Gas Recirculation Valve (egr Valve) Problems of GMC Sierra 1500

1. On 05/9/25, the exhaust emissions system malfunctioned, triggering diagnostic trouble code p2c7a (exhaust emissions system failure). This repair, the seventh attempt since June 2024, addressed the same recurring emissions issue previously involving replacements of components such as the nox converter (02/18/25, 03/13/24) and egr valve (02/18/25). The vehicle is available for inspection upon request. 2. The p2c7a failure risks limp mode, reducing vehicle power unexpectedly, which is hazardous on highways, especially while towing. Exhaust emissions system malfunctions release excessive pollutants, posing environmental and health risks to others. 3. Yes, the p2c7a code was confirmed by dealer during the 05/9/25 repair, following prior confirmations (e. G. , 03/31/25–04/05/25. 4. The vehicle was inspected by young Chevrolet-Cadillac during multiple repairs (e. G. , 03/31/25, 05/9/25). 5. Yes, the check engine light and onstar emissions alerts appeared prior to the 05/9/25 repair, first noted ~June 2024 (p2c7a onset). Exhaust smell and reduced fuel economy were observed intermittently. Symptoms persisted post-03/31/25 repair, leading to the 05/23/25 service.

See all problems of the 2020 GMC Sierra 1500 🔎.

Engine light would come on for a few days and than turn itself off. This occurred for about 8/9 months; however, instructed by the gm maintenance department that if the vehicle came in and the light turned off before they got to it I would be charged for the diagnosis and no work would be performed. Engine light came on and I was able to park the vehicle / they picked it up and read it prior to putting in their lot until a tech became available. Gm maintenance was able to diagnosis that there was an issue with the egr sensor and nox catalytic converter without filter failed / both items replaced.

I had engine failure in June 2024 with roughly 50,000 miles. I was getting on i75 north in auburn hills, mi, when I heard a loud pop. The vehicle began shaking violently with a loss of engine power warning displayed, loss of oil pressure displayed followed by 2 successive limp mode warning. The vehicle would not drive over 25 mph. Luckily the next exit was only a mile down the road. I was able to drive on the shoulder of the interstate to get off of the highway. When I parked the vehicle shortly after, I viewed oil spewed all over the engine bay and under the truck. I then waited 4 hours in 95+ heat for a tow truck. The engine was replaced by the dealer with no root cause identified or communicated to me. There were no warning prior to this failure. The vehicle has had over 13 warranty related issues including the def heater melting, cac pump failure, numerous exhaust leaks, nox and egr sensors failing, brake control module faults etc.

While driving the vehicle home from work, the vehicle shut down in the middle of traffic on a street while stopped at a traffic light and would not move after attempting to put the truck in "drive". I had to call for an emergency roadside service (tow truck) which towed the vehicle to a GMC dealership service dept. I was told by the service technician that the transmission torque converter has disintegrated and it would cost over $5000 to repair. This vehicle did not provide any warnings (no warning signal displayed on the instrument panel) that the transmission needed servicing. I have owned this vehicle for 3 years. This vehicle needs reviewing for a recall.

See all problems of the 2016 GMC Sierra 1500 🔎.

While driving during winter conditions with temperature at 3 degrees on a residential street with limited traffic, the diesel fuel in the fuel filter gelled up which caused the vehicle to display reduce power mode and then immediately shut off and would not start. The vehicle coasted to a stop in the middle of the street while in traffic. The owners manual lists utilizing top tier diesel which I did. While additives are not normally needed in most states to fuel for freezing conditions evidently they are needed in oklahoma. The fuel filter housing is the only place where the fuel gelled up, which appears to be a theme in most GMC diesel trucks and does not effect fuel in the fuel tank due to volume. GMC has done nothing to improve the design or increase insulation to the thin fuel filter housing. If I had been in fast traffic on the interstate it would have resulted in an accident and possible loss of life.

See all problems of the 2021 GMC Sierra 1500 🔎.

At about 3500 miles lifters on two cylinders colasped. Took to dealer that dealer had three weeks but fixed it. 1500 miles later at 5036 miles it happened again on a different cylinder. Number 8. The first time it was 3 and 5. The first time the dealer replaced all 8 cylinders. So cylinder number 8 was new as well. GMC has said there is nothing else that can be done to fix the issue. The second dealer service manager states that he would not trust it either to go any long distance . Also stated that they have put 3 sets in to one vehicle before. As an ase master certified technician I find this disturbing. I also was a GMC,pontiac, Oldsmobile master technician. This is unexceptable for gm to think this is ok to take people's hard earn money and not fix there issues or make it right. I owned a 2014,2016,2018 silverado's that had no issues what so ever. To make things worst GMC road side assistance forgot about the truck broke down in 7 degree weather with 35 mile an hour winds. For over 24 hours and several calls back to finally get a supervisor to speak to. Two dealers say that it is unacceptable except the current dealer that is dealing directly with GMC. Anyone can do a search on gm truck lifters collapsing and you immediately overwhelmed with info. It is also disturbing that a dealership service manager says we could put a new engine in and the same thing could happen. That to me is poor quality control and poor customer service. I have always been a gm enthusiasts but this will be my last one. Horrible customer service and do not build a good product or stand behind it. Gm should be ashamed of there fall from grace. This all happened just driving once to work and once hauling a atv on a trailer.

I own a 2014 GMC sierra and the air conditioning condenser has gone out. This should be a recall since so many GMC & Chevrolet are having the same problem and no help is being offered to us. What a disappointment from GMC. If I would of been notified of this defect I would have never purchased these truck. Now I'm driving around in 110 degrees with my little son. Recall and fix this.

See all problems of the 2014 GMC Sierra 1500 🔎.

I've always liked your GMC trucks but mostly been a Ford owner so this December I bought a 2014 GMC Sierra 1500 with 98,000 miles. . . Really love the truck but then start by having problems. . First my passenger window wouldn't roll down all the way . . Got that fixed. . Then my rear drivers door lock don't work. . And the big one my ac condenser has a leak ($1500 fix)which supposedly is a common problem with this vehicle. . Which I'm just so dissatisfied. . I would really appreciated to have these problems fix for free!!! for I am regretting going GMC.

I purchased the vehicle pre-owned certified in late may 2017. Ac went out 1 week later. Vehicle has bumper to bumper warranty for 12 months or 12k miles. Vehicle was taken to folsom Buick GMC and found "a/c condenser leaking. . . Recommend replacement parts on order" part number 84211191. I was advised part was on back order. Going on 45 days with no ac, as the part is still on back order. In sacramento, CA where daily it is 90 degrees with many days over 100 degrees and some days over 105 degrees. As this is my only means of transportation it is a safety concern due to the amount of heat on the body while driving for extended periods of time. I always have to make sure I have enough cold water in the vehicle due to the fear of passing out from dehydration.

The windshield and the side windows of my new 2010 GMC Sierra 1500 wt, have an extreme tendency to fog over in temperatures near the freezing point. I have read, and observed, that the ac compressor becomes automatically disabled when the outside temperature gets near the freeze zone (I think the actual threshold is somewhere around 40 degrees f). With the ac disabled, the defrost mode cannot keep the windows clear. The problem is magnified when there are two or three individuals in the cab. At that point, it is exceedingly difficult to clear the side windows, even to the point that frost forms on the inside window surface! very recently, while traveling to work during my 40 mile commute, I was running the ac, with the temp control set to a comfortable level and the blower about the medium setting and flowing through the main vents. The outside temperature was, apparently, hovering near the point where the electronics disable the compressor. The windshield and both side windows fogged over suddenly. I noticed the ac light was out, so I switched to defrost mode and hi blower. The windshield did clear in about a minute or two, but all of that happened while driving down the turnpike at 70 mph. This seems to be a significant safety concern. . . . At least for me and my family. If the ac compressor had stayed enabled, this would never have happened. It is very difficult to stop condensation buildup if you cannot run the ac to dry the cabin air. This design configuration seems to present an issue of safety. I am not sure if it is just this particular model. I suspect so, since it is the base model truck. We have a 2011 GMC terrain, which does not present this issue. I have contacted the dealer about this issue now for 3 years with no resolution. They act as though you are an idiot.

See all problems of the 2010 GMC Sierra 1500 🔎.