2020 GMC Sierra 3500 Fuel system Problems
- Complaints
- 6about this part
- Share
- 12%of 51 total for the year
- Median mileage
- 19,000miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 6 complaints about the fuel system of the 2020 GMC Sierra 3500, 12% of the 51 complaints for this model year. Where a mileage was given, the median is 19,000 miles.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“The computer malfunctions. It is available for inspection. The computer lights up and causes failure in the trailer brakes. Glenn Polk the dealership in Sanger Texas has been working on a fix but has yet to come up with one. I have spoken with General Motors Representatives several time trying to resolve the problem without result. I also emailed the CEO last Friday and have heard nothing. There were no warning lights until seconds before failure.”
NHTSA complaint #11418543, filed 2021-05“I was towing my 44'camper entering the highway and during excellration there was a loud bang and the truck shuddered no lights on the dash. Pulled over and did a visual check of the vehicle and did not see anything out of ordinary. Continued on our journey and during the the week noticed clunking noise when shifting into park and into drive with no camper. We shortened our trip and returned home with no futher incidents. Received recall letter from GM in December, called the dealer and was told Gm has not released my VIN number yet. …”
NHTSA complaint #11645490, filed 2025-02“My IntelliBeam function stops working sometimes, I can still use the lights as normal but the IntelliBeam function stops every so often and starts working after about 2 to 10 mins. Lane departure warning stops every so often and will start working after 1 to 10 mins, I have noticed that when it stops working at night time then the IntelliBeam function stops working also. When I press the on/off button for lane departure then it will say that lane departure is unavailable right now. I have been getting a p20ee code showing something is wrong with SCR nox sensor 2. …”
NHTSA complaint #11661486, filed 2025-05“The contact owns a 2020 GMC Sierra 3500. The contact stated while driving approximately 60 MPH, the vehicle jerked, lost motive power, and almost stopped unintendedly. There was no warning light illuminated. The contact was able to pull into a parking lot, where the vehicle shut off. The contact stated that while attempting to restart the vehicle, the diagnostic trouble code: P129F was displayed, and the vehicle failed to restart. The vehicle was towed to the residence. …”
NHTSA complaint #11627460, filed 2024-11, 19,000 milesRelated service bulletins
- 11017173Mar 21, 2025This informational bulletin instructs the tech when fuel/fluid is needed to be tested and where it can be sent for analysis.
- 11011443Oct 15, 2024This Preliminary information communicates information on faulty replacement K111 Fuel Pump Driver Control Module.
- 11010874Oct 15, 2024This bulletin provides information on how to look for and test for DEF or water in the fuel system and what the specs should be.
- 11009462Sep 23, 2024This informational bulletin provides information on availability for a locking gas cap for trucks are operated in high amount of dirt or dust which can migrate to the filler cap…
- 11009430Sep 19, 2024This technical bulletin provides a procedure to correct the condition of Malfunction Indicator Lamp Illuminated with DTCs P2463 P2459 P11FB P11D3.
Fuel system: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2026 | 1 | 20% |
| 2024 | 5 | 10% |
| 2023 | 2 | 7% |
| 2022 | 1 | 3% |
| 2021 | 2 | 10% |
| 2020 | 6 | 12% |
| 2019 | 1 | 8% |
| 2018 | 1 | 7% |
| 2016 | 3 | 16% |
| 2015 | 2 | 6% |
| 2014 | 2 | 29% |
| 2013 | 2 | 14% |
| 2012 | 3 | 33% |
| 2011 | 2 | 10% |
| 2008 | 3 | 12% |
| 2005 | 1 | 4% |
| 2004 | 4 | 17% |
| 2003 | 1 | 14% |
| 2002 | 6 | 30% |
| 2001 | 8 | 22% |
| 1999 | 1 | 5% |
| 1998 | 2 | 17% |
Other parts of the 2020 GMC Sierra 3500
19 complaintsElectrical system
9 complaintsBrakes
7 complaintsEngine
6 complaintsOther or unknown
6 complaintsBody and structure
5 complaintsTires
4 complaintsVisibility (wipers, defrost, mirrors)
2 complaintsAir bags
1 complaintsEngine cooling
1 complaintsExterior lighting
1 complaintsForward collision avoidance
1 complaints
← All problems reported for the 2020 GMC Sierra 3500
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 31, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology