Strange Chirping Noise in Cab

Stonewall11 · August 1, 2015

Hey guys just checking to see if anyone else has had a problem/noise like this.

I drive an 2014 Crew Cab LTZ with roughly 10,000 miles. In case this info will help.

Now it doesn't always happen but when it does, it doesn't start until I am going roughly 30 mph. It sounds like a high chirping, or like a cricket is in the cab. It also seems like it's coming from the passenger side. Bumps don't affect this noise like the noise I have in my sunglasses holder. Only the speed does.

Anyways I love my truck and it wouldn't be a deal breaker, but if I could fix it that would be awesome.

Also thanks in advance anyone and everyone who shares their input or personal experience.

jdg24 · August 1, 2015

Does it sound like this at all?

Stonewall11 · August 1, 2015

I am currently heading out to dinner with my family and it will not let me listen on my phone. Will listen when I get home and let you know. Thanks!

20L8TSierra24 · August 1, 2015

Its 100% the flapper valve just behind the muffler on your exhaust. It chirps when your truck transition's from v4-v8.

Put a bolt and nuf through it or a hose clamp and clamp of open. OR... Have the dealer replace your exhaust.

Edited August 1, 2015 by 20Bowtie14

jdg24 · August 1, 2015

Its 100% the flapper valve just behind the muffler on your exhaust. It chirps when your truck transition's from v4-v8.

Put a bolt and nuf through it or a hose clamp and clamp of open. OR... Have the dealer replace your exhaust.

That's what I was thinking. The noise in my video is from the flapper valve

Stonewall11 · August 1, 2015

And do you hear it in the front on the passenger side as well? I'll still listen when I arrive home.

jdg24 · August 1, 2015

And do you hear it in the front on the passenger side as well? I'll still listen when I arrive home.

yip

20L8TSierra24 · August 2, 2015

Trust me, that's your issue

Stonewall11 · August 2, 2015

That sound is much more consistent than mine, and mine doesn't keep a constant chirp going in that way. I'll have to upload a clip of my trucks noise. Although it may just sound different on video. But I'll have to do some testing and comparison as that could be it.

FL335i · August 2, 2015

flapper valve in the exhaust. I did a AFE cat-back. Best thing this truck has ever seen. No more chirping either.

Trza · August 3, 2015

I'd put money on the Flapper Valve as well.

I took my truck in over the winter complaining of the noise. The shop foreman at the time went on a ride along and couldn't figure it out and told me to book an appointment so that they can do a thorough assessment. I waited till after winter, in which during this time, I scoured the forums and came across this Flapper Valve issue. As well, the chirp in that time got worse and would actually chirp every time I stepped on the throttle...it was quite embarrassing.

I recently just took it in for an oil change and told them that I'm positive that my flapper valve is the reason for the noise. Later that day, they call me to tell me that it wasn't the flapper valve and that it was my rear leaf springs that needed to be lubed up as per some bulletin...I took their word for it, drove it home...fast forward a couple days and the chirping was back! I made another appointment, took the (new) shop foreman for a spin and he agreed that it was in fact the flapper valve. They replaced my exhaust with part # 23219691, which is the exhaust, resonator and tail pipe ( work order: 4051980 exhaust muffler with resonator, exhaust and tail pipe replacement)...he even warned me that it might come back as he's had similar experiences with other owners. ***Sigh***

Prior to installation, I tried making a deal with him to carry over the cost of the new exhaust and put it towards the GM Borla one. He said he couldn't do it...now that this new exhaust that they put on is starting to chirp, I'm definitely going to strong arm them into something.

Coles Notes: It's your Flapper Valve.

Fishingbear · August 3, 2015

It's your flapper valve in the exhaust system and is related to the Active Fuel Management feature. It happens every time your engine switches from V4 to V8. I complained about this in my 2015 SLT 5.3 Sierra months ago and was told that there is no fix and to turn up the radio so that I don't hear it.

It's very frustrating and unacceptable. I've had passengers in my truck think that my transmission was on the fritz. I complained again when I had my oil changed three weeks ago and my service adviser put it on the service ticket but my receipt when I picked up my truck said that it was "operating as designed."

Waiting for GM to come up with a fix.... this did not happen in my 2007 Sierra with Active Fuel Management.

Stonewall11 · August 3, 2015

I'm going to set up a service appointment and see if I can get that checked out. Seems as though that's the problem as everyone knows what it is just from explanation. I'll let you guys know how I make out.