How to Identify & Sell your GM Catalytic Converters

Posted: May 26, 2022

The Team at wants to service your scrap catalytic converter needs and this week we are highlighting GM Catalytic Converters.

GM Catalytic Converters

What you need to know…

General Motors Company commonly referred to as General Motors (GM), is an American multinational corporation headquartered in Detroit that designs, manufactures, markets, and distributes vehicles and vehicle parts, and sells financial services. GM is the parent company to BuickCadillacChevrolet & GMC. 

General Motors has so many brands that it owns and operates it leaves a lot of catalytic converter information out there to be found. One of the best things that GM has done is clearly put serial numbers on about 90% of their catalytic converter units. This has allowed the scrap side to be done much easier and more accurately compared to other makes like Honda.

Many GM cars have a minimum of one catalytic converter on them but most have at least 2-4. This is done to help mitigate the emissions found in cars that are out there and also cleaner for the environment.

When looking for the serial codes on GM vehicles they are normally on one of the corners of the catalytic converter or stamped/etched on the main shield. GM is not known for many secondary shields so we suggest getting some steel wool out to look for those numbers.

There are many types of GM Catalytic Converters:

  • Bread Loafs – Large & Small
  • Pills
  • DPF’s
  • GAP AC
  • Small AC Square
  • Large & Small Flow
  • Beads


GM Cats Usually Have 2 Cats…

Many GM’s have 2 cats – a Pre-Cat and a Regular-Sized Catalytic Converter.

Identifying Serial Numbers on GM Catalytic Converters

GM does a nice job of stamping the serial numbers on their Catalytic Converters. You can find them on the body of the Catalytic Converter either in the middle, top, side, or on the outer rim. An example of this is in the photo below this GM Catalytic Converter has the serial number: 25129701

How To Find Serial Number on GM Cat

  • Use steel wool to clean the area so that you can bring out the serial number.
  • Generally, the numbers start with 126, 127, 251 & 253, and those will help to give you a better idea of their exact value of them.

Most Popular GM Catalytic Converters for Scrap

Some of the most popular car models we get asked about when pricing your GM Catalytic Converters are:

  • Buick Lesabre
  • Chevy Monte Carlo
  • GMC Yukon

Tom explains in the video how to find these serial numbers on your GM Catalytic Converter before you send them to our team for quoting.

The buying team at is waiting to help you make $$ on your Catalytic Converters.

Send your photos to receive a quote today!


We at want to thank you for your patronage and For giving us the chance to earn your business & service your Catalytic Converter.