Example carCar diagnostics for a 2018 GMC Sierra
Car diagnostics for the 2018 GMC Sierra: request it and CarmaCars arranges it with a trusted shop or connect you with one, and we can deliver a rental car to you while yours is in.
- Combined
- 11.8 to 13.9 L/100 km
- Body
- Standard Pickup Trucks
A rental while yours is in the shop
A trusted shop does the work and you keep driving while it has your car. We deliver a rental to you, by the day, at our usual rates.
The 2018 GMC Sierra for car diagnostics
- Body: standard pickup trucks (EPA size class).
2018 GMC Sierra: every figure
| Figure | Powertrain 1 | Powertrain 2 | Powertrain 3 | Powertrain 4 | Powertrain 5 | Powertrain 6 | Powertrain 7 | Powertrain 8 | Powertrain 9 | Powertrain 10 |
|---|---|---|---|---|---|---|---|---|---|---|
| Displacement | 5.3 L | 4.3 L | 4.3 L | 5.3 L | 5.3 L | 5.3 L | 5.3 L | 5.3 L | 6.2 L | 6.2 L |
| Cylinders | 8 | 6 | 6 | 8 | 8 | 8 | 8 | 8 | 8 | 8 |
| MPG city (US) | 18 | 18 | 17 | 16 | 16 | 16 | 16 | 15 | 15 | 15 |
| MPG highway (US) | 24 | 24 | 22 | 21 | 22 | 22 | 21 | 20 | 21 | 20 |
| MPG combined (US) | 20 | 20 | 19 | 18 | 18 | 18 | 18 | 17 | 17 | 17 |
| MPG combined (Imperial) (converted from the US figure) | 24 | 24 | 23 | 22 | 22 | 22 | 22 | 20 | 20 | 20 |
| Fuel cost a year (EPA) (EPA: 15,000 miles at its fuel prices) | US$3,350 | US$3,350 | US$3,550 | US$3,700 | US$3,683 | US$3,700 | US$3,783 | US$3,950 | US$4,850 | US$4,850 |
| Fuel cost for 20,000 km (at $1.55 a litre) | $3,658 | $3,690 | $3,876 | $4,030 | $4,030 | $4,062 | $4,092 | $4,248 | $4,796 | $4,866 |
Sources: fuel use, MPG, CO2, electric range, battery, charge time, luggage volume and the annual fuel cost are the US EPA's (fueleconomy.gov). Imperial MPG, litres, inches and pounds are converted from those figures. Figures no free source publishes for this car (power, torque, acceleration, top speed, fuel tank, towing) are left out.
What to check when buying the 2018 GMC Sierra
- NHTSA lists 12 recall campaigns for this model year. Ask the seller for proof each one was fixed; a dealer can check it by the VIN.
- Owners filed 371 complaints with NHTSA, most often about power train (138), engine (81) and service brakes (54). Have those parts checked before you buy.
| Campaign | Date | Component | Summary |
|---|---|---|---|
| 26V325000 | 2026-05-21 | air bags | 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. |
| 26V166000 | 2026-03-19 | air bags | 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... |
| 25V432000 | 2025-06-26 | air bags | 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... |
| 24V756000 | 2024-10-10 | air bags:side/window:curtain:inflator | 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. |
| 23V047000 | 2023-02-02 | fuel system, diesel:storage:tank assembly | General Motors, LLC (GM) is recalling certain 2017-2019 Chevrolet Silverado 2500, 3500, and GMC Sierra 2500, 3500 vehicles equipped with a dual fuel tank option. The rear fuel tank may collapse and prevent the fuel pump from transferring fuel to the front tank, resulting in an engine stall. |
| 21V496000 | 2021-07-01 | equipment:electrical:engine block heater | General Motors, LLC (GM) is recalling certain 2017-2019 Chevrolet Silverado 2500, 3500 and 2017-2019 GMC Sierra 2500 and 3500 vehicles equipped with a Duramax diesel 6.6 liter engine and an optional engine-block heater cord. An electrical short-circuit may occur in the engine-block heater cable or in the terminals... |
| 20V603000 | 2020-10-01 | service brakes, hydraulic:power assist:vacuum | 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. |
| 19V761000 | 2019-10-24 | service brakes | 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... |
| 19V645000 | 2019-09-06 | service brakes, hydraulic:power assist:vacuum | 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. |
| 19V328000 | 2019-04-25 | engine | General Motors LLC (GM) is recalling certain 2019 Chevrolet Silverado 4500, 5500 and 6500 vehicles and 2017-2019 Chevrolet Silverado 2500 and 3500 vehicles and GMC Sierra 2500 and 3500 vehicles equipped with Duramax 6.6 liter diesel engines and an optional engine-block heater. The engine block heater cord or the... |
| 19V088000 | 2019-02-07 | fuel system, gasoline:storage:tank assembly | General Motors, LLC (GM) is recalling certain 2016-2018 GMC Sierra 3500 and Chevrolet Silverado 3500 trucks equipped with gasoline engines and dual fuel tanks. The fuel-level sensor in the front tank may stick in a low-level position, allowing the rear tank to overfill the front tank. |
| 17V567000 | 2017-09-14 | seat belts:front:retractor | General Motors (GM) is recalling certain 2017-2018 Chevrolet Silverado 2500 and 3500 and GMC Sierra 2500 and 3500 trucks. The front seat belt retractor assemblies were built with the incorrect torsion bar. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number... |
Source: NHTSA (US) recall campaigns and owner complaints for this model year.
Car diagnostics: how we help
For a diagnostic check on the 2018 GMC Sierra, CarmaCars arranges a trusted shop and rents you a car while yours is in. A warning light is the car asking for a diagnostic scan; the code tells the shop where to look.
Your Sierra and the shop
A photo of the dashboard warning light helps the shop prepare. The shop sets its own price and time after it sees the car. Tell the shop about any warning light or sound you have noticed. Its 5.3L 8-cylinder hybrid drives through an 8-speed automatic.
The steps
Send the car's details and what it needs; we take it from there. Send a request with the car and what it needs; a person replies within one business day and arranges it with a trusted shop or recommends one. Your request goes to a person, who arranges a trusted shop or gives you its name.
A car meanwhile
If the repair runs long, keep the rental longer. Add a rental to the same request as the repair. The car can come to your door in the Toronto area, or you pick it up at no charge.
Good habits for your car
Wash the underside of the car in winter to clear road salt. Look at the tire tread before long trips. Check that all lights work every few weeks.
Getting a clear quote
If you want to see the old parts, ask for them back. Ask for the work to be listed line by line on the invoice. Ask how the shop will contact you if it finds something unexpected.
Let us know
Tell us what is wrong with the car, and we arrange the rest with a trusted shop.
Request car diagnostics
Tell us when suits you. A person replies within one business day and arranges it with a trusted shop or recommends one; the shop sets its own price and time.
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