to be in contact with insurance CO. No status update received.

See all problems of the 2022 GMC Sierra 2500 🔎.

The catalytic converter failed at 93,000 miles, and 64 months. Gm says it is out of warranty.

See all problems of the 2020 GMC Sierra 2500 🔎.

I rely heavily on this vehicle for my business and within 1 year of ownership, the vehicle broke down on the highway allowing it to only run @ 30mph. After finally locating a dealer who could evaluate the vehicle in less than 1 week, I was informed that the part was unavailable and they indicated, "it could take 1 month or 3 months to receive. " following multiple conversations, I was forced to open a claim with gm customer care. While trying to get information, I was, at one point, told that "although the code indicates failed transmission control module, it doesn't happen all the time and if I wanted to drive it I could come and take it until the part arrives. " that really told me alot about how gm representatives view safety while when it happened, I was on interstate and nearly got trounced by oncoming heavy traffic while pulling an equipment trailer. After the case was handed off to several gm customer care representatives, I finally rec'd feedback including several email updates. I finally rec'd the vehicle back after 1 month and was informed that 1) would receive car payment from gm & 2) would receive additional compensation for lost work time while my vehicle was out of service (Jan 2024). Since that conversation, I did receive 1 car payment however, never heard back from alisa regarding "lost time". I have sent several emails to customer care asking for an update however, crickets. Furthermore, the car has returned to the shop for another warning to "shift vehicle to park" when it was in park. They told me its a electrical malfunction but they could not get the error to come up on test. I have a photo showing the error.

See all problems of the 2023 GMC Sierra 2500 🔎.

My 2016 GMC Sierra 2500 with a 6. 6-liter duramax diesel v8 engine suffered a complete engine shutdown—an issue that is both hazardous and expensive to repair. Fortunately, mine failed in a parking lot. No warning lights or symptoms were present. Failure is instantaneous and can occur any time rendering the vehicle inoperable on high-speed highways, intersections, etc. Failure always leaves vehicle occupants stranded, creating an unsafe and dangerous situation. My vehicle was towed to a GMC dealer. Repair costs could be as high as $15,000. The 6. 6-liter duramax diesel v8 engine is equipped with a bosch ‘cp4’ high-pressure fuel pump. These pumps are unreasonably fragile and prone to catastrophic failure causing instant contamination of the entire fuel system with metal shavings. General motors has agreed to pay $35 million to settle with owners following a class action lawsuit that accused the company of installing defective bosch cp4 high-pressure fuel pumps in certain Chevrolet and GMC pickup models. This action covered only owners in California, florida, illinois, iowa, new york, pennsylvania, or texas.

See all problems of the 2016 GMC Sierra 2500 🔎.

The contact owns a 2020 GMC Sierra 2500. The contact stated that the vehicle was under NHTSA campaign number: 24v797000 (power train) and the vehicle was repaired. The contact stated that after the recall repair the transmission started shifting hard. The vehicle was taken to the dealer and the contact was informed that the transmission module would reprogram independently and adjust independently. The contact stated that a a week later while driving approximately 45 mph, the vehicle started to run rough, and the message engine power reduced was displayed. The transmission fault, parking brake system alert, service parking brake, and the check engine warning light illuminated. The vehicle was towed to the dealer who diagnosed the vehicle and determined that the fuel injector was open, causing high resistance in the connector for cylinder #4. The transmission could not be diagnosed until the injector was repaired. The manufacturer was informed of the failure and opened a case. The failure mileage was 125,000.

Blown head gasket. Engine hydro-locked.

See all problems of the 2015 GMC Sierra 2500 🔎.

Motor stopped dead while driving on a local interstate hwy. Was able to negotiate the truck out of traffic without crashing. Not an easy thing to do in speeding rush hour traffic. Had the truck towed to a reputable repair shop and discovered the cp4 fuel pump had failed and shattered throughout the fuel system. Repairs in the amount of $13,520. 30 incurred to get the truck back in service. The attached invoice includes $167. 87 for other maintenance not related to the cp4 fuel pump repair. This is a known problem and safely hazard. A class action suit settlement is related to the cp4 fuel pump against multiple truck manufacturers. . Read more...

024 GMC Sierra 2500 denali ultimate, which has suffered: •five catastrophic engine failures at highway speeds. •total brake failure, leaving the truck unable to stop. •severe electrical malfunctions, including flickering headlights at night. •retaliatory actions from general motors after I refused to waive my legal rights. I have documented proof, including gm’s own service records, emails, and a 7-minute recorded statement from gm’s highest-level technician, confirming that gm installed the wrong computer module (1500 series instead of the required 2500 series) in my truck. Additionally, I have evidence that gm executives instructed technicians to conduct diagnostics, take apart the engine, and reassemble it—but not repair the defect—after I refused to sign an affidavit waiving my rights. Due to these failures, I suffered a dislocated shoulder in one of the incidents, and my [xxx] daughter remains traumatized to this day. Given the immediate danger this defect poses to other GMC Sierra 2500 owners, I respectfully request that NHTSA open an investigation and consider issuing a recall before a tragedy occurs. 1. Engine failures since 3,000 miles – gm’s own work orders confirm issue since purchasing my 2024 GMC Sierra 2500 denali ultimate, I have experienced five catastrophic engine failures, all occurring while traveling at highway speeds (70 mph): •the truck suddenly lost power, dropping from 70 mph to 5-10 mph within seconds. •this created an immediate risk of being rear-ended or losing control on the highway. •gm’s own service records confirm that my engine issues began at just 3,000 miles. •gm dealerships misdiagnosed the issue four times, returning my truck to me in an unsafe condition. •the real cause was only identified after the fifth failure, when a gm-certified head technician finally determined that gm had installed the wrong computer module (1500 series instead of 2500 series). This means that for months, gm knew my vehicle w information redacted pursuant to the freedom of information act (foia.

See all problems of the 2024 GMC Sierra 2500 🔎.

The contact owns a 2020 GMC Sierra 2500. The contact stated while driving at an undisclosed speed, the accelerator pedal was depressed, and the transmission jerked. The contact stated that the transmission was skipping gear while shifting. The check engine warning light turned on and off. The contact received notification of NHTSA campaign number: 24v797000 (power train); however, the part to do the recall repair was not yet available. The local dealer was contacted. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the issue. The failure mileage was approximately 114,000. VIN tool confirms parts not available.

The contact owns a 2025 GMC Sierra 2500. The contact stated that while driving at an undisclosed speed, the vehicle failed to accelerate as intended while depressing the accelerator pedal. The check engine warning light was illuminated. In addition, the contact stated that the rpm was fluctuating while driving. The vehicle was towed to a local dealer however, the vehicle was not diagnosed or repaired due to the warranty. The manufacturer was made aware of the failure. The failure mileage was approximately 600.

The contact owns a 2021 GMC Sierra 2500. The contact stated while driving 40-55 mph, the vehicle started losing motive power. The contact stated while pulling into a nearby independent mechanic shop, the vehicle started jerking significantly and stalled midway. The check engine warning light was illuminated. The mechanic diagnosed the vehicle with transmission failure. The vehicle was towed to the residence. The local dealer and several unknown dealers were notified of the failure and informed the contact that the transmission assembly was not available and could not be ordered. The vehicle was towed to cj's transmission, where the transmission was taken apart. The mechanic determined that the transmission needed to be replaced. The vehicle was being repaired with a rebuilt transmission. The contact received notification of NHTSA campaign number: 24v797000 (power train); however, the part to do the recall repair was not yet available. The local dealer was contacted. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the failure and offered a modest monetary compensation for the repair. The failure mileage was approximately 134,000. Parts distribution disconnect.

See all problems of the 2021 GMC Sierra 2500 🔎.

The contact owned a 2024 GMC Sierra 2500 hd. The contact stated that after parking the vehicle at night and plugging in the engine block heater to a standard 110-volt outlet with an extension cord; 15-minutes later neighbors were screaming to the contact to exit the residence because the vehicle had caught on fire, and the residence was also on fire. The contact exited the residence and saw that the vehicle was fully engulfed in flames. The contact stated that the vehicle had disintegrated to the ground. The fire department was called and was able to extinguish the fires to the vehicle and the residence. The contact stated that the insurance provider and the fire department’s inspector linked the failure to the engine block heater. The contact stated that he was currently without a vehicle or a place of residence due to the fire. The contact stated that the police department was also on scene however, a police report was not filed. The contact stated that the remains vehicle remained in the driveway of the residence and the insurance provider was in the process of towing the vehicle away. The vehicle was deemed a total loss. The manufacturer was notified of the failure but had not offered any assistance. The failure mileage was 18,410.

I was driving on the interstate and had just exited to refuel. As I was re-entering traffic, I accelerated to merge, and suddenly, as I was about to pull in, I felt and heard a massive metallic crash, like the entire transmission had dropped. The engine sounded abnormal, and immediately, the dashboard flashed a warning: 'engine power is reduced. ' the check engine light came on, and I got messages saying the transmission needed service and to schedule an appointment. I called my dealership and took it in as soon as possible. After they held the truck for a while, the service manager told me a critical part was on indefinite backorder with no fulfillment date. He handed back my keys, saying they'd reach out when it arrived. I asked if it was safe to drive, and he said yes. Later, driving from illinois to California, my truck malfunctioned again. This time, in heavy, 12-lane traffic, the same loud crash threw me forward, almost slamming my face into the steering wheel. My wrists and shoulders hurt from bracing myself, and my right shoulder still aches. Again, I got the 'engine power reduced' warning and transmission service notice. Each time, this has put me and those around me in severe danger.

The contact owns a 2015 GMC Sierra 2500. The contact stated that while driving at 45-48 mph, the check engine warning light illuminated. The contact used a vehicle scanner and retrieved diagnostic test code p0420 that indicated an efficient operating below threshold, and the contact cleared the code. Additionally, the contact stated while the exhaust filter was being cleaned, an unknown message was displayed. Upon clearing the code, the check engine warning light illuminated again. The vehicle was taken to the local dealer, who informed the contact that there was no warranty coverage. The vehicle was not diagnosed or repaired.  the manufacturer was notified of the failure and referred the contact to the NHTSA hotline for assistance. The failure mileage was approximately 83,000.

The contact owns 2019 GMC sierra hd . The contact stated while driving 10mph the vehicle became inoperable and shut off independently . The vehicle was towed a dealer where it was diagnosed the fuel pump control module needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The approximate mileage was 33,000.

See all problems of the 2019 GMC Sierra 2500 🔎.

Smog system check and engan warning light keeps come on.

Defective valve body we took in our vehicle for issues with the engine. We were not able to drive it over 50 mph it only has 22,000 miles. The dealership has had the vehicle since August 13th. They have had the vehicle for 9 weeks. They said that neither them or customer [xxx] (case # [xxx]). Can locate a valve body, to replace the defective one. We were made aware that we had an issue when our check engine light came on. We proceeded to have a diagnostic done thru on-star. Then immediately took it to the dealership for repair. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

The contact owns a 2017 GMC Sierra 2500. The contact stated while driving approximately 75 mph, the vehicle started to jerk and vibrate abnormally. The contact stated that the "engine power reduced" warning light was illuminated. The contact pulled off the roadway and placed the vehicle in park(p). The contact depressed the accelerator pedal, and the vehicle was vibrating. The contact stated that the steering wheel was also vibrating abnormally. The contact had taken the vehicle to an independent mechanic, where it was diagnosed and determined that the injector connection was worn, causing the engine to misfire, and needed to be replaced. The vehicle was not repaired. The manufacturer was informed of the failure. The contact researched online and related the failure to technical service bulletin number: 23-na-027 fuel injectors (fuel system, diesel). The failure mileage was approximately 104,000.

See all problems of the 2017 GMC Sierra 2500 🔎.

The truck had 8 glow plugs replaced.

The contact owns a 2021 GMC Sierra 2500. The contact stated that the vehicle was equipped with an engine block heater that he plugged in to the vehicle when the weather was below 32 degrees to start the vehicle. The contact stated that he noticed that the engine block heater was causing the gfci outlet in his residence, to experience an electrical short circuit. The dealer was notified of the failure and informed the contact that it was a known failure. An appointment was scheduled for diagnostic testing. The vehicle was not diagnosed or repaired. The contact related the failure to NHTSA campaign number: 19v328000 (engine) however, the VIN was not included. The manufacturer was notified of the failure and a case was opened. The failure mileage was approximately 55,000.

2022 GMC siera 2500 diesel have code p20b9 and tailgate opening by itself.

Vehicle surges and stays at 1700 rpm in low range four wheel drive when accelerator pedal is touched dangerous situation if someone or something is in its path. Dealer is aware of the problem but is unable to repair, says it is inherent on those vehicles for the last couple of model years. (I can't safely hook up a trailer in low range 4x4).

The contact owns a 2019 GMC Sierra 2500. The contact stated while driving at various speeds, the vehicle lost motive power. The coolant fan seized and failed to operate as needed. There were no warning lights illuminated. The vehicle was towed to the local dealer to be diagnosed. The contact was informed that the check engine warning light was illuminated, and the knock sensor, coolant fan clutch, injector #6, and unstated wiring harness needed to be replaced. The dealer informed the contact that the parts to repair the vehicle were on back order. The vehicle was not repaired. The manufacturer was contacted and opened a case, but no additional assistance was provided. The failure mileage was approximately 87,000.

The contact owns a 2024 GMC Sierra 2500. The contact stated that while driving 30 mph when the check engine malfunction and electronic stability control system malfunction warning lights had illuminated. The vehicle had locked them out of the vehicle causing them to be unable to open their tailgate. The contact had to unplug their battery to lift the warning lights however the tailgate still failed to open. The vehicle had not been taken to the dealer, diagnosed or repaired. The manufacturer was not made aware of the failure. The approximate failure mileage was 1,000.

Truck is a diesel. Fuel pump blew up and died in the middle of the street. Now I'm being told the fuel system needs completely re done and will cost me 10g. I also found a lawsuit for this issue as well.

See all problems of the 2012 GMC Sierra 2500 🔎.

Vehicle is a duramax diesel engine with a cp4 fuel pump. The pump went out and the entire line/system has to be replaced. While driving the vehicle it lurched, made a noise then went to reduced power mode and shut off. Luckily we had just pulled off from a stop sign, if that happened and the speed of 55 it could of been far worse. Then engine would not restart and had to have vehicle towed.

Low coolant warning light came on. I was towing a travel trailer on a very busy roadway with no place to pull off while pulling a trailer. I had to pull over to the shoulder to check the coolant level and make sure I didn’t cause major damage to my engine by letting it overheat. While waiting to let the engine cool down, I researched and found that this is a very common issue with l5p duramax engines in gm trucks and it is specifically related to a faulty coolant level sensor. As it turns out, my coolant level was fine and there was no issue. The danger posed by me pulling over and waiting for well over an hour on the side of the busy backroad with my son in the truck was not a necessary one. It appears that this is a well known issue that is not being addressed by gm.

See all problems of the 2018 GMC Sierra 2500 🔎.

While driving down the highway at 60 mph, the truck stumbled then completely died. After coasting to a stop truck would not restart. Towed to a repair shop to find out the bosch cp 4 fuel pump exploded and contaminated the whole fuel system with metal shavings. A very expensive and lengthy repair. Gm has known there is issues with these parts, but has failed to recall and fails to cover repair costs. Other manufacturers using the same part have issued recalls. While I was able to safely the get vehicle to the side of the road, the failure could’ve resulted in an accident causing personal injury or property damage.

Check engine came on Sunday morning the code that through was p0 526 u062f. After calling the dealer and setting maintenance to be done one day later, the truck broke down while driving on the side of the road. The dealer is saying that the belt came off and the tensioner locked up doing damage to the fan clutch and connector. The case, because the code that ran is saying that the belt wasn’t going the speed that it was supposed to because the tensioner failed. The vehicle only has 55,000 miles on it.

The engine failed. The 2022 GMC denali had 12,000 miles on it. This was a brand new truck. We were driving home at night the engine began to make noise and then cut off in the middle of the road. We had to get the car towed. The truck was left on the side of the road on a very busy highway. The dealer confirmed the engine failed and found metal shavings in the engine. The dealer has recommended a new engine from the GMC manufacturer. The manufacturer has not yet responded to the dealerships request. The engine light did come on prior to the engine shutting off.

On December 29, 2022 I stopped at the bank for 2 minute and when I got back to my truck I noticed smoke coming out from under the hood. I immediately called 911 and luckily some nice people were able to get my hood up safely and the bank provided a fire extinguisher before the fire trucks arrived. It was engulfed in flames. The fireman said it appeared the fire started in the wiring at the engine. I had a recall fixed a while back for the engine block heater so I was worried maybe they didn’t repair the recall. A week after the fire I received a 2nd recall in the mail for the same recall. Today is July 9th and my truck is still in the shop waiting on parts that have been on back order this whole time. GMC told my insurance company they were sending someone down to look at it. Never heard anything back. This could have been so bad had I been driving it when the fire started. So here I am going on 7 months without my truck all while paying $942/month. I just want something to be done to speed up the repairs that my insurance has paid. Estimate is $22,000.

While pulling 35' 5th wheel down freeway, a message appeared in instrument panel telling me the fuel filter was at 0 percent and was going into low power mode. There happend to be an offramp there that I was able to get off the freeway. While making the turn on the offramp the truck died. I pulled over as far as I could whie coasting with no power steering or brakes, leaving truck & trailer partially blocking the offramp. Unable to start the vehicle, I immediatly contacted onstar and they dispatched the chp & tow truck. When chp arrived he asked when tow truck would be there. Without being able to confirm exactly, and due to safety concerns because of blocking the offramp, he called his own tow truck (rons towing) and forced me to move vehicle to safe location. The issue ended up being the injector fuel pump (cp4) that gm was well aware of going out and sending metal fragments throughout the fuel system. I've been told the pump was made in china and not to gm standards. The vehicle has been repaired, all work was covered under extended warrenty, this all could have been avoided if gm would have replaced the faulty fuel pump under recall. Had this happened 100 miles further on our trip we would have been going over pacheco pass in calif. Could have been a total disaster had we been going down the other side with no power steering & no power brakes pulling a 12,000 lb trailer in the dark.

Constant issues with glow plug failures, fuel rail failure, fuel pressure failure. Truck has been in the GMC service regarding these issues constantly for the last year with a total of five repairs and replacement of glow plugs with releaning learning new plugs and now the 6th return to the shop they’re tearing down the fuel system. Malfunction and engine light consistently come on with the same occurring problems generating from the fuel system and glow plugs. Fuel mileage is absolutely terrible and lose of power hazardous to safety!!! GMC has issued an extended warranty for 15 years and 150,000 miles, but cant and hasn’t found a repair for vehicle and just replaces the glow plugs just so they can fail again and again!!! they need to replace everything that needs to be done and if no fix they need lemon law the vehicle. This is ridiculous going back to the shop every two weeks I have my truck in the shop for a month to get it back, to put it back in the shop two weeks later, to have it back in the shop for a month. Since this start 17months ago I’ve only been able to put less then 7000 miles on the vehicle because GMC constantly has the truck! the is ridiculous when you’re paying $800 a month for your payment and insurance on your vehicle that you can’t drive because the manufacturer is constantly having to repair and replace the same thing over and over again.

I took my vehicle into the local dealership two weeks ago for the dpf emissions voluntary recall. Prior to the service I was getting 16. 6 mpg for the 42000 miles on my truck. After the service, for the ~200 miles driven on same route and conditions commuting to and from work I have only been able to achieve ~13 mpg. There has been no other changes to my vehicle or operating conditions. When I took the vehicle in the advisor mentioned that it may take awhile for the service because “we have to download the update wirelessly. ” while researching this issue the recall document specifically warns against wireless download of the update. I am not sure if this may be the result of not following the correct process or not and I am headed back to the dealer today. I also found several others posting on the diesel forums about similar significant loss of mpg after the update. Losing almost 25% fuel efficiency after the update is unacceptable and reflects the my previous experience of efficiency loss during an actual regeneration cycle prior to the update. The vehicle is acting as if it is running in a constant regeneration cycle. Unsure if this may lead to dangerous driving condition due to excessive stress and wear on the affected parts and engine.

Diesel exhaust fluid tank, high pressure.