Owner complaints, recalls, fuel economy and safety ratings from public NHTSA and EPA data, updated Oct 17, 2026.
The 2018 GMC Sierra has 322 owner complaints filed with NHTSA, most of them about transmission and drivetrain (133). Its combined fuel economy is 17 to 20 mpg, with a 5-year fuel cost of $16,240 to $23,670 at U.S. average prices, based on 15,000 miles per year. NHTSA rates it 5 stars overall. Recall campaigns may apply to this model: 7 in total, covering air bags, brakes, and stability control.
Written by AI from public EPA and NHTSA data. Not a review.
Fuel economy
17–20 mpgcombined; city 15–18, highway 19–24; every version of this model year
Five years of fuel
$16,240–$23,670U.S. average; Ohio $14,510–$22,310 at local prices; every version of this model year; fuel only, not other costs of owning it; 15,000 miles a year, at EIA fuel prices for the week of Oct 12, 2026
NHTSA's VIN data lists these trims for the 2018 Sierra. A trim's engine and numbers are shown as its own only where EPA names versions after the trim and no other version could be it; "seen with" means a source shows that engine on the trim, not that it was the only one. Recalls and complaints cover the whole model year: whether a recall applies to a car depends on its VIN, on NHTSA's recall lookup.
Owners have filed 322 complaints with NHTSA about the 2018 Sierra. These are unverified owner reports, counted by the part of the car they name; one complaint can name several parts. Counts aren't adjusted for how many were sold, so they don't show how reliable a car is.
Complaints by part of the car
Part
Complaints
Crashes
Fires
Injuries
Power train
133
4
0
3
Engine
72
0
0
0
Service brakes
44
2
0
1
Electrical system
43
0
1
0
Steering
33
1
0
1
Unknown or other
26
2
1
1
Suspension
12
1
0
0
Fuel/propulsion system
10
1
1
0
Structure
10
1
0
0
Air bags
8
4
0
3
Wheels
8
0
0
0
Engine and engine cooling
6
0
0
0
13 more parts
Exterior lighting
6
0
0
0
Forward collision avoidance
6
0
0
0
Vehicle speed control
6
0
0
0
Seat belts
5
0
0
0
Tires
5
0
0
0
Service brakes, hydraulic
4
0
0
0
Visibility
4
0
0
0
Electronic stability control (ESC)
3
0
0
1
Equipment
3
0
0
0
Seats
2
0
0
0
Visibility/wiper
2
0
0
0
Fuel system, gasoline
1
0
0
0
Lane departure
1
0
0
0
Complaints by model year
Newer years have had less time to collect complaints, and counts aren't adjusted for sales, so a shorter bar doesn't mean a more reliable year.
NHTSA lists 7 recall campaigns for the 2018 Sierra over its history. Campaigns are matched by model and year, so each one may apply to a given car, and its repair may already be done: check a VIN on NHTSA's recall lookup for the open recalls on that exact car.
General Motors, LLC (GM) is recalling certain 2018 Chevrolet Silverado 1500, GMC Sierra 1500, 2019 Chevrolet Silverado 2500, Silverado 3500, GMC Sierra 2500, and Sierra 3500 vehicles. The left-side or right-side roof rail air bag (RRAB) inflator end cap may detach from the inflator or the inflator sidewall may rupture.
Risk: A detached end cap or inflator rupture can allow compressed gas to escape and project the end cap or fragments of the inflator into the vehicle, increasing the risk of injury.
Remedy: Dealers will replace both RRAB modules, free of charge. Owner notification letters were mailed June 24, 2026. Owners may contact GMC customer service at 1-888-988-7267 or Chevrolet customer service at 1-800-222-1020. GM's number for this recall is N262557310. Vehicle Identification Numbers (VINs) involved in this recall became searchable on NHTSA.gov on May 21, 2026. This recall expands previous NHTSA recall number 26V166.
General Motors, LLC (GM) is recalling certain 2018 Chevrolet Silverado 1500, GMC Sierra 1500, 2019 Chevrolet Silverado 2500, Silverado 3500, GMC Sierra 2500, and Sierra 3500 Crew Cab vehicles. The left or right-side roof rail air bag (RRAB) inflator end cap may detach from the inflator or the inflator sidewall may rupture.
Risk: A detached end cap or inflator rupture can allow compressed gas to escape and project the end cap or fragments of the inflator into the vehicle, increasing the risk of injury.
Remedy: Dealers will replace the left and right-side RRAB modules, free of charge. Owner notification letters were mailed April 16, 2026. Owners may contact GMC customer service at 1-888-988-7267 or Chevrolet customer service at 1-800-222-1020. GM's number for this recall is N262549710. Vehicle Identification Numbers (VINs) involved in this recall became searchable on NHTSA.gov on March 19, 2026.
General Motors (GM) is recalling certain 2018 GMC Sierra 1500, 2019 Sierra 2500, 3500, Chevrolet Silverado 3500, and Chevrolet Silverado 2500 and 2018 Chevrolet Silverado 1500 Crew Cab vehicles. The left or right-side roof-rail air bag (RRAB) inflator end cap may detach from the inflator or the inflator sidewall may rupture.
Risk: A detached end cap or inflator rupture can allow compressed gas to escape and project the end cap or fragments of the inflator into the vehicle, increases the risk of injury or crash.
Remedy: Dealers will replace the left and right side RRAB modules, free of charge. Owner notification letters were mailed July 23, 2025. Owners may contact GMC customer service at 1-888-988-7267 or Chevrolet customer service at 1-800-222-1020. GM's number for this recall is N252513060.
General Motors, LLC (GM) is recalling certain 2018 Chevrolet Silverado 1500, GMC Sierra 1500, 2018-2019 Chevrolet Silverado 2500, 3500, and GMC Sierra 2500, 3500 Crew Cab trucks. The left or right-side roof-rail air bag (RRAB) inflator end cap may detach from the inflator or the inflator sidewall may rupture.
Risk: A separated inflator end cap or inflator rupture can allow compressed gas to escape, resulting in the end cap or other components being propelled into the vehicle, increasing the risk of injury or crash.
Remedy: Dealers will replace the left and right side RRAB modules, free of charge. Owner notification letters were mailed November 8, 2024. Owners may contact Chevrolet customer service at 1-800-222-1020, and GMC Customer Service at 888-988-7267. GM's number for this recall is N242474500.
General Motors LLC (GM) is recalling certain 2018 Cadillac Escalade, Chevrolet Silverado 1500 and Tahoe, GMC Sierra 1500 and Yukon vehicles equipped with either a 5.3L or 6.2L V8 engine. The output of the mechanical vacuum pump can decrease over time, decreasing the amount of vacuum/power brake assist.
Risk: A decrease in brake assist can increase the brake pedal effort and distance required to stop the vehicle, increasing the risk of a crash.
Remedy: GM will notify owners, and dealers will reprogram the Electronic Brake Control Module, free of charge. The recall began November 11, 2020. Owners may contact GM customer service at 1-866-522-9559, Cadillac customer service at 1-800-458-8006 or Chevrolet customer service at 1-800-630-2438. GM's number for this recall is N202300860.
General Motors LLC (GM) is recalling certain 2015-2020 Chevrolet Suburban, Tahoe, and GMC Yukon, and 2014-2018 Chevrolet Silverado 1500 and GMC Sierra 1500 vehicles equipped with a 5.3-liter engine, a 3.08-ratio rear axle and four-wheel drive. If a wheel-speed sensor fails, while the vehicle is traveling between 41 and 60 mph in four-wheel or automatic mode, the Electronic-Brake Control Module (EBCM) software may activate the driveline-protection system.
Risk: Unintended activation of the driveline-protection system will cause unintended braking on the wheel on the opposite side of the failed sensor, causing the vehicle to pull to one side unexpectedly, increasing the risk of a crash.
Remedy: GM will notify owners, and dealers will reprogram the EBCM, free of charge. The recall began December 11, 2019. Owners may contact Chevrolet customer service at 1-800-630-2438 or GMC customer service at 1-800-462-8782. GM's number for this recall is N192261050.
General Motors LLC (GM) is recalling certain 2015-2017 Cadillac Escalade, 2014-2018 Chevrolet Silverado, GMC Sierra, 2015-2018 Chevrolet Suburban, Tahoe, GMC Yukon vehicles. The amount of vacuum created by the vacuum pump may decrease over time.
Risk: As the vacuum level drops, the brake assist decreases, increasing braking effort, extending the distance required to stop the vehicle, thereby increasing the risk of a crash.
Remedy: GM will notify owners, and dealers will reprogram the Electronic Brake Control Module, free of charge. The recall began October 8, 2019. Owners may contact Chevrolet customer service at 1-800-630-2438, Cadillac customer service at 1-800-458-8006 or GMC customer service at 1-800-462-8782. GM's number for this recall is N192268490.
Carmakers sent NHTSA 1,489 service bulletins and notices that cover the 2018 Sierra, the latest on Sep 26, 2026. They tell dealers how to fix known issues.
The parts they mention most: equipment (436), electrical system (289), engine and engine cooling (260), power train (182), engine (143).
NHTSA hasn't opened a defect investigation that covers this model year.
Maintenance
Oil
The owner's manual gives the oil and how often to change it. We show oil facts only once we've checked them against the manual, and we haven't yet for the 2018 Sierra.
These are searches on those sites; we don't copy or check their listings. Your ZIP is used for these links and never kept.
Specs
EPA class: standard pickup trucks. EPA greenhouse gas score: 3–4 out of 10. Each version EPA tested:
Swipe the table sideways for more columns.
Version
Engine
Transmission
Fuel
City / hwy / comb
Sierra 15 Hybrid Rear-Wheel Drive
5.3 L, 8 cyl
Automatic 8-spd
Regular Gasoline
18 / 24 / 20
Sierra 15 Hybrid 4-Wheel Drive
5.3 L, 8 cyl
Automatic 8-spd
Regular Gasoline
16 / 21 / 18
Sierra C15 Rear-Wheel Drive
4.3 L, 6 cyl
Automatic 6-spd
Regular Gasoline or E85
18 / 24 / 20
Sierra C15 Rear-Wheel Drive
5.3 L, 8 cyl
Automatic 6-spd
Regular Gasoline
16 / 23 / 19
Sierra C15 Rear-Wheel Drive
5.3 L, 8 cyl
Automatic 6-spd
Regular Gasoline or E85
16 / 23 / 19
Sierra C15 Rear-Wheel Drive
5.3 L, 8 cyl
Automatic 8-spd
Regular Gasoline
16 / 22 / 18
Sierra C15 Rear-Wheel Drive
6.2 L, 8 cyl
Automatic 8-spd
Premium Gasoline
15 / 21 / 17
Sierra C15 Rear-Wheel Drive
5.3 L, 8 cyl
Automatic 6-spd
Regular Gasoline
15 / 20 / 17
Sierra K15 4-Wheel Drive
4.3 L, 6 cyl
Automatic 6-spd
Regular Gasoline or E85
17 / 22 / 19
Sierra K15 4-Wheel Drive
5.3 L, 8 cyl
Automatic 6-spd
Regular Gasoline
16 / 22 / 18
Sierra K15 4-Wheel Drive
5.3 L, 8 cyl
Automatic 6-spd
Regular Gasoline or E85
16 / 22 / 18
Sierra K15 4-Wheel Drive
6.2 L, 8 cyl
Automatic 8-spd
Premium Gasoline
15 / 20 / 17
Sierra K15 4-Wheel Drive
5.3 L, 8 cyl
Automatic 8-spd
Regular Gasoline
15 / 20 / 17
Sierra K15 4-Wheel Drive
5.3 L, 8 cyl
Automatic 6-spd
Regular Gasoline
15 / 19 / 17
Sources and dates
U.S. EPA fuel economy data, file of Sep 29, 2026
NHTSA owner complaints, file of Oct 17, 2026
NHTSA recalls, file of Oct 17, 2026
NHTSA manufacturer communications, file of Oct 17, 2026
NHTSA defect investigations, file of Oct 17, 2026
NHTSA 5-Star Safety Ratings, file of Aug 7, 2026
U.S. Energy Information Administration, file of Oct 12, 2026
Fuel cost: EPA mpg with fuel prices for the week of Oct 12, 2026 and electricity prices for Jul 2026. Source: U.S. Energy Information Administration (Oct 2026). Complaints are unverified reports owners filed with NHTSA. About the data