Owner complaints, recalls, fuel economy and safety ratings from public NHTSA and EPA data, updated Oct 17, 2026.
Fuel economy
19–20 mpgcombined; city 17–18, highway 23–24; every version of this model year
Five years of fuel
$16,240–$17,100U.S. average; Ohio $14,510–$15,280 at local prices; every version of this model year; fuel only, not other costs of owning it; 15,000 miles a year, at EIA fuel prices for the week of Oct 12, 2026
Owners have filed 20 complaints with NHTSA about the 2021 Frontier. These are unverified owner reports, counted by the part of the car they name; one complaint can name several parts. Counts aren't adjusted for how many were sold, so they don't show how reliable a car is.
Complaints by part of the car
Part
Complaints
Crashes
Fires
Injuries
Electrical system
6
1
0
0
Power train
5
0
0
0
Unknown or other
4
0
0
0
Air bags
3
0
0
0
Fuel/propulsion system
3
0
0
0
Engine
2
0
0
0
Service brakes
2
1
0
0
Exterior lighting
1
0
0
0
Forward collision avoidance
1
1
0
0
Seat belts
1
0
0
0
Seats
1
0
0
0
Suspension
1
0
0
0
2 more parts
Tires
1
0
0
0
Vehicle speed control
1
0
0
0
Complaints by model year
Newer years have had less time to collect complaints, and counts aren't adjusted for sales, so a shorter bar doesn't mean a more reliable year.
NHTSA lists 2 recall campaigns for the 2021 Frontier over its history. Campaigns are matched by model and year, so each one may apply to a given car, and its repair may already be done: check a VIN on NHTSA's recall lookup for the open recalls on that exact car.
Nissan North America, Inc. (Nissan) is recalling certain 2020-2023 Titan, 2020-2022 Frontier, and 2023 Z vehicles. The transmission parking pawl may not engage when the vehicle is shifted into park, which can result in a vehicle rollaway.
Risk: A vehicle rollaway increases the risk of a crash.
Remedy: Owners are advised to apply the parking brake every time they park their vehicle. Dealers will perform the applicable repairs below, free of charge: • Model Year 2020-2022 Frontier vehicles: reprogram Transmission Control Module (TCM) • Model Year 2020-2022 Titan vehicles: reprogram TCM and Engine Control Module (ECM) • Model Year 2023 Titan vehicles: reprogram TCM • Model Year 2023 Z vehicles: reprogram TCM. Owner notification letters were mailed October 28, 2022. Owners may contact Nissan's customer service at 1-800-867-7669.
Nissan North America, Inc. (Nissan) is recalling certain 2020-2022 Frontier and Titan vehicles. The transmission parking pawl may not engage when the vehicle is shifted into park, which can result in a vehicle rollaway.
Risk: A vehicle rollaway increases the risk of a crash.
Remedy: Owners are advised to apply the parking brake every time they park their vehicle. Dealers will replace the transmission parking pawl pin, free of charge. Owner notification letters were mailed November 2022. Owners may contact Nissan's customer service at 1-800-867-7669. Nissan's number for this recall is R22A2 R22A3.
Carmakers sent NHTSA 60 service bulletins and notices that cover the 2021 Frontier, the latest on Apr 13, 2026. They tell dealers how to fix known issues.
The parts they mention most: electrical system (27), power train (14), equipment (9), engine and engine cooling (6), structure (5).
NHTSA hasn't opened a defect investigation that covers this model year.
Maintenance
Oil
The owner's manual gives the oil and how often to change it. We show oil facts only once we've checked them against the manual, and we haven't yet for the 2021 Frontier.
EPA class: standard pickup trucks. EPA greenhouse gas score: 3–4 out of 10. Each version EPA tested:
Swipe the table sideways for more columns.
Version
Engine
Transmission
Fuel
City / hwy / comb
Frontier Rear-Wheel Drive
3.8 L, 6 cyl
Automatic (S9)
Regular Gasoline
18 / 24 / 20
Frontier Part-time 4-Wheel Drive
3.8 L, 6 cyl
Automatic (S9)
Regular Gasoline
17 / 23 / 19
Sources and dates
U.S. EPA fuel economy data, file of Sep 29, 2026
NHTSA owner complaints, file of Oct 17, 2026
NHTSA recalls, file of Oct 17, 2026
NHTSA manufacturer communications, file of Oct 17, 2026
NHTSA defect investigations, file of Oct 17, 2026
NHTSA 5-Star Safety Ratings, file of Aug 7, 2026
U.S. Energy Information Administration, file of Oct 12, 2026
Fuel cost: EPA mpg with fuel prices for the week of Oct 12, 2026 and electricity prices for Jul 2026. Source: U.S. Energy Information Administration (Oct 2026). Complaints are unverified reports owners filed with NHTSA. About the data