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'clunk' sound when descelerating

Discussion in 'Model S' started by Caloncho, Nov 21, 2016.

  1. Caloncho

    Caloncho LongerTelomeres?

    Joined:
    Nov 18, 2013
    Messages:
    89
    Location:
    NewYork USA
    Hi all,

    Since last week I have a clunky (imagine throwing a heavy bolt into a metal paperbasket lined with paper towel) sound when the gas pedal is released and regen engages. There also may be a slight clunk when regen is switched back to accelerating. Not loud but noticeable.

    Opinions please,

    Cal

    PS. kindly redirect if forum selection is incorrect.
     
  2. scottm

    scottm Active Member

    Joined:
    Jun 13, 2014
    Messages:
    2,457
    Location:
    Canada
    Known issue. After the bigger clunk of your wallet hitting the floor when you first buy Tesla.

    Get service to bolt your motor back in place with a new mount.
     
    • Like x 3
    • Funny x 2
    • Disagree x 1
    • Love x 1
  3. steve841

    steve841 Active Member

    Joined:
    Jan 17, 2010
    Messages:
    1,629
    Location:
    Ft. Lauderdale, FL
    +1 ^^^
     
    • Like x 1
  4. PaulusdB

    PaulusdB Mayor Gnomus Vintage Limb

    Joined:
    Jul 12, 2013
    Messages:
    4,942
    Location:
    Europe
    From my last service invoice:
    Concern: Customer states that when he drives at lower speed, he has the impression that there is a "clunck" in the drive train of his car.
    Corrections: Rear drive unit general diagnosis
    Confirmed customer state (sic)
    A clunck noise is audible, coming from the rear of the vehicle. The noise is coming from the drive unit. Needs replacement to resolve issue.
    Corrections: Drive Unit - Rear - Large
    Replaced rear drive unit, tested and confirmed correct operation.
    Corrections: Halfshafts - lubricate at hubs LH/RH
    Lubricated rear drive shafts at hubs
    Corrections: Perform validation test drive
    Performed validation test drive and confirmed that the vehicle is as designed.
    Corrections: Install LH/RH harness connector covers
    Replaced electric park brake connector covers
    Total Labor & Miscellaneous Items
    Pay Type: Warranty​
    FYI: The mentioned confirmation of my 'clunck noise' statement consisted of the service employee reversing my car out of the parking spot for one or two feet.
     
  5. mknox

    mknox Well-Known Member

    Joined:
    Aug 7, 2012
    Messages:
    9,893
    Location:
    Toronto, ON
    Known and long discussed issue around here. I've had several drive unit replacements and several driveshaft and wheel hub repairs to boot. I'm okay now, but hope it holds out.
     
    • Like x 1
  6. gaswalla

    gaswalla P4201/85/airsusp/pano/19i

    Joined:
    Sep 23, 2012
    Messages:
    1,997
    Location:
    San Diego
    Hi, I have a high mileage Model S (>130k mi). I took it in for a similar issue: (it was not the drive unit)

    Concern: Customer states: There is a clunk noise coming from under vehicle that occurs

    when accelerating from a stop, and when regenerative braking starts. Please inspect and

    advise.

    Corrections: Rear Motor General Diagnosis

    Confirmed rear axles make clicking noise when moving from reverse to forward

    acceleration from stop.

    Corrections: Halfshafts - Lubricate at Hubs LH/RH

    Removed rear axles from hubs to access, clean and lubricate rear axle splines. Confirmed

    no further noise upon completion.
     
    • Like x 1
  7. SeminoleFSU

    SeminoleFSU Voluntaryist

    Joined:
    Apr 5, 2013
    Messages:
    1,019
    Location:
    Atlanta, GA
    I just brought my P85 back in for a 5th service at 69k. Had the droning and the clunk was getting pretty bad. They swapped out the entire drive unit for the droning, which apparently also fixed the clunk? They really need to get this resolved. Having a DU and half-shafts that only last 10-15k miles is getting old. I hope this 3rd (or is it 4th I can't remember anymore) DU is the last one I'll ever need. It took them a week to get this work done and I got a nice fully loaded MX P100DL (which I greatly appreciate) but I worry about the costs in man hours and miles on their loaner each time this comes up for long term company viability... seems semi-unsustainable to keep having to do this so often. And I don't even drive my car that hard... I'm also 90% highway miles.

    Concern: Customer: states there is a drone type noise above 65mph

    Pay Type: Warranty
    Corrections: Drive Unit - Rear - Large
    Clicking sound found to be internal to drive unit requiring replacement of drive unit.
    Replace rear drive unit.
    Completed.

    Part Quantity
    ASY,P-TRAIN,RMN,MDLS,SPORT,CMC,HS
    (1025598-00-P)


    ASY,HV COVER,INVERTER (1003783-00-B) 1
    SIDE MOTOR MOUNT ASSEMBLY (1028034
    -00-B)


    ----------------------------------
    Concern: Customer: states there is a clunk/tick noise coming from the rear

    Pay Type: Customer Pay
    MISC Items: NO LABOR PERFORMED
    Sounds in this task related to correction in job 2 (above).
     
  8. widodh

    widodh Model S 85kWh

    Joined:
    Jan 23, 2011
    Messages:
    5,963
    Location:
    Middelburg, The Netherlands
    I had this as well on my S85 from 2013 which already had two DU replaced.

    Brought it to Tilburg, NL and they fixed it in 1 hour for €65.

    It was something in the driveshaft where the rear wheels are attached. Something with rust and not enough grease.

    They replaced some tiny parts and applied grease. It’s gone now.
     
    • Informative x 1
    • Like x 1
  9. SeminoleFSU

    SeminoleFSU Voluntaryist

    Joined:
    Apr 5, 2013
    Messages:
    1,019
    Location:
    Atlanta, GA
    They've done that procedure on mine before in the past and it helps the problem for a while but it will come back and require a DU replacement eventually. The DU is so powerful it wears the teeth on the gears and will eventually lead to clunk/whine/moan, then once enough teeth are sheered off, you'll get complete failure. I think Tesla has been trying to improve the design to avoid this but it just happens eventually on RWD teslas. The RWD configuration puts a strong rear motor in the rear that is almost too powerful for the parts it's connected to. The extra power output of the performance version can lead to quicker wear especially if you're an aggressive driver. My guess is this wearing happens the most on launches when stress is the highest. Punching it at highway speed less likely to cause the issues, mostly from stop. This flaw is why Tesla went to the AWD model so quickly (IMO)
     
  10. widodh

    widodh Model S 85kWh

    Joined:
    Jan 23, 2011
    Messages:
    5,963
    Location:
    Middelburg, The Netherlands
    Hmm, ok. They however told me it wasn’t in the DU itself, but where the axle attaches to the wheels. Not somewhere near the motor nor gearbox.

    Time will tell I guess.
     

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