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Are you following the numbers and procedure in the back of the owners manual?

 

in the U.S., call  1-800-462-8782. 

Is this the one you tried? 

 

 

We encourage you to call the toll-free number in order to give your inquiry prompt attention.

 

Have the following information available to give the Customer Assistance representative:

 

. Vehicle Identification Number (VIN).

This is available from the vehicle registration or title, or the plate at the top left of the instrument panel and visible through the windshield.

 

. Dealership name and location.

 

. Vehicle delivery date and present mileage.

 

 

When contacting GMC, remember that your concern will likely be resolved at a dealer's facility.

That is why we suggest following Step One first. 

 

 

 

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