hardly worth mentioning
Crashes / Fires:
0 / 1
Injuries / Deaths:
0 / 0
Average Mileage:
142,436 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 fuel system problems

fuel system problem

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2003 GMC Sierra 2500 Owner Comments

problem #4

Jul 182015

Sierra 2500

  • 100,010 miles


Brake line rusted through and lost all braking capability. Luckly it happened pulling into my driveway and not on the highway! fuel lines rusted through and leaking fuel puddling onto the ground.

- Glen Burnie, MD, USA

problem #3

Jun 152014

Sierra 2500

  • 209,000 miles
The contact owns a 2003 GMC Sierra 2500. The contact stated that after inspecting the vehicle, he noticed that the oil level was elevated. The vehicle was taken to an independent mechanic where it was diagnosed that the fuel injectors needed to be replaced. The vehicle was repaired however, the failure recurred after approximately 30,000 miles and the vehicle was emitting smoke. The vehicle was repaired with new fuel injectors but the failure recurred. The manufacturer was not made aware of the failure. The failure mileage was 209,000.

- Platte, SD, USA

problem #2

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 #1

Jan 012014

Sierra 2500

  • 118,736 miles
The contact owns a 2003 GMC Sierra 2500. While driving various speeds, the contact noticed excessive fumes coming from the exhaust of the vehicle. The vehicle was taken to a dealer. The technician diagnosed that four fuel injectors needed to be replaced. The vehicle was repaired, however, the failure recurred on multiple occasions. The manufacturer was made aware of the failure. The failure mileage was 118,736.

- Bennington, VT, USA

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