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Discussion Starter #1
I have been having this issue for the past 2 months. When I shift the gear in reverse and start moving a bit, the car makes one loud noise and whole car jerks, then it reverses fine. The sound comes only once when I first start reversing, but it happens everytime I shift to reverse and the car moves about 5ft. The first time it happened I thought I hit something. I think the sound is coming from the back of the car but I cant be sure.

This happens regardless of the outside temprature, or if l drive it a few miles, everytime i shift into reverse and move back a few feet...boom, the sound comes and the car jerks.

Any ideas what could be causing this? Did anyone experience this before?

My car is a 2013 santa fe sport, 6 cylinder gasoline engine, AWD.
 

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I just had this happen to mine. Jerkiness when reversing, or turning a corner from a stop. It was one of the couplers. Had it replaced and all good to go now
 

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Discussion Starter #5
I don't think this is the same case, since mine only happens in reverse, and it is a single sudden jerk with a loud noise, like something broke suddenly. I checked the car for faults, nothing unusual showing up.
 

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This happens after moving about 5 feet? Almost has to be tire rotation related (As it pertains to the drive line) as just about everything else should have rotated more than once already.....So....Tires, wheels, axle shafts....rear differential.....Might be able to pin it down if you have someone stand outside of the vehicle on each side when you reverse.

Is this only the first time you reverse after the vehicle sits for a few to several hours, or every time you back up?
 

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I have been having this issue for the past 2 months. When I shift the gear in reverse and start moving a bit, the car makes one loud noise and whole car jerks, then it reverses fine. The sound comes only once when I first start reversing, but it happens everytime I shift to reverse and the car moves about 5ft. The first time it happened I thought I hit something. I think the sound is coming from the back of the car but I cant be sure.

This happens regardless of the outside temprature, or if l drive it a few miles, everytime i shift into reverse and move back a few feet...boom, the sound comes and the car jerks.

Any ideas what could be causing this? Did anyone experience this before?

My car is a 2013 santa fe sport, 6 cylinder gasoline engine, AWD.
Jack up the rear end and rotate the tires by hand. May find it is brake issue. Nothing? Put it up in the air and run it.
 

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Discussion Starter #9
Update...

I jacked up the car and shifted to reverse, no sound! tried a few times more, no sound! dropped it back to the ground and tested, no sound! it just disappeared. not sure if I should be relieved or worried that some catastrophic failure is on the way.

Nothing unusual under the car. the mechanic took a look under and told me nothing is out of place and bearings are good. also AWD coupler working normally.

Lets see how this progresses.

Thanks for all the suggestions.
 

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Hi , any news with your problem, did it appear again or it is solved. I think I might have the same issue and I might try your way.
 

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Hi there. Any updates on this one? I've had the exact same starting to happen with my 2013 Highlander. Keen to hear any further progress. Currently booked into Hyundai for diagnosis, but keen to avoid $160 per hr fee if possible!!
 

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Discussion Starter #12
LAST UPDATE... It turns out the sound was coming from the transfer case. How did I know you may ask? Well, that ugly jerk and its loud noise came back one last time, and the transfer case shattered pissing all its oil on the pavement. The car still runs on front wheel drive and actually uses less fuel. Not worth repairing since a new transfer case for a santa fe will set me back $2,800 without labour charges.
 

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Transfer case? Okay. Good to know as I have 2016 AWD and it started doing the EXACT same thing. 5ft and clunks. The only difference is that it doesnt do it every time on flat surface. However, does it every time I back into my driveway which is on a slight incline. As I always back into my driveway and after traversing the driveway curtain which will bounce the SFS then reapply the gas, boom, that noise that sounds like clunk thud. Question is, what can be done to make it stop and prevent this issue you ended up with?
 

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Thankyou. I had reported the same problem with my 2011 ix35 petrol highlander 115k.
I can idle in and out of spaces in reverse without the clonk but if I apply power or am on a slope it will clonk pretty bad. I have been really nursing it hoping to find a solution.
Many service agents have looked at it and found nothing or charged me for seemingly related issues (like an engine mount and loose exhaust mounting, rear suspension and loose panels) or given me driving advice like delay moving into reverse after stopping and only take off on slopes using handbrake.

Is there a relatively inexpensive fix that can be done or is it the whole transfer assembly? I have recently had the awd clutch ass. in the rear diff replaced for knocking noises when turning from stopped. I hoped it would have solved both the transmission noises.
 

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Thankyou. I had reported the same problem with my 2011 ix35 petrol highlander 115k.
I can idle in and out of spaces in reverse without the clonk but if I apply power or am on a slope it will clonk pretty bad. I have been really nursing it hoping to find a solution.
Many service agents have looked at it and found nothing or charged me for seemingly related issues (like an engine mount and loose exhaust mounting, rear suspension and loose panels) or given me driving advice like delay moving into reverse after stopping and only take off on slopes using handbrake.

Is there a relatively inexpensive fix that can be done or is it the whole transfer assembly? I have recently had the awd clutch ass. in the rear diff replaced for knocking noises when turning from stopped. I hoped it would have solved both the transmission noises.
I have had my vehicle into a specialist Transmission Company for diagnostic and repair. They were able to replicate the clonk issue initially and then drove the vehicle with the rear drive disengaged. There was no reversing problems. They drained and examined the fluid and movement of the transfer assembly (on my request) and were satisfied it was operating correctly. They did however notice on the diagnostic computer when changing to reverse that there is quite a delay to engage torque after selecting reverse and starting to move. They have referred me back to Hyundai as they believe it looks like a software problem. I discussed why the transfer assembly might shatter as mentioned above. Perhaps this is the weakest link in the drive train and broke when torque suddenly applied.

Since collecting the vehicle the fault has not recurred so I will wait before taking it to hyundai. This might give me the time to find which agency has best service dept.
 

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I have had my vehicle into a specialist Transmission Company for diagnostic and repair. They were able to replicate the clonk issue initially and then drove the vehicle with the rear drive disengaged. There was no reversing problems. They drained and examined the fluid and movement of the transfer assembly (on my request) and were satisfied it was operating correctly. They did however notice on the diagnostic computer when changing to reverse that there is quite a delay to engage torque after selecting reverse and starting to move. They have referred me back to Hyundai as they believe it looks like a software problem. I discussed why the transfer assembly might shatter as mentioned above. Perhaps this is the weakest link in the drive train and broke when torque suddenly applied.

Since collecting the vehicle the fault has not recurred so I will wait before taking it to hyundai. This might give me the time to find which agency has best service dept.
I've got the same issue, when you reverse up and incline or turn when reversing I hear a clunk coming from the transfer case, happens after the power is applied and it's been reversing for about 2--5 seconds.

Anyone that actually managed to get it sorted without a replacement of the transfer case?
 
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