GMC 2500 diesel hd sle Sierra rearwheel drive instrument panay is inoperative. Have to use iphone for speed and guess at gas effecting cruise control interior lights fan speed and cd player

- Reese, MI, USA

(electrical) as an ongoing issue, the dashboard gauges/indicators (I.e. tach, speedometer, etc..) will sometimes not register until several minutes after the vehicle has been running (this could be for up to miles) it has not affected vehicle performance to date. (fuel/propulsion system) I have begun having issues where it goes into "reduced engine power". further diagnostic attempts have led me to believe that it is due to a faulty throttle position sensor (part of the throttle body), tac module, or app assembly (accelerator pedal). Most likely cause may be due to the throttle position sensor, as this issue has happened when the vehicle is on "cruise control". however, due to the inferior design of the throttle body unit itself, the manufacture has made it difficult or if designed to be impossible to replace just the tps, by riveting the tps to the throttle body, and may have to replace the whole throttle body. I am having the vehicle serviced for a complete diagnostic and repair, and will elaborate further upon successful repair if desired.

- Groton, CT, USA

When placed in park then turned off the key wouldn't come out of the ignition, when placed in drive while running the key would come out freely.

- Boise , ID, USA

The contact owns a 2003 GMC Sierra 2500. While driving less than 45 mph, the speedometer displayed 120 mph. The contact shut off the vehicle and restarted it to see if the speedometer would reset itself. The vehicle was taken to the dealer, but they would not perform repairs because it was not covered under the warranty. The failure and current mileages were 104,571.

- Deforest, WI, USA