Rattling sound from engine - Cadillac Society

This topic has 5 replies, 6 voices, and was last updated 1 year, 8 months ago by slick60612.

Viewing 6 posts - 1 through 6 (of 6 total)

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November 17, 2020 at 9:20 am #77911

Nicholle
Participant

I am getting consistent rattling noise from the engine when re-accelerating. Usually 1RPM. Any fix for this?

January 2, 2021 at 12:56 am #78787

Vinces
Participant

Hello. Any updates on your question?
I have a rattling noise as well when accelerating from a stop. Sounds like it’s coming from the catalytic converter.
Brand new xt5 2020

January 18, 2021 at 8:39 am #79104

Stardom1
Participant

2020 CT4 and CT5 #PIP5760 Flutter type noise heard when vehicle is operating in AFM
We have a CT 5 and ours makes a noise we have a paper from the dealership that says GM is aware of the noise and working toward a repair!
We are very unhappy with this on our new Cadillac

January 21, 2021 at 9:07 pm #79184

jsinga
Participant

So, my take LSY engine goes into AFM (2 cyl mode) at low rpms below 1500 rpms. Almost sounds like loose rod bearing sound.
Anyway, Try changing the drive mode. I only discovered this possible fix on the way home the other day.
Use the switch on the console. Menu from the display is different. Switch it to sport mode.
You might have to switch mode each time the car is started; like switching off AutoStop.
I’m not in the car all the time so I don’t see it often.
The REAL fix is for GM to keep AFM off below about 1500rpm
JS

May 24, 2022 at 9:43 am #90280

mullenrm
Participant

Thanks for this info. I will try this temporary fix. I hope a permanent solution is in the works.
RM

March 15, 2023 at 6:09 pm #95944

slick60612
Participant

I have a 2020 CT4 and I am also hearing the rattling noise when reaccelerating. I have taken it to the Cadillac service center, but they have no idea what it could be. Hoping for an update.
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