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2018 GMC

Terrain FWD

Auto 6-spd, 4 cyl, 1.6 L, Diesel, Turbo

GMC Terrain: best and worst years
2018 GMC Terrain FWD

Closest available photo (2019 model year); you're viewing the 2018.

2019 photoKevautoCC BY-SA 4.0Wikimedia Commons

Overview

Body
Small Sport Utility Vehicle 2WDEPA, from EPA, last updated 6/11/2026
Drivetrain
Front-Wheel DriveEPA, from EPA, last updated 6/11/2026
Transmission
Automatic 6-spdEPA, from EPA, last updated 6/11/2026
Powertrain
DieselEPA, from EPA, last updated 6/11/2026
Fuel
DieselEPA, from EPA, last updated 6/11/2026

Engine & performance

Cyl
4EPA, from EPA, last updated 6/11/2026
Aspiration
TurbochargedEPA, from EPA, last updated 6/11/2026
Start-stop system
YesEPA, from EPA, last updated 6/11/2026

Efficiency

MPG Hwy
39 mpgEPA, from EPA, last updated 6/11/2026
MPG City
28 mpgEPA, from EPA, last updated 6/11/2026
MPG Comb
32 mpgEPA, from EPA, last updated 6/11/2026
Fuel $/yr
$2,450EPA, from EPA, last updated 6/11/2026
CO₂
319 g/miEPA, from EPA, last updated 6/11/2026
Eco Score
6/10EPA, from EPA, last updated 6/11/2026
Smog score
3/10
Elec. Range
0 miEPA, from EPA, last updated 6/11/2026
Real-world MPG
39.4 mpg, reported by 2 driversabout 7.4 mpg above the EPA combined estimate
SmartWay certified
No

Dimensions & capacity

Length
183 inNHTSA vPIC, from NHTSA vPIC, last updated 6/5/2026
Width
72 inNHTSA vPIC, from NHTSA vPIC, last updated 6/5/2026
Height
65 inNHTSA vPIC, from NHTSA vPIC, last updated 6/5/2026
Wheelbase
107 inNHTSA vPIC, from NHTSA vPIC, last updated 6/5/2026
Curb Weight
3,327 lbNHTSA vPIC, from NHTSA vPIC, last updated 6/5/2026
Pass. Vol
104 ft³EPA, from EPA, last updated 6/11/2026
Cargo Vol
30 ft³EPA, from EPA, last updated 6/11/2026

Safety NHTSA, model year

Overall crash rating
★★★★
Rollover rating
★★★★
Stability control (ESC)
Standard
Forward-collision warning
Optional
Lane-departure warning
Optional
Recalls
5
Owner complaints
212
Reported injuries
12

Reported problems NHTSA owner complaints, model year

  • SERVICE BRAKES20%
  • ENGINE16%
  • POWER TRAIN13%
  • ELECTRICAL SYSTEM11%
  • UNKNOWN OR OTHER10%
  • AIR BAGS4%

Source: NHTSA owner complaints, 316 total.

GMC Terrain: best and worst years

Known issues manufacturer service bulletins, model year

1,039 service bulletins filed with NHTSA for this model year

  • Apr 1, 2026UNKNOWN OR OTHERPIT3271Q

    This preliminary information communicates information about how to determine if a wheel and tires size change is available.

  • Mar 27, 2026UNKNOWN OR OTHERPIT5992B

    This preliminary information discusses a condition that may arise from the drivers window switch sending an errant message causing the vehicle to enter manual fob learn mode.

  • Mar 9, 2026UNKNOWN OR OTHERPIP6104

    This Preliminary information communicates the steps on how to save a GDS2 Session Log and upload to a Technical Assistance Case in CX Connect.

  • Mar 9, 2026UNKNOWN OR OTHERPIP4902V

    This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance.

  • Jan 8, 2026UNKNOWN OR OTHERPIP4902U

    This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance.

  • Nov 20, 2025UNKNOWN OR OTHERPIT5214G

    This Preliminary Information communication provides information to the technician about vehicles that have had multiple repair attempts that are being performed on customer’s vehicles that exhibit vibration conditions without utilizing the support of General Motors Technical Assistance Center. If valid vibration frequency or Road Force Variation data has been collected and a repair attempt does not correct the customer complaint, contact General Motors Technical Assistance Center for further sup

  • Sep 9, 2025UNKNOWN OR OTHER13598

    New Vehicle Monitoring Programs Section in IVH

  • Aug 27, 2025UNKNOWN OR OTHERPIT5578E

    This preliminary information advises technicians the heater hose clamps are one time use only.

  • and 1,031 more

Source: NHTSA manufacturer communications (technical service bulletins).

Warranty manufacturer terms, by make

Basic
3 yr / 36k mi
Powertrain
5 yr / 60k mi
Roadside assistance
5 yr / 60k mi
Maintenance
1 yr / 12k mi
EV battery
8 yr / 100k mi

Information is gathered on a best-effort basis from public sources, may be incomplete or out of date, and is not purchasing or financial advice. Verify with the manufacturer or dealer before buying.