GMC Terrain: Driving and Operating / Diesel Exhaust Fluid

Warning

Avoid getting Diesel Exhaust Fluid (DEF) on your skin or in your eyes as it could cause irritation. For more safety, handling, and storage information, see the Diesel Exhaust Fluid container label.

Diesel Exhaust Fluid (DEF) is used with diesel engines to reduce the amount of regulated emissions produced. Products such as AdBlue are types of DEF, and are approved for use in the vehicle as long as they have an API certification label or meet ISO 22241.The fluid level in the DEF tank must be maintained for the vehicle to run properly. DEF is not a fuel additive. DEF should not be mixed with or added to diesel fuel. DEF freezes when exposed to temperatures below −11 °C (12 ° F).

It is normal to hear the DEF system purge fluid back into the tank after the vehicle is shut off.

Locating Diesel Exhaust Fluid

DEF can be purchased at your dealer. It can also be purchased at authorized vehicle and truck dealerships. Additionally, some diesel truck fueling stations or retailers may have DEF for purchase. For vehicles with an active OnStar or connected services plan, OnStar can help to locate a DEF retailer. See Customer Assistance Offices for phone numbers to assist in contacting a GM dealer. See Recommended Fluids and Lubricants.

• Filling the DEF Tank
• Exhaust Fluid Low
• Exhaust Fluid Quality Poor
• Service Exhaust Fluid System
• Service Emission System