We have classified the 2 complaints from 2003 GMC Yukon XL 2500 about ELECTRICAL SYSTEM into the following categories.
While sitting idle my vehicle suddenly went into reduced engine power mode. i was able to get over and pull off the road and shut off the car. 5 minutes later the car started like there was no problem. over the next few days the rep warning would show up and my car would suddenly lose power. i was crossing the road during one incident. however, when i would shut off the car and restart the check engine light would go away as would the rep warning. after a quick review online it is easy to find hundreds of people who have a similar issue. gm will only diagnose and if the light is off when you get there there is nothing for them to do except take your money and say good luck.
June 8, 2010 all dash lights went out. the defective part was replaced in 2006 and has failed again. *tr
(1) there were no events leading up to the failure. (2) rpm gauge gets stuck on an rpm and will stay there and speedometer wont go to 0 lowest it goes is 10mph (3) haven't had a chance to correct this problem. *tr
Speedometer reading as much as 50mph over actual speed, causing safety issue. other gauges occasionally showing incorrect values (fuel, alternator, etc). *tr
Incorrect speedometer reading. sometimes reads zero on the highway, sometimes might read 40 or 50 while doing 55 (checked with gps). seems to happen more on really hot days, but also seems to be able to happen at any time (though it does not do it all of the time, it has been happening since mid-2006). *tr