2021 Gmc Sierra 3500 problems

Overview of popular issues
Analysis of common problems
Сomplaints list
Recalls list

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Common 2021 Gmc Sierra 3500 problems

Based on the information gathered from the sources provided, here is a list of common problems reported by owners of the 2021 GMC Sierra 3500:

Brake Problems:
- Owners have reported issues with the brakes in the 2021 GMC Sierra 3500. Specific details on the nature of these problems are not explicitly mentioned in the search results, but brake issues can encompass a range of concerns such as brake failure, squeaking or grinding noises, soft brake pedals, or uneven braking.
Fuel System Problems:
- Complaints regarding the fuel system of the 2021 GMC Sierra 3500 have been highlighted. While exact details are not provided, fuel system problems can involve issues like fuel leaks, fuel pump malfunctions, poor fuel efficiency, or difficulties starting the vehicle due to fuel delivery issues.

These problems, especially when left unaddressed, can pose safety risks and affect the overall performance and reliability of the vehicle. It is crucial for owners experiencing these issues to promptly address them by consulting with authorized service centers or mechanics to ensure the proper functioning and safety of their GMC Sierra 3500.

Do 2021 GMC Sierras have transmission problems?

Still, over the years, especially with later models from 2014 to 2021, most owners, especially those with automatic transmissions, have complained about GMC Sierra's transmission. They claim that the transmission started misbehaving before the car reached 100000 miles.

Is there a recall on 2021 GMC Sierra?

General Motors (GM) is recalling certain 2019-2021 GMC Sierra 1500 and Silverado 1500 vehicles equipped with certain accessory road tires and a 17" spare tire.

Is Sierra 3500 reliable?

GMC Sierra 3500 Reliability Problems. Sierra 3500 owners have made 25 complaints over 29 model years. Using our PainRank™ system we've ranked it 1st in overall reliability out of 15 GMC models , with real lights and brakes concerns.

How many miles per gallon does a 2021 GMC Sierra 3500 get?

Based on data from 36 vehicles, 2,639 fuel-ups and 883,667 miles of driving, the 2021 GMC Sierra 3500 HD gets a combined Avg MPG of 13.83 with a 0.16 MPG margin of error. Below you can see a distribution of the fuel-ups with 12 outliers (0.45%) removed.

Is Sierra 3500 reliable?

What is the brake issue on the 2021 GMC 3500?

The bolts that attach the brake pressure modulator valve (BPMV) assembly may not be properly tightened, which could fail to seal the two sub-assemblies and allow water intrusion.

Do 2021 GMC Sierras have transmission problems?

Are there any recalls on 2021 GMC Sierra?

Summary: General Motors (GM) is recalling certain 2019-2021 GMC Sierra 1500 and Silverado 1500 vehicles equipped with certain accessory road tires and a 17" spare tire.

2021 Gmc Sierra 3500 car problems categorized by type of issue

After analyzing all complaints sent to the NHTSA and researching popular Gmc Sierra 3500 problems, we found that the most common problems with these 2023 model year vehicles are:

Power train problems
Service brakes problems
Fuel/propulsion system problems
Engine problems
Tires problems

The graph below shows statistics for all 2021 Gmc Sierra 3500 vehicle components and the number of complaints received.

2021 Gmc Sierra 3500 complaints

The NHTSA has received 10 complaints about various vehicle components related to the 2021 Gmc Sierra 3500.

2024-10-01

POWER TRAIN PROBLEM

Date Of Incident: 2024-08-09
VIN: 1GT49WEY9MF
Components: POWER TRAIN
Summary: While driving 55mph on a 2 lane road, pulling a 5th wheel camper, the truck transmission downshifted by itself to a low gear. This caused a scary and immediate deceleration from 55 to 25mph. The trailer wanted to push into the oncoming lane the deceleration was so fast. The truck is at a dealership and they acknowledge the issue but not a fix other than putting back in the failed part. There was no warning and my readings say many others are having same issue. The small dealership we left the truck with (yemm Chevrolet in Galesburg Il) said they had 3 trucks with the same issue. The truck has been with the dealership for 7 weeks now.

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2024-04-19

SERVICE BRAKES PROBLEM

Date Of Incident: 2024-04-19
VIN: 1GT49VEY1MF
Components: SERVICE BRAKES
Summary: When starting the vehicle, I got a message to service the parking brake (this is the second time I’ve had this warning appear in the 21,000 miles I’ve owned it, first was approximately 5,000 miles ago). When this warning is active the parking brake does not engage, and can’t be used to stop the vehicle when the brakes fail as they did today. With 42,774 miles on the vehicle, and the onboard monitor for brake wear showing remaining brake life at 94% front and 96% rear, brake fluid reservoir between Max and Min the brake pedal went soft and the vehicle would not stop. I resorted to putting the vehicle in neutral and pumping the brakes until the pedal got hard. As soon as I let off the brake my vehicle began to roll backwards, stepped on the brake pedal again and the pedal again went to the floor without stopping or slowing the vehicle (pumping the brakes got it stopped again inches away from running into my house). The myGMC app notified me that I need to service the ABS system. I had the vehicle towed to the dealership for diagnostics and repair. Possibly related, this afternoon before the brakes stopped working I felt a mild vibration when traveling 20-35mph that resembled the vibration that occurs when a wheel bearing has begun to fail. Tow truck driver witnessed the vehicles inability to stop when putting it in neutral to load vehicle. It is unimaginable that a vehicle can be placed on the highway that has no backup system in the event of brake failure. Had a kid run out in front of me there would have been no way to avoid the accident (no other warnings appeared to indicate the vehicle was unsafe to drive. Brakes worked correctly and stopped appropriately until they didn’t).

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2023-05-24

TIRES PROBLEM

Date Of Incident: 2023-04-30
VIN: 1GT49TEY4MF
Components: TIRES
Summary: The right rear tire (Goodyear Wrangler 275/65R20) separated and blew out on the highway, the truck was very difficult to control however it was safely stopped and there were no injuries. There was no observed warning prior to the blow out. The tire separation caused damage to the right rear quarter panel. The spare was installed and finished the trip safely. A tire shop found a second tire with evidence of separation on the left front corner. The tire that blew out on the highway is (DOT PJOT JB1V 0721) and the other 3 including the one with evidence of separation is (DOT PJOT JB1V 0821). The blown tire has been returned to Goodyear in Ohio by the auto repair facility at Goodyears request. Goodyear is refusing to assess the other 3 tires unless I bring them to an authorized service center which is not possible with only 3 functional tires including the spare. The 3 remaining tires are at the auto repair facility.

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2022-04-03

FUEL/PROPULSION SYSTEM PROBLEM

Date Of Incident: 2022-02-24
VIN: 1GT49WEY1MF
Components: FUEL/PROPULSION SYSTEM
Summary: Part Number: 85138746 - DEF tank assembly, heater, pump, reservoir. I was told there were issues with the heater and pump. The heater turns high or the heater won’t work; and there are issues with the connector.02/24/22: My truck has 16,000 approx. miles. The check engine light came on and displayed message that I had so many miles until truck would be restricted to 65MPH. I took my truck into Kendall dealership in Nampa, Idaho and was told there was myself and another person who had the same issue. A couple weeks go by and I call the dealership back and was told that I was 5th in line and there were 20 behind me. I was told that there were 11,000 parts already spoken for and 6,000 parts on backorder. I was one of the backorder individuals. I was also told that they do not have a ETA on when they would receive parts and that parts show up unexpected. They told me that I would have to contact GM customer service for assistance. The dealer called me back March 31st to see if I got my camper moved and how much it cost to move. They told me the dealership would cover one month truck payment and would like me to send in my loan payment statement. I asked for clarification as I didn’t know how I could have been 2nd person and the other day he said I was fifth in line. He said that there are at least 2-3 persons for service technician at dealership. Only 2 got fixed in the last 2 months. I asked if the new part going in will have the same issue or will be a re-designed part that fixes the issue. Dealer said the same part. GM is working on a re-design part and not ready for manufacturing. I asked why this wasn’t on a recall and he said no because it would bring people in that don’t need it replaced because their part is still working, and that GM doesn’t have a re-designed part to fix the issue. Gortsema Motors in Grangeville, Idaho a friend brought in their 2018 Chevydiesel truck (with 87,000 miles) for the same issue. Dealer said they have many cases.

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2022-04-03

POWER TRAIN PROBLEM

Date Of Incident: 2021-02-14
VIN: 1GT49WEY1MF
Components: POWER TRAIN
Summary: Problem: Unable to shift transmission from D to another position like R, P, N due to snow/slush being on shifter. I travel on Idaho state highways and County roads that are plowed. In February, I traveled state highway 14. Road conditions were plowed snow roads, broken snow floor, slush and pavement without slush or snow. I had a passenger with me on this trip from Elk City, Idaho to Grangeville, Idaho via SH-14. When I pulled into my storage unit, I could not shift from D to P or N or R. I could only drive forward. The temperature in Grangeville was mid 40s. I did not have any tremendous snow build up on the under carriage or wheel wells. I drove to the dealer Gortsema Motors and their service technician said that I needed to go to a car wash and blow out the snow buildup next to the transmission linkage shifter. When I pulled into the car wash, I still could not shift the transmission. My passenger got out and used the water to push out the snow buildup around the linkage shifter. Then I was able to shift between all gears P, R, N, D. This is a big concern because this should not have happened. This is a major problem in the winter and had there not been a car wash to blow out the snow/slush, I would not be able to turn the truck off or restart the diesel truck in gear. There needs to be a protective shield around the shifter so that snow/slush does not get up into area and cause the shifter to not shift.

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2022-03-05

POWER TRAIN,SERVICE BRAKES,ENGINE PROBLEM

Date Of Incident: 2021-12-10
VIN: 1GT49UEY9MF
Components: POWER TRAIN,SERVICE BRAKES,ENGINE
Summary: The throttle body gets stuck wide open after the eninge gets up to operating temperature, it will give some warning with the throttle like on off throttle use and no codes show up at all. The risk of everyones is in extrem DANGER. The break are to soft and well not stop unless you put both feet on the break pedal down to the floor. Tranismission can NOT figure out what gear it needs to be in way too many gears and horrible fuel mpg for the 6.6L Duramax L5P. None of the GM dealership will look at the truck unless there is a code or it is happening right there when they look up the trucks VIN.

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2022-02-28

POWER TRAIN,ENGINE,FUEL/PROPULSION SYSTEM PROBLEM

Date Of Incident: 2022-02-24
VIN: 1gt49wey6mf
Components: POWER TRAIN,ENGINE,FUEL/PROPULSION SYSTEM
Summary: •The diesel exhaust fluid heater is a faulty component in the system, there is a back order on the part with no ETA • My pickup only does 55MPH right now and soon to do 5MPH you cannot drive on a public road doing 5MPH •There is thousands of other people having the same exact problem! •The DEF light is illuminated on my dash along with the check engine light, when you diagnose the error code it comes up with “P20C1 Reductant Heater C Control Circuit/OPEN”

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2022-01-10

STRUCTURE PROBLEM

Date Of Incident: 2022-01-03
VIN: 1gt49vey5mf
Components: STRUCTURE
Summary: Tailgate falls open while traveling down the road

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2021-10-26

SERVICE BRAKES PROBLEM

Date Of Incident: 2021-10-26
VIN: 1GT49TEYXMF
Components: SERVICE BRAKES
Summary: The vehicle recently had a recall repaired at the dealership. I subsequently took delivery on it as a BRAND NEW UNIT, and the brakes are extremely soft; to the point where I must depress the pedal to the floor to get it stopped even at slow speeds. I hoped it was just an air bubble from the repair; but the fluid levels are full and the dealer had no ideas on what could be wrong at this point. I have a great relationship with this dealer, and we’ll continue working on it. But GM is releasing absolute trash lately and I fear that some poor family will load up, trusting these vehicles, and be badly injured or killed. After 200 miles of driving it back to my residence, both at highway speeds and residential road speeds, these brakes have not improved; ruling out an air bubble. I’m worried it may be associated with the recall that was previously remedied.

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2021-06-10

ELECTRICAL SYSTEM,SERVICE BRAKES PROBLEM

Date Of Incident: 2021-06-10
VIN: 1gt49vey4mf
Components: ELECTRICAL SYSTEM,SERVICE BRAKES
Summary: Trailer brake wiring connection continually disconnectsthen reconnects some time later. Some periods of up to 10 minutes without having trailer braking power. Major safety issue when toeing fifth wheel trailer. We lost brakes going down steep grades. GMC is aware of issue, but has not provided a solution. Vehicle has been yo service shop with no resolution. Case has been opened with GMC.

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2021 Gmc Sierra 3500 recalls

The National Highway Traffic Safety Administration (NHTSA) has issued 4 recalls for different components of the 2021 Gmc Sierra 3500.

2024-02-01

Manufacturer: General Motors, LLC
Components: LATCHES/LOCKS/LINKAGES:TAILGATE:LATCH
Summary: General Motors, LLC (GM) is recalling certain 2020-2024 Chevrolet Silverado 2500, 3500, GMC Sierra 2500 and 3500 vehicles equipped with power-unlatching tailgates. The tailgate's electronic gate-release switch may short circuit due to water intrusion, which can result in the tailgate inadvertently unlatching while the vehicle is in park.
Consequence: An unlatched tailgate may open while driving and result in a loss of unsecured cargo, creating a road hazard and increasing the risk of a crash.
Remedy: Owners are advised to check that the tailgate is closed and latched before driving. Dealers will replace the exterior touchpad switch assemblies, free of charge. Owner notification letters were mailed May 17, 2024. Owners may contact Chevrolet customer service at 1-800-222-1020 or GMC customer service at 1-800-462-8782. GM's number for this recall is N232426400.

2021-09-29

Manufacturer: General Motors, LLC
Park Out Side: 1
Park Out Side: 1
Components: SERVICE BRAKES, HYDRAULIC:POWER ASSIST:ELECTRIC:CONTROL MODULE
Summary: General Motors, LLC (GM) is recalling certain 2021-2022 Chevrolet Silverado 2500, Silverado 3500, GMC Sierra 2500, and Sierra 3500 vehicles with electronic brake control modules (EBCM) replaced during vehicle assembly. The bolts that attach the brake pressure modulator valve (BPMV) assembly may not be properly tightened, which could fail to seal the two sub-assemblies and allow water intrusion.
Consequence: Water in the BPMV may cause an electrical short circuit and increase the risk of fire.
Remedy: Owners are advised to park outside and away from other structures until the recall repair is completed. Dealers will replace the BPMV assembly, free of charge. Owner notification letters were mailed on October 20, 2021. Owners may contact Chevrolet customer service at 1-800-222-1020 or GMC customer service at 1-800-462-8782. GM's number for this recall is N212349181.

2020-12-23

Manufacturer: General Motors, LLC
Components: SEAT BELTS
Summary: General Motors, LLC (GM) is recalling certain 2020 Chevrolet Bolt EV and 2021 GMC Canyon and Sierra 1500, 2500 and 3500, Yukon, Yukon XL, Cadillac Escalade and Escalade ESV and Chevrolet Blazer, Camaro, Colorado, Equinox, Silverado 1500, 2500 and 3500, Suburban and Tahoe vehicles. Incorrect bolts may have been used at one or more fastening locations to secure the seat belts to the vehicle. If an incorrect bolt was used, the seat belt may not be properly attached to the vehicle.
Consequence: If a seat belt assembly is not properly attached to the vehicle, the seat belt may not properly restrain an occupant in the event of a crash, increasing the risk of injury.
Remedy: GM will notify owners, and dealers will replace the suspect bolts, free of charge. The recall began January 29, 2021. Owners may contact GMC customer service at 1-800-462-8785, Cadillac customer service at 1-800-458-8006, or Chevrolet customer service at 1-800-222-1020. GM's number for this recall is N202322230.

2020-12-17

Manufacturer: General Motors, LLC
Components: SEAT BELTS
Summary: General Motors, LLC (GM) is recalling certain 2019-2021 Chevrolet Silverado 1500 and GMC Sierra 1500, 2021 Chevrolet Suburban and Tahoe and GMC Yukon XL and 2020-2021 Chevrolet Silverado 2500 and 3500 and GMC Sierra 2500 and 3500 vehicles. The seat belt brackets may not be secured to the seat frame in the front-row center seating position.
Consequence: If a seat-belt bracket is not secured, the seat belt may not properly restrain an occupant in the front-row center seat position, increasing the risk of injury in a crash.
Remedy: GM will notify owners, and dealers will inspect left-side and right-side front-row center seat-belt bracket attachments and reassemble it correctly as necessary, free of charge. The recall began January 26, 2021. Owners may contact GMC customer service at 1-800-462-8782, Chevrolet customer service at 1-800-222-1020. GM's number for this recall is N202314670.

Additional sources

More sources of information about 2021 Gmc Sierra 3500 problems:

Issues and Recalls | Chevy and GMC Duramax Diesel Forum

https://www.duramaxforum.com/threads/issues-and-recalls.1008283/

Jul 21, 2020 ... Bought it in August of 2019, just ticked past 15000 miles. 2021 GMC Denali HD 3500 SRW - Michelin LTX AT2s

2021 GMC Sierra HD 2500 Air Conditioner Problems - Q&A

https://www.justanswer.com/car/m690u-son-2021-gmc-sierra-hd-2500-air-conditioner.html

Jun 8, 2023 ... There have been a couple of issues I've seen with compressors and cooling fans acting up, but nothing overly common. Are ya'll wanting to ...

2021 GMC Sierra 3.0 issues | Chevy and GMC Duramax Diesel Forum

https://www.duramaxforum.com/threads/2021-gmc-sierra-3-0-issues.1015284/

Jun 21, 2021 ... ... issues on the 3.0 Duramax. I bought the truck new Dec 2020. At about 3500 miles, I kept noticing a smoking plume from the engine right side.

2021 Duramax issues, less than a week old. - GM-Trucks.com

https://www.gm-trucks.com/forums/topic/246299-2021-duramax-issues-less-than-a-week-old/

Dec 26, 2020 ... ... common issue with the Chevy 2500/3500's and GMC 2500/3500's. ... Have a 2021 GMC Sierra 3500 Dmax as well ... issue with the Chevy 2500/3500's and ...