GMC Terrain Quiz
Driving and Operation

Filling the DEF Tank

In this manual: Driving and Operation
Introduction — 1In Brief — 46Keys, Doors and Windows — 37Seats and Restraints — 60Storage — 6Instruments and Controls — 58Lighting — 16Infotainment System — 1Climate Control — 8Driving and Operation — 128Vehicle Care — 75Service and Maintenance — 8Technical Data — 5Customer Information — 18OnStar — 6Connected Services — 4
~1min read
GMC Terrain. Filling the DEF Tank

It is recommended to fill the DEF tank on a level surface and when the vehicle is not running. When adding fluid, it is recommended to top off the DEF tank.

Do not top off the DEF tank. When using a bottle or container to add DEF, follow the instructions on the container and use the special fill aid. In certain cold conditions, DEF may freeze in the DEF fill pipe opening. If this condition prevents filling the DEF tank, park the vehicle in a warm garage overnight.

For information on how to fill the DEF tank, see Filling the Fuel Tank (Gasoline) or Filling the Fuel Tank (Diesel).

Test yourself

A quick GMC Terrain quiz: every answer comes with an explanation and a link to the manual page.