Question about GMC Cars & Trucks
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Posted on Jan 02, 2017
SOURCE: I have a 2004 GMC
Clean your throttle body for starters. When this is filthy, and it will be filthy, the throttle body will learn some bad habits. So the engine will go into a safe mode "reduced power". Clean the TB with TB cleaner with the battery disconnected, must be nice and shiny front and back. When finished, connect the battery back up and drive around for 20 minutes or so with all accessories off. This way the computer will re-learn a newly cleaned, properly functioning throtte body. This seams to be the main culprit with this problem. Hope this helps!
Posted on Feb 09, 2011
U need to reset security system (pass lock II). Turn key to on right b4 cranking but don't start and let security light flash for about 10-12 mins until it stops and then turn key back off, repeat procedure two more times don't actually turn key far enough to start during first two 10-12 min cycles, third cycle though after flashing stops turn the rest of the way forward for it to start. This should then reset security and solve problem sometimes only takes two cycles to reset. Good luck, hope this is helpful & solves problem.
Posted on Nov 23, 2013
Testimonial: "Thanks for you input but it didn't work. Any other suggestions?"
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