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Noise in cabin or am I going crazy?

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Great find!!!!

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15 hours ago, Bailey’s 6.2 said:

Ok the whistle is gone !!!

They have resolved the issue with part #84626475 Hose 3.120 Y 

Its a vent hose on the gas tank that was to small. It collapses upon itself and whistled. 

Thanks for the info. You've got a good  service dept at your dealer. I'm hoping GM puts out a service bulletin on this. Many dealers won't do a thing without one.

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This is going to sound funny but it is the best way to describe the noise I have. If you have ever watched Rudolph the Red Nosed Reindeer you will know that when his nose glows it makes a high pitched sound. The noise in my truck is like this but down a few decibels. I have isolated it in the crack between the drivers side rear door and the bed. That is where the fuel tank is and the fuel filler hoses are nest that area. I can change the pitch by grabbing the hoses and moving them. 

To duplicate it without driving, take the traction control off, put your truck in gear and ease on the gas, it should start making the noise around 1500 RPM's. It will start out low and get louder. I really feel it is a fuel pressure line problem.

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On 1/8/2019 at 1:42 PM, Bailey’s 6.2 said:

Ok the whistle is gone !!!

They have resolved the issue with part #84626475 Hose 3.120 Y 

Its a vent hose on the gas tank that was to small. It collapses upon itself and whistled. 

 

26 minutes ago, Rduatctt said:

This is going to sound funny but it is the best way to describe the noise I have. If you have ever watched Rudolph the Red Nosed Reindeer you will know that when his nose glows it makes a high pitched sound. The noise in my truck is like this but down a few decibels. I have isolated it in the crack between the drivers side rear door and the bed. That is where the fuel tank is and the fuel filler hoses are nest that area. I can change the pitch by grabbing the hoses and moving them. 

To duplicate it without driving, take the traction control off, put your truck in gear and ease on the gas, it should start making the noise around 1500 RPM's. It will start out low and get louder. I really feel it is a fuel pressure line problem.

Sound familiar?

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Well now...

 

Quote

 

#19-NA-005: Hoot or Whistle Noise Heard at Highway Speeds - (Jan 10, 2019)

 

Silverado 1500 (New Model)

Sierra 1500 (New Model)

 

L84/L87 engines

 

Some customers may comment that a hoot or whistle noise can be heard while driving at highway speeds around 70-74 MPH (113–119 km/h).

Some technicians may find this noise is emitted during the canister purge cycle.

 

This condition may be caused by the inner surface of the vent line attached at the fill pipe, which has a convolute surface and may allow a whistle noise to occur during purge flow at higher flow rates.

 

If the noise was validated to be coming from the vent, replace the Fuel Tank Filler Pipe.

    • The fill neck has a revised vent line attached that has a smooth interior surface designed to eliminate vent whistle.

 

    •  

 

Edited by newdude
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Thank you!    Is the  # 19-NA-005 A service bulletin number? How did you find this info?

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I also am experiencing a high pitch noise almost a whistling sound...it is not there when I am below 20 mph but shows up afterwards, I can eliminate it by turning up the bose. I put down the windows and it almost sounds like it is a wind noise coming from the drivers side mirror assembly. I may try to tape a few openings to see if it gets reduced....I just read the service info from above...will ask the dealer at 1st visit. Thanks for the info...

Edited by vegasbob
new info

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