Sell your 2018 GMC Sierra for cash

The 2018 GMC Sierra is a pickup truck that came with a choice of 4.3L 6-cyl, 5.3L 8-cyl and 6.2L 8-cyl engines. Even at 8 years old, a damaged or broken-down one still has real value for its parts. Running or not, we'll make you an offer and tow it away for free.

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2018 GMC Sierra at a glance

Body styleStandard Pickup Trucks 2WD, Standard Pickup Trucks 4WD, Special Purpose Vehicle 2WD, Special Purpose Vehicle 4WD
Engines4.3L 6-cyl, 5.3L 8-cyl, 6.2L 8-cyl
TransmissionsAutomatic 8-spd, Automatic 6-spd
DriveRear-Wheel Drive, 4-Wheel Drive
FuelRegular Gasoline, Premium Gasoline
Fuel economy15–18 city / 19–24 highway / 17–20 combined MPG
EPA annual fuel cost$3,350–$4,850 a year (EPA estimate at current fuel prices, 15,000 miles)
Tailpipe CO₂447–524 grams per mile
EPA fuel economy score3–4 out of 10
EPA greenhouse gas score3–4 out of 10
Curb weight (NHTSA test vehicle)5,262–5,540 lb
Gross vehicle weight rating6,500–7,600 lb
Versions tested by EPA14 configurations: Sierra 15 Hybrid 2WD, Sierra C15 2WD, Sierra 15 Hybrid 4WD, Sierra K15 4WD, Sierra C15 Cab Chassis 2WD, Sierra K15 Cab Chassis 4WD
Age8 years

Specs, fuel cost and emissions from the EPA's fueleconomy.gov data; weights from NHTSA crash-test records. Your car's exact equipment may differ.

What affects its junk value

  • Age: at 8 years old, a 2018 Sierra is newer than most junk cars, so working parts like the engine, transmission and body panels are in demand from rebuilders and parts buyers.
  • Weight: NHTSA's crash-test 2018 Sierra weighed 5,262–5,540 lb at curb weight. Scrap value is largely priced by weight, so this is a good starting point. See how scrap prices by weight work.
  • Catalytic converter: like all gas and diesel cars, it has a catalytic converter containing precious metals, one of the most valuable parts on a junk car. An offer assumes it's still in place. More on catalytic converters.
  • Hybrid battery: hybrid versions also carry a high-voltage battery pack, which recyclers and rebuilders pay for.
  • Recalls: NHTSA lists 7 recalls for the 2018 Sierra. Open recalls don't stop you from selling or junking it.
  • Known problems: owners reported the most issues with the power train, typically around 30,000 miles. If that's what failed on yours, it can still be sold as-is.

How junk car offers are calculated

2018 GMC Sierra recalls

NHTSA lists 7 safety recalls covering the 2018 GMC Sierra. Open recalls don't stop you from selling or junking the car, but check your VIN at nhtsa.gov/recalls to see which apply to yours.

Air BagsMay 2026 · NHTSA campaign 26V325000

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.

Air BagsMar 2026 · NHTSA campaign 26V166000

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.

Air BagsJun 2025 · NHTSA campaign 25V432000

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.

Air BagsOct 2024 · NHTSA campaign 24V756000

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.

Service Brakes, HydraulicOct 2020 · NHTSA campaign 20V603000

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.

Service BrakesOct 2019 · NHTSA campaign 19V761000

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…

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.

Service Brakes, HydraulicSep 2019 · NHTSA campaign 19V645000

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.

Common 2018 Sierra problems

Owners have filed 305 complaints about the 2018 GMC Sierra with NHTSA. 10 reports involved a crash and 1 report involved a fire. Owners reported 5 injuries.

Complaints are reports from owners and aren't verified by NHTSA. One complaint can list several components. Mileage is the median odometer reading owners reported for that component.

Most-reported components

  • Power Train129
  • Engine67
  • Electrical System41
  • Service Brakes40
  • Steering30
  • Unknown or Other25

Typical mileage when problems were reported

  • Power Train30,000 mi
  • Engine47,000 mi
  • Electrical System36,000 mi
  • Service Brakes13,000 mi
  • Steering16,000 mi
  • Unknown or Other17,000 mi

2018 GMC Sierra crash test ratings

NHTSA's 5-Star Safety Ratings for the 2018 GMC Sierra, by version tested.

VersionOverallFrontal crashSide crashRolloverRollover risk
Pu/Ec, 4WD★★★★★★★★★★★★★★★★★★★☆17.9%
Pu/Rc, 4WD★★★★★★★★★★★★★★★★★★★☆17.4%
Pu/Cc, 4WD★★★★★★★★★★★★★★★★★★★☆17.4%
Pu/Rc, RWD★★★★★★★★★★★★★★★★★★★☆17.9%
Pu/Cc, RWD★★★★★★★★★★★★★★★★★★★☆17.9%
Hybrid Pu/Cc, RWD★★★★★★★★★★★★★★★★★★★☆17.9%
Pu/Ec, RWD★★★★★★★★★★★★★★★★★★★☆17.4%

Source: NHTSA 5-Star Safety Ratings (NCAP). Ratings from different model years or rating systems aren't directly comparable.

2018 GMC Sierra service bulletins

Manufacturers have filed 956 technical service bulletins and communications with NHTSA covering the 2018 GMC Sierra. These are repair instructions for known issues, not recalls.

1 of them is a warranty extension. Warranty extensions mean the manufacturer agreed to cover a specific repair beyond the normal warranty. They rarely still apply to a car this age, but they point to known weak spots.

Most common bulletin topics

  • Engine and Engine Cooling120
  • Electrical System118
  • Power Train89
  • Unknown or Other88
  • Equipment84
  • Engine67

Recent bulletins

  • Service Bulletin/Repair InstructionsSep 2026 · PIT5698F

    This PI provides Diagnostics tips on how the LIN bus works and how to diagnosis it.

  • Service Bulletin/Repair InstructionsSep 2026 · PIP5700H

    This PI communicates the proper part numbers for transmission connectors and internal harness to prevent confusion when ordering

  • Service Bulletin/Repair InstructionsSep 2026 · PIP4902W

    This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance.

  • Service Bulletin/Repair InstructionsJul 2026 · PIT5680B

    This PI provides information to repair the door water deflector which is not sealed properly allows water into the door jam/sill area.

Source: NHTSA manufacturer communications (technical service bulletins).

Other GMC Sierra years

‹ Sell a 2017 Sierra · Sell a 2019 Sierra › · All GMC Sierra years

Other 2018 GMC models

Selling a 2018 Sierra: questions

How much is a 2018 GMC Sierra worth for junk?

It depends on its condition, whether major parts like the engine, transmission and catalytic converter are still there, and current scrap and parts prices where you live. As a heavier vehicle, its scrap weight adds to the offer. Enter your ZIP code above for a free offer on your specific car.

Can I junk a 2018 Sierra that doesn't run?

Yes. We buy 2018 Sierras that don't start, were in an accident, failed inspection or have a blown engine or transmission. Towing is always free.

Can I sell a 2018 Sierra with open recalls?

Yes. Open recalls don't prevent a junk sale. NHTSA lists 7 recalls for the 2018 GMC Sierra; you can check whether any are still open on yours with the VIN lookup at nhtsa.gov/recalls.

What paperwork do I need to sell my 2018 Sierra?

Usually the title and a photo ID. Rules differ by state, including what to do with your plates and whether to file a notice of sale. Check our state-by-state car title guides for the official forms.

Before you sell

Sources

Data retrieved October 2026.

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