We have classified the 4 complaints from 2003 GMC Sierra 2500 about ELECTRICAL SYSTEM into the following categories.
(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. *tr
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. *tr
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
Tl*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.
Tl*the contact owns a 2003 gmc sierra 2500. the contact stated that the heater light failed first followed by the driver's side instrument panel lighting. he took the vehicle to the dealer and they stated that the failure was not covered. the passenger side of the instrument panel failed later and the entire panel went black. the vehicle will be repaired at the contact's expense. the failure mileage was 69,000 and the current mileage was unknown.updated 06/17/09. *lj the dashboard lights and gauges failed completely. updated 06/17/09.*jb
The vehicle has had failure of the air conditioner and heating. resulted in fired in the dash board wiring twice. had been in the shop for heating and air conditioner eight times. *jb