Owner complaints, recalls, fuel economy and safety ratings from public NHTSA and EPA data, updated Oct 17, 2026.
Fuel economy
23–32 mpgcombined; city 21–28, highway 26–39; every version of this model year
Five years of fuel
$11,600–$17,500U.S. average; Ohio $10,370–$16,490 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 224 complaints with NHTSA about the 2018 Terrain. 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
Service brakes
70
2
0
1
Engine
55
0
1
0
Power train
41
2
0
2
Electrical system
35
1
1
0
Unknown or other
35
1
0
0
Air bags
14
7
0
9
Service brakes, hydraulic
13
0
0
0
Fuel/propulsion system
12
2
0
2
Forward collision avoidance
8
1
0
0
Vehicle speed control
8
1
0
0
Electronic stability control (ESC)
7
0
0
0
Steering
7
2
0
2
18 more parts
Visibility/wiper
4
0
0
0
Seat belts
3
1
0
1
Seats
3
0
0
0
Structure
3
1
0
0
Suspension
3
1
0
0
Fuel system, diesel
2
0
0
0
Fuel system, gasoline
2
0
0
0
Lane departure
2
0
0
0
Wheels
2
0
0
0
Back over prevention
1
0
0
0
Carry handle, shell, base
1
0
0
0
Engine and engine cooling
1
0
0
0
Exterior lighting
1
0
0
0
Latches/locks/linkages
1
0
0
0
Service brakes, air
1
0
0
0
Tether, lower anchor (ON CAR SEAT OR VEHICLE)
1
0
0
0
Tires
1
0
0
0
Visibility
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 5 recall campaigns for the 2018 Terrain 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.
General Motors LLC (GM) is recalling certain 2018-2019 Chevrolet Cruze and Buick LaCrosse, 2018-2020 Chevrolet Equinox, Chevrolet Traverse and GMC Terrain, 2018 Chevrolet Malibu, 2019-2020 Buick Encore, Buick Enclave, Cadillac XT4, Chevrolet Blazer and GMC Acadia, and 2020 Cadillac XT6 vehicles. The start/stop accumulator endcap may have missing bolts.
Risk: Missing bolts on the start-stop accumulator endcap could result in a transmission oil leak and may progress to a loss of propulsion, increasing the risk of a crash. A transmission fluid leak in the presence of an ignition source may increase the risk of fire.
Remedy: GM will notify owners, and dealers will inspect the start-stop transmission accumulator and replace it if any bolts are missing, free of charge. The recall began December 15, 2020. Owners may contact GMC customer service at 1-888-988-7267, Buick Customer service at 1-866-608-8080, Chevrolet customer service at 1-800-222-1020 or Cadillac customer service at 1-800-458-8006. GM's number for this recall is N202313440.
General Motors LLC (GM) is recalling certain 2018-2019 Chevrolet Equinox, Impala, Cruze, Volt and Bolt EV vehicles, GMC Terrain vehicles, Buick Lacrosse and Regal vehicles, Cadillac XTS and XTS Professional vehicles and 2018 Chevrolet Malibu vehicles. The rear brake caliper pistons may have an insufficient coating causing gas pockets to form, potentially reducing rear brake performance.
Risk: A reduction of braking performance can increase the risk of a crash.
Remedy: GM will notify owners, and dealers will bleed the vehicle's brake system, free of charge. The recall began October 11, 2018. Owners may contact Buick customer service at 1-800-521-7300, Cadillac customer service at 1-800-458-8006, Chevrolet customer service at 1-800-222-1020, or GMC customer service at 1-800-462-8782. GM's number for this recall is 18279.
General Motors LLC (GM) is recalling certain 2015-2018 GMC Canyon, 2016-2017 Buick Envision, 2016-2018 Chevrolet Colorado and Malibu, 2017-2018 GMC Acadia, 2018 Buick LaCrosse, Cadillac ATS, Chevrolet Equinox, and GMC Terrain vehicles. The high pressure fuel pump may detach from its mounting flange, possibly resulting in the pump damaging the high pressure fuel line.
Risk: A damaged fuel line can create a fuel leak, increasing the risk of a fire.
Remedy: GM will notify owners, and dealers will replace the high pressure fuel pump, and high pressure fuel pipe, free of charge. The recall began July 2, 2018. Owners may contact Buick customer service at 1-800-521-7300, Cadillac customer service at 1-800-458-8006, Chevrolet customer service at 1-800-222-1020, or GMC customer service at 1-800-462-8782. GM's number for this recall is 18188.
General Motors LLC (GM) is recalling certain 2018 GMC Terrain vehicles. The sensing diagnostic module (SDM) that senses a crash and deploys the necessary air bags may not power down correctly when the vehicle is shut off, causing it to be inoperative when the vehicle is restarted.
Risk: If the SDM becomes inoperative, it will not detect a crash or command the necessary air bag deployment, increasing the risk of injury in the event of a crash.
Remedy: GM will notify owners, and dealers will reprogram the SDM with updated software, free of charge. The recall began June 29, 2018. Owners may contact GMC customer service at 1-800-462-8782. GM's number for this recall is 18179.
General Motors LLC (GM) is recalling certain 2018 Chevrolet Equinox and GMC Terrain vehicles and 2017-2018 GMC Acadia vehicles. The right front intermediate driveshaft may fracture and separate while driving.
Risk: If the front right intermediate drive shaft assembly separates while driving, the vehicle will lose propulsion, increasing the risk of a crash. If the assembly separates while parked on a grade, without the park brake engaged, the vehicle may move unintentionally, increasing the risk of a vehicle roll-away.
Remedy: GM will notify owners, and dealers will replace the right front intermediate drive shaft assembly, free of charge. The recall began August 25, 2017. Owners may contact GMC customer service at 1-800-462-8782 or Chevrolet customer service at 1-800-222-1020. GM's number for this recall is 17329.
Carmakers sent NHTSA 1,345 service bulletins and notices that cover the 2018 Terrain, the latest on Sep 26, 2026. They tell dealers how to fix known issues.
The parts they mention most: equipment (474), electrical system (306), engine and engine cooling (223), engine (145), power train (133).
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 2018 Terrain.
These are searches on those sites; we don't copy or check their listings. Your ZIP is used for these links and never kept.
Specs
EPA class: small sport utility vehicle. EPA greenhouse gas score: 5–6 out of 10. Each version EPA tested:
Swipe the table sideways for more columns.
Version
Engine
Transmission
Fuel
City / hwy / comb
Terrain Front-Wheel Drive
1.6 L, 4 cyl, turbo
Automatic 6-spd
Diesel
28 / 39 / 32
Terrain All-Wheel Drive
1.6 L, 4 cyl, turbo
Automatic 6-spd
Diesel
28 / 38 / 32
Terrain Front-Wheel Drive
1.5 L, 4 cyl, turbo
Automatic 9-spd
Regular Gasoline
26 / 30 / 28
Terrain All-Wheel Drive
1.5 L, 4 cyl, turbo
Automatic 9-spd
Regular Gasoline
24 / 28 / 26
Terrain Front-Wheel Drive
2.0 L, 4 cyl, turbo
Automatic 9-spd
Premium Gasoline
22 / 28 / 24
Terrain All-Wheel Drive
2.0 L, 4 cyl, turbo
Automatic 9-spd
Premium Gasoline
21 / 26 / 23
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