What are the GM 6.6’s gas problems?

I’m looking at buying a Chevy Silverado, but I’ve heard there are some issues with its GM 6.6L engine. What exactly are the GM 6.6’s gas problems?

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Answer provided by
Claire Beaney
Answered on Jul 21, 2022
Doing some research before you buy is always a good idea! Here are some common GM 6.6 gas problems:
  • Knocking sound
  • Random ticking noise
  • Lifters and valve springs have failed
  • Noise from valves
  • Excessive gas use
That said, some of these problems have easy fixes if you’re comfortable working on cars. Otherwise, it may take a few trips to the mechanic to get your engine up to speed.
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