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Thanks Rob, I'll let you know if I take it to the dealer for this situation. But as others have stated, it's so random when it happens it will probably be difficult to replicate when needed for diagnosis. Time will tell though.
Hi 1st Dodge 2019 F8 GT, Thank you for following up with us. Please know that our team would be more than happy to provide an additional layer of assistance if you do end up connecting with your dealer. What we can do is escalate a case on your behalf so that one of our Case Specialists could work alongside your dealer to find a potential solution to the concerns you’re currently experiencing. Feel free to follow up with us via private message if this would be of interest.
Rob
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I bought a new 2019 SXT two weeks ago. About 50% of the time, it makes a clunk in the engine when starting. While it was in the shop getting stripes installed, I drove another brand new 2019 SXT as a loaner and it made the same clunk about 50% of the time when starting. Incidentally, it does start just fine. I just worry that this noise is symptomatic of an even bigger problem that's gonna bite me in the butt in the future. Anyone else having this problem? It's not the Hemi tick because it doesn't have a Hemi. :)
I’m really happy to find this thread.

I have a 2019 Charger SXT (basically same a Challenger) with an issue very similar to the one I this thread. I bought it new last April, and since my first weekend of ownership, there has a loud “thump” from underneath the car about every 5-10 starts. It is super intermittent, and I cannnot discern a pattern. It definitely is not coming from the front. Imaging someone underneath the car or in the trunk hitting the structure with a big rubber hammer - one big, solitary THUMP!

It may go a week without doing it, or it may do it three times in one day. One thing it has never done is thump first thing in the morning while cold, but it will do it on a cold start in the afternoon. It is more likely to happen, I think, when the car is warm after having been run but not exclusively. The first time it happened, I thought someone next to me had slammed their door really hard.

My thought was the exhaust was hitting the bottom of the car. I took to my dealer twice and was told there are no interferences. I was able to get it to do it once in the presence of a service advisor. I left it over a weekend, and he said his techs were able to duplicate it, and it was coming from the stereo because of a voltage spike. It really did not sound like this to me, but my car does have the premium Alpine stereo, and frequently it does sound like it is coming from the subwoofer area. I was told there was a upcoming software upgrade that would fix the problem.

Just last Thursday, my dealer installed a software update, and it has made no difference whatsoever.

Oh, well, I’m not letting this drop. I really believe the dealer does not know what to do, because they have no guidance from FCA. I spoke to two other Dodge dealers in an adjoining state, and they had never heard of this problem, either. I’m not sure FCA is on this problem, but I have opened a case. My dealer says they have never heard of this problem before, but the existence of this thread shows we are not alone in this.

If I get any kind of path forward, I will post here.

We will talk about the whine in my rear differential at another time.
 

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sound like a blend door snapping closed??????????
 

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My noise definitely does not sound like a blend door. Mine comes mostly from the rear of the car, although at times, it has felt like it comes from beneath the passenger floor - sometimes but not typically. It is quite loud and can actually be felt in the structure a little bit. I thought about a blend door once. I do not think they have another mass to make this THUMP, and they are not in the right place.

I have also thought about the backfire thing. I do not know if the noise can be heard from outside the car. I frequently use the remote start to hear how the car sounds from outside starting up. It always sounds perfectly normal using the remote start. Can’t hear anything unusual outside at all.

I’ve been putting up with issue for about a year now and am quite tired if it. Talk about making a brand new car feel like a piece of junk!
 

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Back in 2013 they did have a TSB for an issue where the amp would turn on and off resulting in a subwoofer thump. This happened after the car was turned off, and might do it a couple of times, or until the car was started again. So while it certainly wouldn't be the same issue, it's possible you could have a subwoofer thump, and would be expected to happen on start or power off

2013 bulletin for reference

2019 radio enhancement TSB

A Guy
 

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Back in 2013 they did have a TSB for an issue where the amp would turn on and off resulting in a subwoofer thump. This happened after the car was turned off, and might do it a couple of times, or until the car was started again. So while it certainly wouldn't be the same issue, it's possible you could have a subwoofer thump, and would be expected to happen on start or power off

2013 bulletin for reference

2019 radio enhancement TSB

A Guy
That is some interesting info. I’m sure the ”speaker pop noise when using Bluetooth device” symptom is what my dealer thought the 2019 update would fix. When he discussed this with me last summer, it really did not sound like my problem, because it just does not sound to me like the thump is coming from the speakers in the cabin. It may be, but I do not think so. From the subwoofer? Possible I guess.

It is interesting the 2013 bulletin addressed a software update in the amplifier. I guess I did not realize amplifiers had software, but of course everything these days has firmware in it. I should have known. I can see a case where the amp could be causing his thump. Maybe some 2019 cars need a software fix.

I‘m going to have to take my car in soon to have the rear differential replaced. (Yay, Chrysler! Another not-uncommon problem, according to some of these boards). Armed with these bulletins, if my dealer does not have an amplifier reflash available, I’m going to press him for an amp replacement. Maybe I’ll luck up and get one without faulty hardware or firmware. This is a stab in the dark, but somebody has to figure this issue out.

Thanks.
 

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That is some interesting info. I’m sure the ”speaker pop noise when using Bluetooth device” symptom is what my dealer thought the 2019 update would fix. When he discussed this with me last summer, it really did not sound like my problem, because it just does not sound to me like the thump is coming from the speakers in the cabin. It may be, but I do not think so. From the subwoofer? Possible I guess.

It is interesting the 2013 bulletin addressed a software update in the amplifier. I guess I did not realize amplifiers had software, but of course everything these days has firmware in it. I should have known. I can see a case where the amp could be causing his thump. Maybe some 2019 cars need a software fix.

I‘m going to have to take my car in soon to have the rear differential replaced. (Yay, Chrysler! Another not-uncommon problem, according to some of these boards). Armed with these bulletins, if my dealer does not have an amplifier reflash available, I’m going to press him for an amp replacement. Maybe I’ll luck up and get one without faulty hardware or firmware. This is a stab in the dark, but somebody has to figure this issue out.

Thanks.
I feel your pain.......I've been in, under, around, my GT and can't find the problem.....I'm going to try a different Dealership tomorrow and will update the post if anything
positive comes of it.....by the way I noticed if the Temps are above 50 degrees I don't hear it....maybe a coincidence.
 

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Just throwing it out there could it be the AC clutch kicking in just after start up? I know for example on smaller 4 cylinders like on my Subi if I have the climate control set to auto at start up or if I had shut off the engine previously with the AC or front windshield defroster in the on position about 5 to 10 seconds after I start up I can clearly hear the clunk of the AC clutch kicking in. It almost sounds like a loud belt snap or clunk as the AC compressor turn on and they do use a bunch of torque. Just a thought.
Might be worth turning off all accessories including climate control and making sure the auto climate control on start up option is disabled, if you have this option, and then trying to start up.
 

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2019 SXT, same noise, even made a post about it, sounds to me like a belt catching on cold start
I feel your pain.......I've been in, under, around, my GT and can't find the problem.....I'm going to try a different Dealership tomorrow and will update the post if anything
positive comes of it.....by the way I noticed if the Temps are above 50 degrees I don't hear it....maybe a coincidence.
Do you guys also have a factory subwoofer?

I have a 2018 GT and have never heard such a noise - but I don't have a factory subwoofer...
 

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Yes. My car is a 2019 SXT Plus (V6, of course). It has the 8.4” display and the upgraded Alpine stereo with the factory mounted subwoofer in the right rear corner of the trunk.
I would be of use to hear from others who have this noise and see if they have a similar setup.

One thing for sure, it does not mater if the stereo is turned on or off when starting the car. I have intentionally started it with the stereo off, and will still do it. Typically, the stereo is on, though, and that is my car usually gets started.
 

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Do you guys also have a factory subwoofer?

I have a 2018 GT and have never heard such a noise - but I don't have a factory subwoofer...
How did this turn into an audio discussion lol I am pretty darn sure the noise is coming from the engine bay on car start
 

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For you, lol...if it happens enough, I'm sure it's relatively easy to disconnect the subwoofer for a while to confirm...

A Guy
 

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Hi 1st Dodge 2019 F8 GT, Sorry to hear you are experiencing this concern, we certainly understand why this would be concerning. If you end up addressing this with your local Dodge dealer, please let us know via PM. We'd be more than happy to provide you with an additional layer of assistance for that process.
Rob
DodgeCares
[/QU
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Yes. My car is a 2019 SXT Plus (V6, of course). It has the 8.4” display and the upgraded Alpine stereo with the factory mounted subwoofer in the right rear corner of the trunk.
I would be of use to hear from others who have this noise and see if they have a similar setup.

One thing for sure, it does not mater if the stereo is turned on or off when starting the car. I have intentionally started it with the stereo off, and will still do it. Typically, the stereo is on, though, and that is my car usually gets started.
I pulled the Amplifier and Radio fuse's and still got the thump.
 

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yep that is a good suggestion,
Just throwing it out there could it be the AC clutch kicking in just after start up? I know for example on smaller 4 cylinders like on my Subi if I have the climate control set to auto at start up or if I had shut off the engine previously with the AC or front windshield defroster in the on position about 5 to 10 seconds after I start up I can clearly hear the clunk of the AC clutch kicking in. It almost sounds like a loud belt snap or clunk as the AC compressor turn on and they do use a bunch of torque. Just a thought.
Might be worth turning off all accessories including climate control and making sure the auto climate control on start up option is disabled, if you have this option, and then trying to start up.
My Dodge Ram CTD has a AC compressor that will cluck sometimes on startup. ( start of the the compressor)
I never leave AC set 'on' to start with engine startup. Sometimes when I turn the AC on, its soft on start, and other times quite harsh, like what was previously described as a rubber mallet thump on the truck. But when it cycles during use, its quiet. weird.

Make a effort to turn all the environmental controls to 'OFF' before you shutdown the engine. Do this until you hear the 'thump' again on startup to eliminate the AC compressor. If you hear it again well its not the AC compressor. If you don't hear it for a week or two switch you AC controls back to automatic or leave them set to on, when you stop the engine and see if the clunk comes back next time you start the car.

I wonder if 2017 Jeep Wranglers with the 3.6, have something different? I have never heard such a sound on startup. Is the 3.6 in the Jeeps different than what is put in the Challengers? I think the Jeep is tuned for less peak HP and more flat torque curve, but basically the same motor.
yeah I havn't heard it in the Jeep.
Best regards
parrott
 

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That was likely me. I was hopeful others with a mystery thump or clunk in their car upon startup would have some insight.

It would perhaps be better to take the discussion of a rear- biased thump which may or may not coming from the stereo/subwoofer to another thread. I’m new to this blog and am not sure how to do that.
 

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That was likely me. I was hopeful others with a mystery thump or clunk in their car upon startup would have some insight.

It would perhaps be better to take the discussion of a rear- biased thump which may or may not coming from the stereo/subwoofer to another thread. I’m new to this blog and am not sure how to do that.
Hi BooDog, We sincerely regret to hear of your trouble. If it would be of interest, we'd be happy to learn more details regarding your dealer's findings to determine how to best assist you at this point. Please follow up with us via private message when you can.
Rob
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