Catalytic converter rattling sounds?

2020 GMC JIMMY
190,570 MILES • 6 CYL • 2WD • AUTOMATIC
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MARTINFLORES
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  • 1 POST
There's knocking loudly and muffler sounds loud as I'm driving and the catalytic converter sounds like something is loose inside of it.
Aug 28, 2023 at 1:06 AM
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STRAILER
  • ✓ASE Certified Mechanic
  • 54,837 POSTS
  • ASE Certified Mechanic
2020 GMC JIMMY? This happens when the catalytic converter is hot and then water gets slashed in it which breaks apart the honeycomb inside the converter. This means it will need to be replaced, here is the new catalytic converter on amazon for $135.00 I believe.

https://amzn.to/3qHariB

Please double check the model so I can give you instructions on how to replace it.
Aug 28, 2023 at 11:25 AM
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