Acceleration Buzzing Sound (CT4-V Blackwing)

[Seth]

Okay. I first noticed this sound in my car about six months ago. Very annoying but didn't want to waste my time with the dealership. I've just been living with it. Now I found someone on FB complaining of the same noise. I would describe it as an "electronic buzzing" under acceleration, like fluorescent lights - also kind of sounds like crickets. It happens under acceleration only. Doesn't happen if you rev engine in neutral. Mine is 6MT and his is 10AT. First video is mine, second is his. Cadillac tried to tell him the issue was the fuel pump, which they replaced and it made no difference.

Any thoughts?

 

[Seth]

Hello all - this sound is driving me crazy. I hate it. It makes me not enjoy driving the car. Can I get some confirmation that this is not normal? A couple months back they first told me it was something to do with the amplifier (?) so they replaced the amp and it made no difference. Then they switched their story to "oh it's the fuel pump it's normal" ... it does not sound normal to me. I hate it. I have COVID and I'm grumpy

 

[NewCaddy]

It’s not a normal sound effect.,dont’t hear it with my 6MT.
Did the FB person share w/you any feedback from their dealership?

 

[Seth]

It’s not a normal sound effect.,dont’t hear it with my 6MT.
Did the FB person share w/you any feedback from their dealership?

Thank you for the response.

Unfortunately his dealership couldn’t fix it and he ended up getting rid of the car, I don’t know the exact story - sounds like the dealership bought it back.

 

[99sport]

Is it all the time or intermittent? (I'm not sure from the videos which noise you are referring to)

 

[Aaron4BW]

Sounds like it gets faster as the rpms rise, so it can be the hpfp. It is on the driver side against the cowl, but I have a 6mt as well & have never heard that noise. Maybe have a friend rev the engine up slowly as you are outside with the hood popped & take a listen.

 

[Super Saloon]

I can’t listen to the sound right now but have you tried driving with you key in your pocket v the designated key area? The only buzzing sound I noticed was also under acceleration and it was coming from the key ring when the key was in the holder. I took the ring off the key and the problem is solved.

 

[Seth]

Is it all the time or intermittent? (I'm not sure from the videos which noise you are referring to)

It's intermittent and more prominent with throttle input

Sounds like it gets faster as the rpms rise, so it can be the hpfp. It is on the driver side against the cowl, but I have a 6mt as well & have never heard that noise. Maybe have a friend rev the engine up slowly as you are outside with the hood popped & take a listen.

I will try this! Thank you

I can’t listen to the sound right now but have you tried driving with you key in your pocket v the designated key area? The only buzzing sound I noticed was also under acceleration and it was coming from the key ring when the key was in the holder. I took the ring off the key and the problem is solved.

Always drive with key in pocket. Thank you though!

 

[DCV]

That’s a weird noise. On one of my 350’s, the rear cylinder block plate would make a weird sound right at 4K rpm or so. That’s the plate that seals off the rear of the engine to the bell housing. I had to have it replaced.

 

[Seth]

Bumping to see if ANYONE else has experienced this? It's been going on for about 18 months now. The dealership has replaced the amp, replaced the fuel pump, and replaced the fuel lines. It's back at the dealership now and they're brining in a field engineer to look at it. It's so annoying.

 

[ngoni]

I see they've already replaced the amp, but you might try disconnecting the ANC mics to rule out that system as the culprit.

 

[Seth]

I see they've already replaced the amp, but you might try disconnecting the ANC mics to rule out that system as the culprit.

Tried that, at least to my knowledge. I took a couple of the fuses out and confirmed with dealership those were correct fuses to the ANC system - it didn't do anything unfortunately. Another mechanic I brought it to also thought that might be the issue.

 

[CNYBlackwing]

Hey there,
I have a 2022 CT4Blackwing that makes the exact same noise. It seems intermittent but is definitely there. I bought mine with 20k miles and when I got it home and really started driving it, I started to slowly notice that noise that you described as a sort of electronic buzzing or ticking. When I really started looking the car over, around that driver side area, I noticed that it looked like someone had been messing with the top of the driver side – above the steering wheel. There was one part of the trim that was not all The way seated. Guessing they were looking for the source of this noise but never found it. Going to be taking it to another dealer next month and we'll see what they have to say about it, now that I have the info from here, that it is NOT the amp or fuel pump...

 

[Seth]

Hey there,
I have a 2022 CT4Blackwing that makes the exact same noise. It seems intermittent but is definitely there. I bought mine with 20k miles and when I got it home and really started driving it, I started to slowly notice that noise that you described as a sort of electronic buzzing or ticking. When I really started looking the car over, around that driver side area, I noticed that it looked like someone had been messing with the top of the driver side – above the steering wheel. There was one part of the trim that was not all The way seated. Guessing they were looking for the source of this noise but never found it. Going to be taking it to another dealer next month and we'll see what they have to say about it, now that I have the info from here, that it is NOT the amp or fuel pump...

Good luck my friend and please keep me posted. I’m at an impasse with my dealership. They’re now trying to say it’s a normal characteristic of the engine. However they already had me test drive a different one to try and confirm the issue and we all agreed the other one didn’t make the noise!!! The dealership says the next step is to open a case with GM. What a waste of time.

 

[jadis192]

I listened to all the videos and can't hear anything abnormal

 

[Seth]

I listened to all the videos and can't hear anything abnormal

Put headphones in and listen to most recent one. Think crickets or fluorescent bulb. Once you hear it, it becomes very annoying. Lol.

 

[Seth]

Hey guys, just looking for a reality check here. This sound is driving me crazy. Cadillac now trying to tell me it's "a normal characteristic of the LF4 engine"

Do y'all hear abnormal noise in these vids?

 

[piranha971]

No, that's not normal.

 

[CNYBlackwing]

Yeah, not normal. Mine was doing the same thing before it got cold outside, but for whatever reason, it seems to have subsided. A buzzing noise coming from the cabin of an almost new Cadillac shouldn't be considered normal or ok. I would think if they all made that noise, that nobody would buy one after test driving. Here's to hoping they get it sorted instead of passing the buck!

 

[DCV]

Not normal. Sounds like a baseball card hitting the spokes of a bicycle. Loose heat shield or something. Does it stay constant regardless of the speed or rpm? I’d put the car on stands or a lift, then start poking around with the engine running.