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GMC Customer Service (New Vehicle Purchase)
1 (888) 988-7267
Monday – Friday: 8 a.m. to 9 p.m. (EST)
Saturday: 9 a.m. to 6 p.m. (EST)
Sunday: Closed

Website : –

GM Mobility Center Number
Monday – Friday: 8 a.m. to 8 p.m. (EST)
Saturday & Sunday: Closed


Customer Relations Center Number
Monday – Saturday: 8 a.m. to 9 p.m. (EST)
Sunday: Closed

GMC Online Owner Center Number
Monday – Saturday: 8 a.m. to 9 p.m. (EST)
Sunday: Closed
(for questions about managing your vehicle on

GMC Service Bulletins
Monday – Friday: 8 a.m. to 6 p.m. (EST)
Saturday & Sunday: Closed
(to order service bulletins about your GMC)


Apply GM Rewards Card
BuyPower Card :  1-800-460-2845
GM Extended Family Card : 1-877-557-2622
24 hours a day, 7 days a week

Auto: 1-888-925-ALLY (2559)
Monday – Friday: 8 a.m. to 8 p.m. (EST)
Saturday: 9 a.m. to 4 p.m. (EST)
Sunday: Closed

GM Financial
Monday – Thursday: 8 a.m. to 7 p.m. (EST)
Friday: 8 a.m. to 6 p.m. (EST)
Saturday: 8 a.m. to 3 p.m. (EST)
Sunday: Closed

US Bank
Monday – Friday: 8 a.m. to 9 p.m. (EST)
Saturday: 9 a.m. to 7 p.m. (EST)
Sunday: Closed


Monday – Friday: 8 a.m. to Midnight (EST)
Saturday: 9 a.m. to Midnight (EST)
Sunday: 11 a.m. to Midnight (EST)

Write to GMC

United States:
GMC Customer Assistance Center
P.O. Box 33172
Detroit, MI 48232-5172

Canada – GM of Canada
1908 Colonel Sam Oshawa, Ontario
L1H 8P7, Canada
Mail Code 163-055

Reference Links –

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Entertainment & Connectivity
Q Can I purchase a GMC directly from the factory?

No. However, you may order a vehicle from the factory through an authorized GMC dealer. To locate a GMC dealer please visit the GMC Dealer Locator.

Q What is Payload?

Payload is the maximum allowable weight of cargo to be carried in a vehicle, including all occupants and optional equipment. It is computed by subtracting curb weight from GVWR.

Q What is GMC 100,000-Mile/5-year Powertrain Warranty?

All 2007 through 2014 passenger cars and light duty trucks are covered. The Powertrain Limited Warranty is 100,000 miles or 5 years (whichever comes first). It is fully transferable and there are no fees and no deductibles. The Roadside Assistance and Courtesy Transportation programs are also 100,000 miles or 5 years (whichever comes first). For more details, please visit your GMC dealer or click here.

Q What makes GMC Certified Service technicians different?

From oil changes to engine replacements, these automotive experts, nationwide, are trained to care for your vehicle’s special needs, undergoing 1 million hours of instruction annually. They use the latest and most advanced diagnostic equipment available. Both ACDelco and Genuine GM Parts are tested for performance and reliability. So no matter what kind of vehicle you own, trust it to the Certified Service technicians at your GMC dealer.

Q Is GMC currently offering any incentives or Special Offers?

Incentive offers vary throughout the year. To see GMC’s national or regional incentives visit the GMC Special Offers page or, to inquire about any potential local offers, visit the GMC Dealer Locator. If you would prefer to contact us by phone, we can be reached at 1-800-462-8782 Monday - Friday, from 8:00 a.m. to 9:00 p.m. (Eastern Standard Time) and Saturday 9:00 a.m. to 6:00 p.m. (Eastern Standard Time).

Q How can I obtain additional information on a new GMC before the vehicle is produced?

Most new GMC launch vehicles have a link on their product page that allows consumers to sign up and receive email updates as additional information becomes available on the new launch vehicle.

Q What is OnStar Vehicle Diagnostics?

OnStar Vehicle Diagnostics is an exclusive new service that runs diagnostic checks on a vehicle's key operating systems and sends the customer monthly reports by e-mail. It's available only from OnStar and GM – just one more way OnStar helps give you peace of mind on the road. Visit for more information.

Q What is E85 Ethanol?

E85 Ethanol, a blend of 85% ethanol and 15% gasoline, is a renewable fuel made mostly from U.S.-grown corn. E85 Ethanol Flexible Fuel Vehicles (FFV) are designed to run on E85, gasoline, or any blend of the two.

Q Can I take my GMC to any GM dealership for warranty repairs?

These repairs must be performed by an Authorized GMC dealer, except in an emergency situation when a covered part or a GMC dealer is not reasonably available to the vehicle owner. It's in your best interest to take your GMC vehicle to a GMC dealer for all repairs since they are the most knowledgeable about the particulars of your vehicle.

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  • Tuesday08:00 AM - 09:00 PM
  • Wednesday08:00 AM - 09:00 PM
  • Thursday08:00 AM - 09:00 PM
  • Friday09:00 AM - 06:00 PM

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