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GMC Sierra
2021 · gas, truck
5 measured figures
5 of the 9 figures this market publishes for a car like this one are measured for this car. This market publishes no overall score, so there is no share of a composite weight to measure confidence against; figures_measured says how many of this market's figures the row carries, and contributing_publishers says who measured them

Measured figures

Fuel economy21 mpg (US gallons)Measured by EPA · configuration: Sierra 2WD
Tailpipe CO₂262 g/kmMeasured by EPA · CO₂ basis: tailpipe_rated · configuration: Sierra 2WD · also 421 g/mile
WarrantyFree with an accountMeasured for this car, with its publisher and basis
Recall campaignsFree with an accountMeasured for this car, with its publisher and basis
Complaints per 10,000 builtFree with an accountMeasured for this car, with its publisher and basis

3 more measured figures for this car — Warranty, Recall campaigns, Complaints per 10,000 built — each with the publisher that measured it and the basis it is on. Free to read with an account.

Figures this car does not carry

Fuel economy (MPGe)Not published for this carFuel economy (MPGe) is published for electric and hydrogen cars, whose economy is published as MPGe: energy converted at 33.7 kWh per gallon, not fuel burned; this car is not one of them, so the figure is not the same quantity for it
Tailpipe CO₂ (charge-weighted)Not published for this carthis car's CO₂ is published as the tailpipe rating for the car driven as rated on the test cycle (262 g/km), not as a composite weighted across electric and fuel-burning miles, so it is not the quantity this list orders. It is published as Tailpipe CO₂
HorsepowerNot published for this carNot published for this car. The record's own reason is free to read with an account.
Engine horsepowerNot published for this carNot published for this car. The record's own reason is free to read with an account.
Kerb weightNot published for this carNot published for this car. The record's own reason is free to read with an account.
EPA test weightNot published for this carNot published for this car. The record's own reason is free to read with an account.
NHTSA overall ratingNot published for this carNot published for this car. The record's own reason is free to read with an account.
PriceNot published for this carNot published for this car. The record's own reason is free to read with an account.

5-Year Running Costs

Fuel$14,191
Insurance$8,400 (modelled)
Maintenance$5,200 (class estimate)
Repairs$8,000 (modelled)
Depreciationnot estimated — we hold no purchase price for this car, and it is not assumed.
Totalnot estimated — a component above is unknown or modelled

Running costs only — the purchase price is not included. The five-year running cost is an ESTIMATE, not a measurement of this car: only its fuel half is computed from the car's own measured consumption and a dated pump price (see fuel_price_source and fuel_price_as_of in the market's own figures); insurance, maintenance and repairs are class models. It orders no list and is not one of this market's published figures. Fuel is this car's own combined consumption over 13,800 miles a year at $4.319 a US gallon of petrol (U.S. Energy Information Administration, Gasoline and Diesel Fuel Update: U.S. regular gasoline retail price, all formulations, weekly, 2026-09-14). Insurance, maintenance and repairs are models, not figures for this car: insurance from its power, weight and crash rating, maintenance from its make's class, repairs from its complaint and recall counts. They are shown for scale and are not used to rank it. Confidence is low: several components are modelled from class averages.

Known Issues

ENGINE
235 complaint(s) · 2 report a crash, fire, injury or death
THE VEHICLE WAS BOUGHT BRAND NEW AND WAS ONLY DRIVEN FOR A WEEK. IT WAS IN MOTION ON THE FREEWAY WHEN THE ENGINE STARTED TO SOUND NOISIER THAN USUAL, LIKE THAT OF AN OLDER TRUCK. IT WAS HARD TO NOTI…
POWER TRAIN
87 complaint(s)
TRANSMISSION SHIFTS HARD WHEN SHIFTING UP AND WHEN DOWNSHIFTING. VEHICLE JERKS WHEN GOING SPEEDS <40 AFTER COMING OFF HIGHWAY AT HIGHWAY SPEEDS >70.
ELECTRICAL SYSTEM
46 complaint(s)
The console radio dash has gone completely black while both driving and while using it for the speaker/phone system. The incident resulted in the entire system restarting.
ENGINE AND ENGINE COOLING
39 complaint(s)
The contact owns a 2021 GMC Sierra 1500. The contact stated that there was an abnormal ticking sound coming from the vehicle while idling. There was no warning light illuminated. The vehicle was taken…
STEERING
25 complaint(s)
The contact owns a 2021 GMC Sierra 1500. The contact stated while the vehicle was standstill, the steering wheel seized. The contact stated no warning light was illuminated. The contact called the loc…
UNKNOWN OR OTHER
25 complaint(s) · 1 reports a crash, fire, injury or death
The only way to get the heater to work on your feet is to turn off defrost, turn on only feet, turn on AC and sync both sides. I live in North Idaho and when you do this your windshield fogs up and f…
FUEL/PROPULSION SYSTEM
20 complaint(s)
I have had my gmc sierra 1500 for 2 weeks and it has less then 200 miles on it the first week I lost power the check engine light, air bag and traction control light started flashing and since then my…
SERVICE BRAKES
17 complaint(s) · 1 reports a crash, fire, injury or death
The contact owns a 2021 GMC Sierra 1500. The contact stated that the grandson was driving in stop-and-go traffic, the braking system suddenly malfunctioned causing the vehicle to crash into the rear o…
LATCHES/LOCKS/LINKAGES
6 complaint(s)
The contact owns a 2021 GMC Sierra 1500. The contact stated while the vehicle was parked and turned off, the electronic rear tailgate door erroneously unlatched and opened. The contact stated that the…
SUSPENSION
6 complaint(s)
On 22 December 2020, I received a 2021 GMC Sierra 1500 SLT X31 Truck. The day that I drove it I notice that the Truck was riding as though it had a low Tire issue. It was riding bouncy. I had no lo…

The 10 components named in the most complaints are shown, of 38 named in all.

These complaints are filed under SIERRA 1500, a name NHTSA also uses for other versions of this car, so some may concern those versions.

Data sources