Car Problem Reports
GMC Yukon XL Denali Stalling or Low Engine Idle Speed Due to Dirty Throttle Body
GMC Yukon XL Denali Problem
Average Mileage: 111,585 mi (62,226 mi - 145,700 mi)
Truck idles really low, will stall sometimes when I make a slow turn
The vehicle would stall at idle. First thought it was an alternator problem since the alternator would drop to zero and the vehicle would stall. Put in new alternator. Same problem. Had throttle body cleaned by shop. Problem solved.
Visitor, 2003 GMC Yukon XL Denali, 120,000 mi
Regular maintenance (cleaning) of the throttle body is mandatory on the 6.0l engine.