2004 GMC Yukon XL 1500 Engine Problems

“Our yukon on numerous occasions will just display reduced engine power and speed will decrease rapidly. I have pulled off the road and turned vehicle off removed key waited a few minutes then started the truck and it may run fine or may just continue to have reduced engine power. Between the tow bills and shop fees I have spent more than the truck is worth. We have taken to the shop and spent over 5k for them to state the can not find an issue. They say there are no codes. Then it may or may not run normal for a short period and there is no pattern. …”

“When driving whether highway or city streets, the car will without notice slow down to about 15mph. A code of reduced engine power is displayed on the dash. The car will not go any faster than 15mph, even with you foot on the gas petal. I have had the car in the shop more times than I can count. They keep replacing different parts thinking that it would fix the problem. Almost within a week after being in the shop the same thing happens again without notice. I have noticed that other people are having the same problem. …”

“2004 Gmc yukon xl: while driving at normal speeds this vehicle will have a warning light come on that says reduced engine speed then it shuts down to 30 MPH instantly. There is no time for reaction. This problem occurs intermittently. It has happened over 50 times! A few of the times almost resulted in fatal consequences in high traffic. Took the vehicle to the dealer. They said it was the throttle body. Replaced throttle body and the next day had the same issue. Took it back to the dealer, they said it was now the accelerator pedal assembly. …”

“The contact owns a 2004 Gmc YUKON XL 1500. While driving approximately 60 MPH, the vehicle began to shake. The engine stalled and lost power. The stability system disabled and reduced engine power warning lights illuminated. The contact pulled over to the side of the road, turned off the engine, waited, and then restarted the vehicle. The vehicle was taken to a local dealer who was unable to duplicate and diagnose the failure. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 200,000.”

“Engine turn it self off while moving, doors lock it self, turn signals will not return after turning, then bright lights come on when selecting turn signals, loud rattling noise underneath the car; not sure what it could be.”