Huge win for car owners! All TSBs to be made public. The Center for Auto Safety just made the NHTSA (US Government) make public the full text of all TSBs from now on. They are the same organization that has petitioned the NHTSA & filed lawsuits to protect car owners over exploding gas tanks & other major safety issues. Whenever you drive in your car, you are safer thanks in part to a lot of work over the years by this small but very effective consumer advocacy group.

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hardly worth mentioning
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
120,591 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 Chevrolet Avalanche engine problems

engine problem

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2003 Chevrolet Avalanche Owner Comments

problem #5

Oct 152014


  • 119,400 miles


It started with the airbag light, but nobody will own up to fixing it, as we moved from pa to fl. Then the brake lines went, all of them, now with the airbag issue the PCM is sending all kinds of stupid codes like the airbag issue is affecting the whole electrical system in the truck.

- Cape Coral, FL, USA

problem #4

Jul 202013

Avalanche 8-cyl

  • 101,300 miles
Engine light and reduce engine power and start loosing speed. After turned off for a few minutes work fine. This year in an hour ride have to stop at least 20 times. Computer codes stated need to change throttle body. Last week I change it and again the same problem.

- Summerfield, FL, USA

problem #3

Nov 132013

Avalanche 8-cyl

  • 125,000 miles
The contact owns a 2003 Chevrolet Avalanche 1500. The contact stated that the low coolant level warning light illuminated intermittently. The vehicle was taken to a dealer where it was diagnosed that the cylinder heads were fractured and allowing coolant to inadvertently enter the engine. As a result, the engine needed to be replaced. The manufacturer was notified of the failure. The vehicle was repaired at the owner's expense. The approximate failure mileage was 125,000 and the current mileage was 129,000. Updated 05/28/14 MA updated 06/4/2014

- Alexandria, MN, USA

problem #2

Jan 012013

Avalanche 8-cyl

  • 200,000 miles
For the last year or so my 2003 Chevy Avalanche has had an intermittent problem of throttling down when I hit about 60 mph. The error words pop up of "reduced engine power" and I have to pull over (after negotiating highway traffic to get to shoulder with no power) and turn engine off and let it sit for a few minutes before starting it. Sometimes it does it multiple times in the first hour of driving. Seems to do it more when the weather is colder than when hot.

- Azle , TX, USA

problem #1

Jul 222013

Avalanche 8-cyl

  • 57,253 miles
Rattle form the A/C belt tension-er when accelerating. Have changed multiple new tension-ers and there is still the rattle from the belt tensioner. I have found a tsb on the A/C compressor that leads to the issue.

- Columbus, GA, USA

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