Scratching noise
Le Mans Master
Joined: Dec 2017
Posts: 5,590
Likes: 3,317
From: Virginia
2021 C5 of the Year Finalist - Modified
St. Jude Donor '21-'22
Welcome to the forum. Do you have a manual or automatic? You're not giving us much info to go on. When are you hearing this sound? Can you post a video of what you're hearing?
Thread Starter
4th Gear
Joined: Jul 2022
Posts: 4
Likes: 0
From: Inglewood California
Le Mans Master
Joined: Dec 2017
Posts: 5,590
Likes: 3,317
From: Virginia
2021 C5 of the Year Finalist - Modified
St. Jude Donor '21-'22
It almost sounds like you might have something rattling around inside your muffler or catalytic converter. Based on the video it seems like you have the car in neutral (or park if automatic), and the car is at idle. I'm reasonably certain that this is not a transmission issue, Although, I suppose it is possible that it could be coming from the rear diff. Other than the rattle, do you notice any issues while driving the car? If it is the diff making that noise, I would think you would notice some serious issues when trying to drive it.
If you are not having any issues other than the rattle sound, my guess is that a piece broke off the inside of you cat, and is rattling around in your exhaust.
If you are not having any issues other than the rattle sound, my guess is that a piece broke off the inside of you cat, and is rattling around in your exhaust.
Thread Starter
4th Gear
Joined: Jul 2022
Posts: 4
Likes: 0
From: Inglewood California
[QUOTE=MWWarlord;1605467337]It almost sounds like you might have something rattling around inside your muffler or catalytic converter. Based on the video it seems like you have the car in neutral (or park if automatic), and the car is at idle. I'm reasonably certain that this is not a transmission issue, Although, I suppose it is possible that it could be coming from the rear diff. Other than the rattle, do you notice any issues while driving the car? If it is the diff making that noise, I would think you would notice some serious issues when trying to drive it.
If you are not having any issues other than the rattle sound, my guess is that a piece broke off the inside of you cat, and is rattling around in your exhaust.[/QUOTE Well I do get the P1 870 code
If you are not having any issues other than the rattle sound, my guess is that a piece broke off the inside of you cat, and is rattling around in your exhaust.[/QUOTE Well I do get the P1 870 code
Le Mans Master
Joined: Dec 2017
Posts: 5,590
Likes: 3,317
From: Virginia
2021 C5 of the Year Finalist - Modified
St. Jude Donor '21-'22
Oh, that is a bit worrisome then. That is a transmission slippage code. I believe it is often related to the control valve body. You may be able to fix this issue with a TCC valve rebuild kit. It's cheaper than rebuilding the entire transmission. With that said, this usually results in a rough 1-2 shift, not a rattling sound. It is tricky to try and diagnose an issue like this online though.
Race Director
Joined: Oct 2004
Posts: 12,864
Likes: 4,667
Sorry. Had to say it. Maybe you've picked up a small branch, and it has lodged into the rear end somehow? IDK. If youre getting a trans slippage code, I'd give it a fluid and filter change. Check the fluid color while you're in there. If fluid doesn't smell burned, is a nice cherry red color, and you're mechanically inclined, you may want to CAREFULLY drop the valve body, and see if any check ***** are being held open by some sort of debris. Could be numerous things. Some of the old 4L60E valvebodies used plastic *****, which are inferior. If you want, just drop the valvebody, and carefully take it to a good trans shop in your area. They'll know what they're looking at, if you don't. Best of luck to you ...
Last edited by grinder11; Jul 28, 2022 at 06:50 PM.
Thread Starter
4th Gear
Joined: Jul 2022
Posts: 4
Likes: 0
From: Inglewood California
I really appreciate you guys taking the time to help me out On trying to figure out the problem with my car so I recently bought it less than a month ago and the dealer I bought it from they’re telling me that their mechanic is gone and won’t be back till the week but my 30 days will be up in a week and I’m not trying to keep the car if this person cannot fix my car within the week. Can I be the driveshaft
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Melting Slicks
Joined: Dec 2004
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From: Sleepy Hollow- NJ
I really appreciate you guys taking the time to help me out On trying to figure out the problem with my car so I recently bought it less than a month ago and the dealer I bought it from they’re telling me that their mechanic is gone and won’t be back till the week but my 30 days will be up in a week and I’m not trying to keep the car if this person cannot fix my car within the week. Can I be the driveshaft
If you bought the car from a dealer with a 30 day warranty and now they are telling you "the machinic is out for a week...which will put you beyond the expiration of your 30 days"?!!!
I would sternly encourage they grant an extension IN WRITING from their Finance or Service Manager or better yet I'd bring that potential money pit back. Period end of story.
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