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Noise in 05 Crew Cab

GM Dude

By GM Dude
in Ask A GM Technician

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GM Dude Enthusiast

GM Dude

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Anybody know what might be the cause of a noise that seems to have just started in my 05 GMC crew cab. It seems that it happens for a few seconds when accelerating and it is a high pitched noise. I really don't know how to explain the noise but it kinda sounds like a high speed blower spinning up but is faint and very irritating.

 

Thanks for your help

steve summers Enthusiast

steve summers

Posted
Posted
Anybody know what might be the cause of a noise that seems to have just started in my 05 GMC crew cab.  It seems that it happens for a few seconds when accelerating and it is a high pitched noise.  I really don't know how to explain the noise but it kinda sounds like a high speed blower spinning up but is faint and very irritating.

 

Thanks for your help

 

 

 

 

I've noticed the E-fans on my 05 GMC CC are REALLY loud. Could it be the fans?

GM Dude Enthusiast

GM Dude

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Not sure but it sounds like it is coming from under the dash. Even though it sounds like its under the dash it could be coming from anywhere. I'll do some checking and thanks for the reply

GM-Tech Senior Enthusiast

GM-Tech

Posted
Posted

I'm not sure if this is what you're hearing, but there's an inherent whistle noise in the throttle body of trucks with the electrically controlled throttle.

 

This noise is slight, and only occurs for an instant during acceleration from a closed or almost closed throttle. This noise can be duplicated while driving or sitting at a stop, in neutral, park, whatever. It doesn't last for a few seconds though, only a second at most, maybe half that.

 

You'd have a real tough time hearing this under normal contions, but once you pick up on, you tend to zero in on it real easily. We've only had one customer notice or complain about this in the zillions of electronic throttle body trucks that have come through our service department, but there's one in every bunch. :ughdance:

 

There's a fix for it, but it's not a great one and again, this may not be what you're hearing. I haven't noticed it lately... maybe they fixed it in '05.

Trouttrooper Enthusiast

Trouttrooper

Posted
Posted

I've noticed my Allison has a "school bus tranny" whine when in first gear. It's pretty faint and easily drowned out by radio or moderate to heavy accleration.

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