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Transport Canada + NRCan

2021 GMC Sierra HD

Everything Canada’s open data holds on this vehicle: what has been recalled, what it costs to run, and how efficient it is compared with everything else on the road.

Recalls

3

3 current

Combined

13.7L/100 km

Fuel, a year

$3,450

16,249 km, Ontario prices

Recalls

Good news: Recall repairs are almost always free. Book with any manufacturer dealer and quote the recall number. Transport Canada’s own wording is that a manufacturer “will almost always make these repairs free of charge”, so being asked to pay for recall work is unusual and worth questioning. Since 2018 the Minister of Transport can order a company to pay for repairs so owners do not bear the cost.

Structure

Transport Canada recall 2024061 · manufacturer campaign N232426400

1 February 2024

Transport Canada lists: Silverado HD 2020–2024 · Sierra HD 2020–2024

What is wrong

On certain trucks, water could leak into the exterior tailgate switch. As a result, the tailgate could unlatch and open unexpectedly while parked. If this happens, cargo that is not secured could fall out of the truck bed and onto the road when the vehicle is moving. Note: This recall only affects trucks equipped with a power-locking tailgate.

Why it matters

Cargo that falls from the truck bed could create a road hazard for others and increase the risk of a crash.

What the dealer will do

General Motors will notify owners by mail and advise you to take your truck to a dealership to replace the exterior tailgate switch. To reduce the safety risk, General Motors recommends that you should inspect the tailgate to ensure it's closed and latched before driving.

249,132 vehicles affected in CanadaLight Truck & VanSafety TC

Brakes

Transport Canada recall 2021602 · manufacturer campaign N212349181

29 September 2021

Transport Canada lists: Silverado HD 2021–2022 · Sierra HD 2021

What is wrong

On certain trucks, the bolts that attach the brake pressure modulator valve (BPMV) assembly may not be properly tightened. As a result, water can enter the BPMV and cause a short circuit.

Why it matters

A short circuit can create the risk of a fire.

What the dealer will do

General Motors will notify owners by mail and instruct you to take your truck to a dealer to replace the brake pressure modulator valve assembly. General Motors recommends that you should park your truck outside, and not in a garage or other structure, until the recall repairs are completed.

248 vehicles affected in CanadaLight Truck & VanSafety Mfr

Seats And Restraints

Transport Canada recall 2020645 · manufacturer campaign N202322231 / N202322232 / N202322233 / N202322235

23 December 2020

Transport Canada lists: Blazer 2021 · Colorado 2021 · Silverado HD 2021 · Canyon 2021 · and 3 more

What is wrong

On certain vehicles, the seat belts may have been installed with the wrong bolts. As a result, the seat belt may not be properly attached and may not work as designed in a crash.

Why it matters

A seat belt that does not work properly could increase the risk of injury in a crash.

What the dealer will do

General Motors will notify owners by mail and instruct you to take your vehicle to a dealer to replace the seat belt bolts, as necessary.

41 vehicles affected in CanadaLight Truck & VanSafety Mfr

Efficiency and running cost

Class
Pickup truck: Standard
In its class
More efficient than 40% of 115 2021 vehicles in this class
Tailpipe CO₂
321 g/km

Set your own distance and pump price · Full efficiency ranking

Watch this vehicle

Recall letters go to whoever owns the car on paper, which may not be you. Save your 2021 GMC Sierra HD and we will email you the day Transport Canada issues a new recall for it.

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Common questions

Does the 2021 GMC Sierra HD have any recalls?
Transport Canada has 3 recalls on record for the 2021 GMC Sierra HD. Recall repairs are almost always free at a manufacturer dealer.
What fuel economy does the 2021 GMC Sierra HD get?
NRCan rates the 2021 GMC Sierra HD at 13.7 L/100 km combined, emitting 321 g of CO2 per kilometre. There are 32 rated versions; this is the median.
What does it cost to run a 2021 GMC Sierra HD for a year?
At 16,249 km a year and Ontario average prices, about $3,450 in fuel, producing roughly 5,142 kg of CO2. Your own distance and prices will change this — the calculator lets you set both.

Source: Transport Canada — Vehicle Recalls Database; NRCan — Fuel consumption ratings. Data current as of 6 August 2026. Running cost uses Ontario average prices (155 ¢/L, 14.5 ¢/kWh), which are hand-maintained estimates. These are average residential rates. A car’s charging is added on top of what your home already uses, so on a tiered, time-of-use or subsidised tariff it is billed at your top rate rather than this average — which makes the real cost higher, especially in the territories. Enter your own rate for an accurate figure. 30,784 rated vehicles on file.