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I have a 2019 Z71 Colorado. Today I noticed a high pitch sound at idle when the truck is in park and drive. There is no high pitch sound when the truck is in reverse. Any idea what this can be?
 

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Can you post an audio file of it?

Does it change with acceleration, etc? You say at idle, so can we assume it disappears when you take your foot off the brake in drive?

If you pop the hood while in park, can you isolate where the noise originates?
 

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Discussion Starter #3
Can you post an audio file of it?

Does it change with acceleration, etc? You say at idle, so can we assume it disappears when you take your foot off the brake in drive?

If you pop the hood while in park, can you isolate where the noise originates?
I'll try to upload a sound clip later. I noticed the sound isn't always there. When I start my truck in the morning I can't hear the high pitch sound. When stopped at a stop light the sound returns. When I pop the hood I can't tell where it's coming from. Also the sound disappeared as I was trying to pin point the location.
 

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According to dealer it's from a bad water pump.
Thanks for reporting back, it is always nice to get the rest of the story to add to our collective knowledge. In Star Trek speak, the Borg Collective is wiser today.

Resistance is futile.
 
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