Home › Forum › GMC › 2017 GMC Sierra 2500HD Diesel Denali Service Manuals. This topic contains 0 replies, has 1 voice, and was last updated by jrrivera 1 week, 3 days ago. Author Posts June 15, 2017 at 1:00 pm #165243 jrriveraParticipant Are the Service Manuals for 2017 GMC Sierra’s available anywhere ? (Helm do not show them as available). Author Posts You must be logged in to reply to this topic.