Whining when engine revs

[Panther69]

EDIT: Whining almost like mini jet engine. Does constantly but very audible when accelerating and engine shifting through gears. When in park and revving engine whining increases so not specific to just drive and shifting through gears.

2021 Mojave. Gas. Automatic. 31000 miles. Not sure how long it’s been going on. My daughter has been driving it and you can’t hear it with windows up and radio on. No modifications to vehicle.
Searched site but didn’t find much. Maybe not searching with correct key words. Any ideas??

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[Mr._Bill]

Gas or Diesel engine?
How old is the truck?
New problem, or always does it?

 

[Panther69]

2021 Mojave. Gas. 31000 miles. Not sure how long it’s been going on. My daughter has been driving it and you can’t hear it with windows up and radio on. No modifications to vehicle.

 

[Maximus Gladius]

Is it an auto and you hear the whine through 1st and 2nd gear with a health bit of throttle?

 

[Panther69]

Edited my original post with more specifics. Thanks guys. Going to try and drop off today.

 

[Maximus Gladius]

Go to 5:00 and 6:38 and you will hear the whine in this guy’s transmission. This video is him listening to his new exhaust but never mind that.
If this is the same whine, I have it too on my 2021 JTR through first and second and I had it in my second and now my third transmission. FCA says it’s normal.

The tech diagnosing the whine in my second auto transmission informed FCA it was planetary gears so that transmission was swapped out at only 500kms.

The second transmission did the same thing and whine was immediately noticed. I asked if they actually did the swap out or what?? The service manager said it’s a new transmission but FCA is saying the whine is normal. I asked how did they approve the change out of the transmission if they deemed it normal? He said the dealership changed it out but it’s very possible FCA engineers will find no fault with it and cost will be on the dealership.

I only know that the service manager moved on shortly after. I’m at 30k kms on my third tranny and even though I have that whine, oil analysis reports are stellar.

 

[Panther69]

Go to 5:00 and 6:38 and you will hear the whine in this guy’s transmission. This video is him listening to his new exhaust but never mind that.
If this is the same whine, I have it too on my 2021 JTR through first and second and I had it in my second and now my third transmission. FCA says it’s normal.

The tech diagnosing the whine in my second auto transmission informed FCA it was planetary gears so that transmission was swapped out at only 500kms.

The second transmission did the same thing and whine was immediately noticed. I asked if they actually did the swap out or what?? The service manager said it’s a new transmission but FCA is saying the whine is normal. I asked how did they approve the change out of the transmission if they deemed it normal? He said the dealership changed it out but it’s very possible FCA engineers will find no fault with it and cost will be on the dealership.

I only know that the service manager moved on shortly after. I’m at 30k kms on my third tranny and even though I have that whine, oil analysis reports are stellar.

I can’t see how it’s “normal” when it didn’t do it for at least 20,000 miles. My wife had a Mojave too with 58k miles and no noise like this. I sure hope they don’t try to say nothing can be done.

 

[ShadowsPapa]

Some whine in automatics IS normal. If you can't hear it with the windows up, ignore it, IMO.
I can sometimes hear a whine coming from our vehicles when my wife drives away in them...... and it's louder on some than others.
There's a lot of whirring planets in these things especially in the lower gears where there's a lot of reduction. The planets are spun at a pretty good rpm and the gears aren't exactly whisper quiet.
Reverse is normally a pretty loud whine. Even on the test stand in college when checking freshly built automatics, you could hear the whine in the lower gears.

If that concerned - get a fluid sample to sent to a place like Blackstone.

 

[Maximus Gladius]

My quick read up on gear whine is they are either wearing out or tight. An oil analysis will tell you if it’s unusual wear.

 

[ShadowsPapa]

My quick read up on gear whine is they are either wearing out or tight. An oil analysis will tell you if it’s unusual wear.

IMO, it's like "clunk".
Sometimes people unfamiliar with a sound may hear if for the first time, or simply pay attention to it for the first time and it's a problem when it's not.
Sometimes something has changed and there's a problem.

But to jump and say "whine! You have a bad transmission!" isn't right either, IMO.

For me to say a whine is a problem - I'd want to HEAR IT myself - I won't say it is.
But the internet is more a bandwagon than a true diagnostic tool.

What gets reported on the internet is either NOT normal sounds, or something thinking it's not normal.
So, be careful of "what the internet says".
I've rebuilt more automatic transmissions over the years than I can count - and I still won't diagnose sounds over the internet. Only shifting issues because those can be nailed down with definite descriptions. What's loud to me may be nothing to someone else.

It may be bad, or a pro may listen and say it's fine.

If there's a concern, take it to a pro. No one on the web can say if it's a real problem or not.
Get a fluid sample, have it tested by a lab. If the fluid is normal - then there's no problem.
If there's any abnormal wear at all - even just beginning - they'll see it in the fluid.

Best advice I can give in any case - get it to a DEALER, make them record on paper and in their systems that you complained of a whine and are very concerned. GET IT IN WRITING, make them show you they have recorded your concerns. Once reported, even if it fails just out of warranty, it's got to be covered because you complained of the issue while it was still under warranty.
If you visit the dealer later for something, mention it again, and again make them make a record of your complaint.

 

[Panther69]

Thanks all for the input. Was just checking to see if it was a common problem in these trucks which there isn’t one specific issue that seems to be coming up. I appreciate all responses and will report back if there is an actual issue and if so what it is.

 

[EOS311]

Thanks all for the input. Was just checking to see if it was a common problem in these trucks which there isn’t one specific issue that seems to be coming up. I appreciate all responses and will report back if there is an actual issue and if so what it is.

Mine was doing this and driving me crazy. I felt like an idiot when I realized it was my slush mats. The front passenger side drain plug was pulled out of the mat. Reinstalled it and the noise was gone. Hopefully this is your issue as well.

 

[Panther69]

So got the Jeep back yesterday. Multiple idler pulleys were replaced, new alternator and both batteries replaced. Truck is back to normal again.

 

[ShadowsPapa]

So got the Jeep back yesterday. Multiple idler pulleys were replaced, new alternator and both batteries replaced. Truck is back to normal again.

Just throwing this out there - as it's not likely on these without kicking an error related to some other parts of the electric system, but I used to, before hearing loss got so far along, be able to listen to an alternator under load and tell you if a diode or stator winding was bad by the "whine" coming from the alternator.
I still can to some extent tell when I load up al alternator on my test bench if there's a problem by the sound.

But that generally gives an ac pattern to the output or at least not a smooth, pretty much ripple-free pattern and some modern electronics will panic over it.

In any case - it makes me wonder if there wasn't something going on electrically if they ended up replacing all of that. (or covering their bases instead of just swapping a part, putting the belt on, trying it, swapping another, putting the belt on, trying it..........

 

[BearFootSam]

Some whine in automatics IS normal. If you can't hear it with the windows up, ignore it, IMO.
I can sometimes hear a whine coming from our vehicles when my wife drives away in them...... and it's louder on some than others.
There's a lot of whirring planets in these things especially in the lower gears where there's a lot of reduction. The planets are spun at a pretty good rpm and the gears aren't exactly whisper quiet.
Reverse is normally a pretty loud whine. Even on the test stand in college when checking freshly built automatics, you could hear the whine in the lower gears.

If that concerned - get a fluid sample to sent to a place like Blackstone.

22' JTR w/ 18k, I have a mile and a half drive out to the road where I'm in tight trees only going 10-15mph. In the mornings or when it's cold I can hear all sorts of noise going slow. It makes sense, the automatic is a big ol' box of gears all spinning in cold thick oil, the differentials and engine likewise. The engine also runs differently during warmup to speed that along and all together it's a bit noisy but nothing concerning. With all those parts getting limbered up you are bound to have some commotion considering the truck is high off the ground and has little to no underbody sound deadening.

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