GMC 2001 Envoy - Manual (Page 446)

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REPORTING SAFETY DEFECTS
TO GENERAL MOTORS
In addition to notifying NHTSA (or Transport Canada)
in a situation like this, we certainly hope you’ll notify
us. Please call us at 1
- 800 - GMC - 8782
(1 - 800 - 462 - 8782), or write:
Pontiac-GMC Customer Assistance Center
P.O. Box 33172
Detroit, MI 48232
- 5172
In Canada, please call us at 1 - 800 - 263 - 3777 (English)
or 1 - 800 - 263 - 7854 (French). Or, write:
General Motors of Canada Limited
Customer Communication Centre, 163-005
1908 Colonel Sam Drive
Oshawa, Ontario L1H 8P7