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2021 Sierra Denali 6.2L Engine or Exhaust Chirp Noise

Pbrad074
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On 11/9/2021 at 11:13 AM, rsimons said:

Quick follow up.  I just tried the L9 mode and confirmed that it stops the noise while driving (decel).  Of course this doesn't help on cold start while in Park.  Can anyone confirm if the Pulsar LT (DFM deactivation) will help at start up?  

It won't.  It's the serpentine belt.  After a few thousand miles you'll start to notice one edge of the belt is slightly fraying.  Once that happens the chirping/squeaking will go away because the belt will be slightly slimmer and better aligned.  I'm not very comfortable with this, so I keep a spare belt and belt removal/install in my truck just in case. 

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