Manufacturer communication — 2006 GMC YUKON DENALI XL

• GM passenger cars and trucks, model years 2000 to 2024.

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  GM Passenger Cars and Trucks 2000 2024

• A sag or hesitation may be noticed when coasting at low speeds of less than 24 km/h (15 mph) with a closed throttle and then aggressively applying the throttle.

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  When coasting at low speeds of less than 24 km/h (15 mph) with a closed throttle and then aggressively applying the throttle.

• With an automatic transmission, after a hard complete stop with a closed throttle immediately followed by an aggressive throttle opening, the downshifts may not be completed by the time the throttle is opened.

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  Also, in a vehicle equipped with an automatic transmission when making a hard, complete stop with a closed throttle, immediately followed by an aggressive throttle opening, the transmission downshifts may not be completed by the time the throttle is opened.

• A sag or hesitation may also be noticed while cruising at highway speeds and then aggressively increasing the throttle, forcing a down-shift.

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  Customers may also comment on a sag or hesitation while cruising at highway speeds and then aggressively increasing the throttle, forcing a down-shift.

Possible causes

• In this maneuver the throttle blade is opened slowly for up to 0.7 seconds, even though the accelerator is applied aggressively, to help minimize driveline lash and clunking.

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  In this type of maneuver, even though the accelerator is applied aggressively, the throttle blade is opened slowly for up to 0.7 seconds to help minimize driveline lash and clunking.

• As a result, approximately 0.5 seconds of zero torque may be commanded to allow the shift to first gear to occur.

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  As a result, approximately 0.5 seconds of ″zero″ torque may be commanded to allow the shift to first gear to occur.

Caution

• All of these conditions are a result of Torque Management and should be considered normal; no repairs should be attempted.

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  All of the above conditions are a result of Torque Management, and all of these conditions should be considered normal. No repairs should be attempted.