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GMC Sierra · Diesel
2020 · diesel, truck
7 measured figures
7 of the 10 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 economy26 mpg (US gallons)Measured by EPA · configuration: Sierra 2WD
Tailpipe CO₂244 g/kmMeasured by EPA · CO₂ basis: tailpipe_rated · configuration: Sierra 2WD · also 392 g/mile
HorsepowerFree with an accountMeasured for this car, with its publisher and basis
Kerb weightFree with an accountMeasured for this car, with its publisher and basis
EPA test weightFree with an accountMeasured for this car, with its publisher and basis
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

5 more measured figures for this car — Horsepower, Kerb weight, EPA test weight, Warranty, Recall campaigns — 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 (244 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
Engine horsepowerNot 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.
Complaints per 10,000 builtNot 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

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. Confidence is low: several components are modelled from class averages.

Known Issues

ENGINE
41 complaint(s)
Rear main oil seal failure causing truck to lose all oil, leaking all over truck, trail leading to drive and garage; possibility of engine seizing up while driving causing an accident, confirmed by de…
POWER TRAIN
28 complaint(s)
TRANSMISSION KICKS WHEN COMING TO A COMPLETE STOP.
ELECTRICAL SYSTEM
21 complaint(s)
REVIEW CAMERA IS EXTREMELY BRIGHT WHEN BACKING. IT'S SO BRIGHT THAT A GLARE IS THROWN ONTO REAR WINDOW MAKING IT NEXT TO IMPOSSIBLE TO SEE OUT REAR WINDOW OR USE SIDE VIEW MIRRORS. I OFTEN REVERT TO T…
UNKNOWN OR OTHER
9 complaint(s)
Engine light came on while driving / aligned to transmission temp sensor error and brake sensor GM Maintenance was able to diagnosis that the Temperature Loop Coolant Pump had failed and needed to be…
SERVICE BRAKES
6 complaint(s)
TL* THE CONTACT OWNS A 2020 GMC SIERRA 1500. THE CONTACT STATED THAT WHILE DRIVING AT 52 MPH, THE BRAKE PEDAL WAS DEPRESSED BUT WAS VERY FIRM. THE PARK BRAKE WAS ACTIVATED BUT FAILED TO EFFECTIVELY ST…
STEERING
5 complaint(s)
TL* THE CONTACT OWNS A 2020 GMC SIERRA 1500. THE CONTACT STATED THAT THE VEHICLE WAS AT A STAND STILL IN A HOSPITAL PARKING LOT, WHEN THE STEERING WHEEL CEASED. THE CONTACT STATED THAT THE POWER STEER…
FUEL/PROPULSION SYSTEM
4 complaint(s)
SUSPENSION
3 complaint(s)
My 2020 GMC Sierra Denali diesel with approximately 90,000 miles experienced two separate front suspension failures within a short period of time. The driver side tie rod and wheel hub failed first an…
ENGINE AND ENGINE COOLING
2 complaint(s)
The contact owns a 2020 GMC Sierra 1500. The contact stated while driving 70 MPH, the low oil pressure warning light illuminated. The contact pulled over to the side of the road and noticed that the o…
ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:UREA INJECTION SYSTEM (DEF)
2 complaint(s)
The contact owns a 2020 GMC Sierra 1500. The contact stated that while starting the vehicle, the engine hesitated while turning over. The vehicle started with the check engine warning light illuminate…

The 10 components named in the most complaints are shown, of 18 named in all.

These complaints are filed under SIERRA 1500, SIERRA DENALI, names that include one NHTSA also uses for other versions of this car, so some may concern those versions.

Data sources