hardly worth mentioning
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
157,624 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2003 GMC Sierra 2500 electrical problems

electrical problem

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2003 GMC Sierra 2500 Owner Comments

problem #3

Apr 092015

Sierra 2500

  • 142,000 miles


(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

problem #2

May 012014

Sierra 2500 8-cyl Diesel

  • 226,300 miles
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

problem #1

Oct 072008

Sierra 2500

  • 104,571 miles
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

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