Driver door opening sound

[Jason101]

When I open my driver door in my 2017 Tahoe LT, I get some type of mechanical noise that lasts for about 2 or 3 seconds that sounds like it's coming from under the running board towards the rear. It only happens after I unlock the vehicle and open the door. Not during any subsequent reopens. Sounds almost like an HID headlight transformer (which I don't have) becuase I hear a similar sound in my Honda Odyssey. Any thoughts?

 

[Coronado126]

Yeah I get the same thing, open door, weird clicking sound. I figure it's either the fuel pump clicking on to prime up the system before startup, or like you mentioned, the HID's kicking on.

 

[Its_Shaun12]

I don't have an answer but do share the same question. I've had my 17 LT for 3 months now and have been wondering what it might be. My first thought was the memory seats adjusting but I've confirmed that isn't what it is.

 

[Blueinterceptor]

I have that sound too. I thought it was the shocks (I have max towing)
Charging up. Leveling if you will

 

[Spilly]

The only sound I've heard like that is the rear auto leveling air suspension. I have a '16 Escalade so not sure if you Tahoe has it as well.

 

[Jason101]

I've heard the rear auto leveling air suspension every time I hook up my camper, but that only kicks in when the truck is running and that sounds like a small air compressor.

 

[sickk23]

I have that sound too. I thought it was the shocks (I have max towing)
Charging up. Leveling if you will

The compression comes on after you start it.

The sound when you open the door is the fuel pump. My BMW does it too only louder and longer.

It's a new feature for the 2017 Silverado so I'm assuming that's when the SUVs got it too since that's when they got active grill shutters.

 

[Jason101]

Thanks. Makes sense based on where I here it coming from. Wonder why the fuel pump would be running when the vehicle is not on though.

 

[swathdiver]

Thanks. Makes sense based on where I here it coming from. Wonder why the fuel pump would be running when the vehicle is not on though.

Because it figure if you open the door it will be soon so it's priming the fuel rail. There's a lot of stuff running when the car is not running. Tests are being performed all the time.

 

[Doubeleive]

you will see your mileage pop up on the lcd screen also when you open the door

 

[Rdr854]

Cars today are nothing but oversized, mobile computers.

 

[Kpwweb]

I always thought it was the HVAC outside air door opening? New cars close them after ignition off for a bit to prevent infestations. You will hear a similar noise if you sit in the car with the ignition off for awhile... The outside air door will close.

 

[Tah]

It’s the air compressor. You have a slow leak in one of your lines.

 

[zbad55]

The clicking noise you hear is indeed the fuel pump cycling on to prime the system. The door triggers a 12/14v signal to activate the fuel pump which will prime the system in about .2 seconds. Heat soak can cause fuel in the rails/lines to vaporize and cause a increase in the crank to start time. This was added in the K2XX program as a customer satisfaction issue with crank to start, and is helpful even more with the push button start. Older systems use "key on" to trigger the pump to prime the system. Hope this helps,

 

[Jason101]

Nice explanation, thanks!