fairly significant
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
12,200 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 1500 drivetrain problems

drivetrain problem

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2003 GMC Sierra 1500 Owner Comments

problem #4

Dec 112014

Sierra 1500

  • 44,300 miles


While having my vehicle check over for the winter, the mechanic inform me that the front brake lines are very rusty as well as the fuel lines and the cooling lines going to the transmission. This situation is very disturbing since I have very low mileage. The tubing used for the brake as well as the fuel lines should be able to withstand rusting for the life of the vehicle. If the material used by GM was not up to specification as far as corrosion protection either compensation to repair it is in order a recall should be made.

- Oswego, IL, USA

problem #3

Jun 092011

Sierra 1500

  • miles
My 2003 GMC Sierra 1500 sle has corroded brake, transmission and fuel lines. A certified mechanic stated that they all need replaced or breakage and leakage will occur without warning causing break, transmission or fuel delivery or fire damages. Please help with this problem asap. 00.

- Huber Heights, OH, USA

problem #2

Aug 192004

Sierra 1500

  • 4,500 miles
Starting at <5K miles the vehicle power train clunked when shifting from 2nd to 3rd gear. Now at 70K miles it clunks when shifting between all gears except final drive. The dealership replaced the output shaft on the tranny, then the U-joints, and modified the electrical shift patern. It still clunks. Power steering intermittently locks up at slow speed turns, especially when braking. Light bulbs burn out almost every three months. Had to pay ($486) for replacing the intake manifold gasket when vehicle had little over 40K miles. Brakes fade and the pedal almost goes to the floor, again intermittent. I have almost caused several accidents due to the steering and brake issues. GMC issued a letter stating "this is a normal occurance and will not cause damage." Well, it's getting worse in sound and clunking harder during shifting.

- Eden, MD, USA

problem #1

Mar 032008

Sierra 1500 8-cyl

  • miles
2003 GMC Sierra with several problems. Consumer states that the transmission failed. Passenger side window motor broke, speedometer failed due to stepper motor failure, truck is on the third set of front brake rotors, and upper support column bearings, and more problems. The consumer stated the dealer refused to replace the upper support bearing, but replaced the intermediate shaft instead. The rear planatery forward clutch was burnt, which caused the transmission to fail.

- Gibsonia, PA, USA

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