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hardly worth mentioning
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
58,980 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 exhaust system problems

exhaust system problem

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2003 Chevrolet Avalanche Owner Comments

problem #1

Jan 152007

Avalanche 4WD 8-cyl

  • Automatic transmission
  • 58,980 miles


I have a 2003 Chevy Avalanche Z71 with 59000 miles. I noticed my vehicle being very sluggish the day before. When I left for work, I could barely get up to 50 mph, in order for me to stay at 50 mph I would have to reach 3000 RPM. After I turned down a side road, I could only get up to 20 mph at 3000 RPM. I pulled over and called for help. I took it to a Chevy dealership. They found the intake gasket was bad which caused the converters to fail and clog up the Y pipe. It's hard to believe this happened with only 59000 miles. I take great care of my Avalanche. I've read on forums where there is a lot of people that is having the same problem with the same type of truck and year. The dealership replaced the gasket, both converters, Y-pipe and the O2 sensors.

- Toledo, OH, USA

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