Four problems related to power train have been reported for the 2006 GMC Yukon. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 GMC Yukon based on all problems reported for the 2006 Yukon.
This is the 2nd GMC Yukon with a faulty drivetrain I've acquired in 3 years. Both occasions were directly after the vehicle had professional service done related to the faulty system. The transmissions was fully serviced at reputable repair shops and within a month or 2, without warning, the transmissions started having mechanical issues without dtc being triggered. As well as a 2004 Buick rendezvous with less than 70k miles on it. The 2001 GMC Yukon suddenly lost reverse and park while driving and imploded the transmission in the process. The 2004 Buick rendezvous started slipping and ceased to move by it's own power when at operating temperature. The 2006 GMC Yukon denali stopped shifting gears while on the freeway at 55 mph and systematically lost all moving gears within a day also while at operating temperature.
The contact owns a 2006 GMC Yukon xl. While at a stop, the vehicle lost power and the traction control warning indicator illuminated. The vehicle accelerated eventually. The failure recurred several times. The vehicle was taken to an independent mechanic who performed an on-screen driving test, but was unable to find the failure codes. The dealer was contacted (john paul's GMC, greenfield, WI, 414-482-6246) and the technician stated that the failure could not duplicated because the dealer used the same diagnostic system as the independent mechanic. The vehicle was not taken to the dealer. The manufacturer was not made aware of the failure. The failure was not repaired. The failure mileage was approximately 180,000.
When accelerating from a red light and turning right, the powertrain suddenly disengaged, nearly causing an accident from unsuspecting drivers behind my Yukon. The engine remains on, the shifter (automatic) has not moved and indicates "drive". Moving the shifter to other gears did not help either. Thinking quickly, I turned off the engine, placed vehicle in "p", restarted, and shifted back to "d" which did not work. I then placed engine in "3" and was able to continue driving in third gear until arriving home. The GMC dealer said they could not find anything wrong, went ahead and changed a shift cable for $1,100 and I continue to have the same problem.
My 22 month old grandson was sitting in my 2006 GMC Yukon pretending to drive. My vehicle was not running the keys were in the vehicle the radio was playing, I was standing 3 feet from the vehicle with my back to it. I heard the transmission shift. I turned to see the vehicle rolling down the driveway. Luckily I have a short driveway and live on a cul-DE-sac. By the time I caught the vehicle and pushed the e brake to stop it I was at the end of my drive way. I thought I had to put my foot on the brake to take the vehicle out of park and into gear or neutral. Which is true unless the key is put into acc mode. I brought this to the dealer and the service writer and gm certified mechanic didn't know that if a vehicles key was in acc mode anyone can shift the gears around. Even my 22 month old grand son a safety feature for gm vehicles is a person has to step on the brake to take the vehicle out of park. The service writer and mechanic checked a few other vehicle around the shop and found this to work on everyone they tried. So much for the safety feature.