2020 GMC Sierra 1500 Fuel system Problems
- Complaints
- 27about this part
- Share
- 6%of 484 total for the year
- Median mileage
- —not reported
- Trend
- RisingComplaints filed in the last 3 full calendar years are at least 25% higher than in the 3 years before.
NHTSA recorded 27 complaints about the fuel system of the 2020 GMC Sierra 1500, 6% of the 484 complaints for this model year. 1 of these say a crash was involved, according to the filers. 1 recall campaign on record is filed under a similar system.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“Transmission has slipped and shuddered multiple times. We have had it diagnosed at gmc dealership and our mechanic, advising that it is 8L90 transmission failure. It will slip to lower gear abruptly, causing for possible safety issues especially on the highways.”
NHTSA complaint #11665580, filed 2025-06“My vehicle suddenly did not want to start without any warning. I drove my truck and everything was good until I turned it on with the remote and not even a minute after it shut off. I tried turning it back on and it only cranked but would not start. I had a mechanic diagnose it and their computer gave them fuel pump error code. They said it was the fuel pump control module and that they have been getting several GM trucks of the same year having that issue. …”
NHTSA complaint #11535291, filed 2023-07“Number 5 cylinder failure. Engined has failed cylinder is scored causing the engine to miss and lock up. The engine which is a 6.2 l87 is now under investigation for a piston failure causing the engine to lockup. The piston and engine issue has been investigated by my local repair shop and I can provide written and bore scope pictures of the failure. Yes the engine light was on the ESC was disabled and needed replaced and the traction control was disabled also the emergency brake was enabled and then failed”
NHTSA complaint #11654330, filed 2025-04“My wiring harness which affects all systems. I was on the Interstate when out of nowhere any and all warning lights came on. The power was cut and rapidly slowed down. I also pulled into traffic and the truck just lost power. The problem was confirmed by dealership. The vehicle was inspected by dealership and wiring harness was the issue. The issues appeared out of nowhere. All the warnings lights came on at once. There has been numerous issues with this part and it’s even recognized by just.”
NHTSA complaint #11587778, filed 2024-05“On January 8th I was driving when my 2020 GMC Sierra 1500 Denali started to misfire as well as several warning lights blinking. I happen to be a couple miles from the dealership I purchased it at so I drove it straight there. A few days later I was notified it was the lifters that went bad and it would cost $5400 plus tax. This is disturbing since I have only had my truck for a little over 4 years with 68,000 miles on it. After researching the problem it appears that its a common issue and I notices a class action lawsuit for this reason. …”
NHTSA complaint #11637990, filed 2025-01Related recalls
- 19V837000Nov 21, 2019General Motors LLC (GM) is recalling certain 2020 Cadillac Escalade, Escalade ESV, Chevrolet Camaro, Silverado 1500, Suburban, Tahoe, GMC Sierra 1500, Yukon…Covers: GMC Sierra 1500 2020, Chevrolet Silverado 1500 2020, Camaro 2020 +6 more
Related 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.
- 11014161Jan 28, 2025This engineering information (EI) is requesting information from technicians to perform the check list provided and contact the engineer listed in regard to the vehicle having…
Fuel system: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2026 | 11 | 7% |
| 2025 | 7 | 6% |
| 2024 | 22 | 6% |
| 2023 | 38 | 8% |
| 2022 | 32 | 5% |
| 2021 | 42 | 7% |
| 2020 | 27 | 6% |
| 2019 | 27 | 4% |
| 2018 | 11 | 4% |
| 2017 | 7 | 2% |
| 2016 | 9 | 3% |
| 2015 | 13 | 2% |
| 2014 | 15 | 2% |
| 2012 | 3 | 3% |
| 2011 | 12 | 4% |
| 2010 | 6 | 4% |
| 2009 | 11 | 5% |
| 2008 | 5 | 1% |
| 2007 | 5 | 2% |
| 2006 | 8 | 6% |
| 2005 | 5 | 3% |
| 2004 | 9 | 4% |
| 2003 | 7 | 4% |
| 2002 | 1 | 1% |
| 2001 | 17 | 12% |
| 2000 | 14 | 8% |
| 1999 | 7 | 4% |
| 1998 | 4 | 7% |
| 1997 | 9 | 11% |
| 1996 | 1 | 20% |
| 1994 | 1 | 8% |
Other parts of the 2020 GMC Sierra 1500
245 complaintsTransmission and drivetrain
99 complaintsElectrical system
81 complaintsBrakes
55 complaintsOther or unknown
46 complaintsSteering
38 complaintsEngine cooling
21 complaintsSuspension
18 complaintsVisibility (wipers, defrost, mirrors)
15 complaintsForward collision avoidance
14 complaintsBody and structure
13 complaintsVehicle speed control
12 complaints
← All problems reported for the 2020 GMC Sierra 1500
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