Subtle clunk at exactly 7MPH

[Branpute]

Hello All!

I’m new to the Jeep Gladiator Forums, and I just purchased a 2021 Jeep Gladiator Rubicon (in hydro blue), and I just wanted to see if another owner would be willing to test something for me.

Every time I accelerate to exactly 7MPH, after initially starting the truck, it makes a very subtle clunk noise. The thump seems to be felt from the driver’s footwell. This does not continue to occur after stops, after the auto-start/stop function runs, or any other time, other then after doing a full start of the truck. If I turn it off, restart it, and begin rolling forward, the subtle sound and clunk occurs at exactly 7MPH again.

Does anyone else observe this noise/clunk? If so, is this caused by some kind of normal startup procedure involving the powertrain? It’s obvious that it happens very deliberately, I just want to make sure that something isn’t functioning outside of spec on a truck with 300 miles on the clock.

I appreciate any feedback and/or observations you might be able to share! Thanks!

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[usnavycdr]

Is it the speed actuated locks?

 

[Chilli]

For us it's one of the neighbors finally letting loose of the truck & hitting the pavement.

They always want a ride when they see us leaving in our Gladiator

 

[Branpute]

Is it the speed actuated locks?

It is not the car locks. It’s a subtle clunk noise from under the truck.

 

[OldButStillJeeping]

Tailgate lock

 

[Caspien]

Happen to have a trailer hitch installed? I actually had a clunk that would happen around 11mph, and it took me a couple of days to figure it out.


(Mine was my hitch locking pin, holding my hitch cover in place.. it'd rotate and do a 'clunk'. After figuring it out, I just rotated it, so it would sit angled downward.. no more clunk for me

 

[ShadowsPapa]

For us it's one of the neighbors finally letting loose of the truck & hitting the pavement.

They always want a ride when they see us leaving in our Gladiator

You win - no one can top that one. Give this guy the trophy way. No way anyone can top that.

 

[ShadowsPapa]

Tailgate lock

That locks with the other locks - so he'd notice the doors locking.
Besides, the speed is all wrong for the door locks. It's well over 7 mph. I thought it was 15-20 so I looked it up - I was close - it's 15 -


Automatic Door Locks — If Equipped
The Automatic Door Lock feature default condition is
enabled. When enabled, the door locks will lock automatically when the vehicle's speed exceeds 15 mph

 

[RavensEyeOffroad]

Hello All!

I’m new to the Jeep Gladiator Forums, and I just purchased a 2021 Jeep Gladiator Rubicon (in hydro blue), and I just wanted to see if another owner would be willing to test something for me.

Every time I accelerate to exactly 7MPH, after initially starting the truck, it makes a very subtle clunk noise. The thump seems to be felt from the driver’s footwell. This does not continue to occur after stops, after the auto-start/stop function runs, or any other time, other then after doing a full start of the truck. If I turn it off, restart it, and begin rolling forward, the subtle sound and clunk occurs at exactly 7MPH again.

Does anyone else observe this noise/clunk? If so, is this caused by some kind of normal startup procedure involving the powertrain? It’s obvious that it happens very deliberately, I just want to make sure that something isn’t functioning outside of spec on a truck with 300 miles on the clock.

I appreciate any feedback and/or observations you might be able to share! Thanks!

mine does the same thing and my ford fiesta did it too. I think it might be something to do with the cruise control "ready-ing" itself maybe? Totally guessing.

 

[ShadowsPapa]

Now I'm going to have to stop when I get onto the road at the end of the driveway and take off again from 0 and try to listen.
Is this a RUBICON only thing, or do others hear the same thing?
It's absolutely not locks - those don't engage until 15 mph and you can tell because it's not really a clunk and it comes from the DOOR right next to you.

 

[ryandoubleu]

I’ve got the same thing and it has done it since I picked it up in April. It could possibly be the torque converter engaging.

 

[ryandoubleu]

Now I'm going to have to stop when I get onto the road at the end of the driveway and take off again from 0 and try to listen.
Is this a RUBICON only thing, or do others hear the same thing?
It's absolutely not locks - those don't engage until 15 mph and you can tell because it's not really a clunk and it comes from the DOOR right next to you.

Mine only happens after the initial pull off from startup. It doesn’t happen after coming to a stop

 

[Branpute]

Everyone, I really appreciate all the feedback already! It definitely isn’t a lock system. I actually disabled the auto locks in the infotainment system. It definitely sounds related to the powertrain when it hits that very specific speed only after initial start, not just from a normal stop. I’d be curious if this is trim-specific to Rubicon models.

If you’re a Gladiator owner, I’d love to hear if this subtle clunk noise occurs for you every time you push the engine start button, put into drive and roll up to 5-7MPH. You should be able to feel it in the pedals if you’re paying attention, if you have the same thing I have.

 

[just_another_guy]

I don't have a Rubicon and mine does it as well. Feels like a subtle abs test engagement

 

[Renegade]

mine does the same thing and my ford fiesta did it too. I think it might be something to do with the cruise control "ready-ing" itself maybe? Totally guessing.

Did you just make this up randomly? What the crap?

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