2015 - 2017 Corvette: Shake and/or Shudder During Light Throttle Between 25 and 80 mp
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    Post 2015 - 2017 Corvette: Shake and/or Shudder During Light Throttle Between 25 and 80 mp

    With thanks and credit to the Corvette Action Center, and elegant for locating this:

    2015 - 2017 Corvette: Service Bulletin: Shake and/or Shudder During Light Throttle Acceleration Between 25 and 80 MPH (40 and 128 KM/H) at a Steady State
    Last Updated: Thu, Mar 2, 2017 at 1:45 PM

    Some customers may comment on any of the following conditions:

    A shake and/or shudder during light throttle acceleration between 25 and 80 mph (40 and 128 km/h) steady state driving when transmission is not actively shifting gears.
    A shudder feeling that may be described as driving over rumble strips or rough pavement.
    For 2015-2016 vehicles, shudder feeling is evident in both Drive and M7 mode.
    For 2017 vehicles, shudder feeling is evident in both Drive and L7 mode.
    Diagnosis Instructions
    To ensure TCC shudder is diagnosed correctly, please drive the following schedule on a smooth road with transmission sump temperature between 122°F (50°C) - 158°F (70°C ).

    Important: For some road conditions, it may be required to apply the brake pedal and throttle simultaneously to stay within desired engine torque range, and engine/vehicle speed ranges.

    Run the following tests for 3 operational modes:

    A. Normal Operation (GDS2 for viewing only).

    B. GDS2 Commanding TCC in Disabled Operation. (TCC Open).

    C. GDS2 Commanding TCC in Enabled Operation. (TCC Locked).

    To confirm TCC shudder, the vibration concern must be created in normal operation (Mode A) of the test. If the concern is gone with the torque converter clutch disabled (Mode B, TCC Open) and is gone when the torque converter clutch enabled (Mode C, TCC Locked), the vibration root cause is TCC shudder and the fluid flush procedure corrective action described below should be performed.

    If the concern is not present in Mode A, then the vibration concern is not TCC shudder. If the concern is still present with the torque converter clutch disabled (Mode B) or with the torque converter clutch enabled (Mode C, TCC slip speed at zero), the root cause of vibration is NOT shudder. Vibrations not identified as shudder should be further investigated using the “Vehicle Vibration Diagnosis in SI as a starting point.

    The use of the PICO scope and NVH software can be used to confirm TCC shudder, Engine, Tire or Driveline component related conditions.

    To confirm TCC shudder record the PICO scope data while driving in 8th gear in the application specific condition above. Minimize extraneous vibration input by testing on a smooth road and correct any other known vehicle vibration issues (tires, brakes, etc.) before conducting test. If TCC Shudder is present, a vibration peak will appear (highlighted by arrow below) within +/-2 Hz of the frequency listed in the table above. TCC Shudder vibration frequency should remain constant in 8th gear as indicated in the above table. If the vibration frequency follows vehicle speed or engine speed, then it is NOT TCC Shudder.


    Service Procedure
    Important: Requires Mobil 1 Synthetic LV ATF DEXRON HP (GM Part No. 19353429, in Canada 19353430).

    Note: U.S. dealers must order the Mobil 1 Synthetic LV ATF DEXRON HP fluid through your local General Motors oil distributor. Canadian dealer must order through CCA.

    Step 1: Cooler Flush, Drain, Clean pan/magnet, Replace Filter (If needed), Oil Fill, & Circulate New Fluid

    Note: The Transmission Fluid Cooler Flow Test and Flushing procedure can be located by building the vehicle in SI, select Transmission, Transmission Cooling, Diagnostic Information and Procedures. Select the appropriate transmission.

    1 a.) Flush the cooler lines and cooler, refer to SI for proper procedure.

    Note: DEXRON VI transmission fluid may be used to flow and flush the transmission cooling system. Compressed air should be used to remove any residual fluid from transmission cooler lines.

    1 b.) Remove the transmission fluid pan and drain transmission fluid following SI procedures for the application you’re working on. Discard all oil.

    Note: If you find that the fluid is cloudy, milky, or appears to be contaminated with water or engine coolant, DO NOT proceed with below steps. Follow Both SI Procedures for “Cooling System Leak Testing (L83, L86)” and “Engine Coolant/Water in Transmission.”

    1 c.) Clean the pan/magnet if any metallic particles present and replace transmission filter if debris is found.

    1 d.) Install the transmission fluid pan and refill with new transmission fluid using enough volume to have oil come out of oil level check plug.

    Important: Operate the vehicle on the hoist for 10 minutes. Cycle through all forward gear ranges, Reverse and Neutral.



    Step 2: Drain, Oil Fill, & Circulate New Fluid

    2 a.) Remove the transmission fluid pan and drain transmission fluid again. Discard all oil.

    2 b.) Install the transmission fluid pan and refill with new transmission fluid using enough volume to have oil come out of oil level check plug.

    Important: Operate the vehicle on the hoist for 10 minutes. Cycle through all forward gear ranges, Reverse and Neutral.



    Step 3: Drain, Oil level Set, and Drive to Evaluate

    3 a.) Remove the transmission fluid pan and drain transmission fluid again. Discard all oil.

    3 b.) Install the transmission fluid pan and refill with new transmission fluid following the “Fluid Fill Procedure” in SI to obtain correct fluid level.

    The shudder should be improved after the completion of this triple flush procedure.

    Note: Shudder should improve directionally right away, but for full affect the vehicle may need to be driven up to 200 miles (322 km). and at least two cold to hot drive cycles before determining if the fluid flush corrected the condition or not. Do not re-evaluate vehicle for additional customer shudder concerns until the vehicle has been driven 200 miles (322 km).

    Warranty Information
    For vehicles repaired under the Bumper-to-Bumper coverage (Canada Base Warranty coverage), use the following labor operation. Reference the Applicable Warranties section of Investigate Vehicle History (IVH) for coverage information.

    LABOR OPERATION

    DESCRIPTION

    LABOR TIME

    8480478*

    Flush and Drain Fluids for Transmission Shake and/or Shutter Repair

    Use Actual Clock Time

    *This is a unique Labor Operation for Bulletin use only.

    -----------------------------------------------------------------------------------------------------

    For a complete listing of TSBs please see https://www.stingrayforums.com/forum/...tml#post184236
    Last edited by jsvette; 03-03-2017 at 09:35 AM.
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    This is one interesting TSB on driveline vibration, that per this TSB, re the '15-17 automatics that are experiencing this could be caused by transmission fluid issues. Wonder how many torque tubes and more have been erroneously replaced, prior to this brand new TSB being identified.
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    Quote Originally Posted by elegant View Post
    This is one interesting TSB on driveline vibration, that per this TSB, re the '15-17 automatics that are experiencing this could be caused by transmission fluid issues. Wonder how many torque tubes and more have been erroneously replaced, prior to this brand new TSB being identified.
    I wondered the same thing John.
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    I've been having these issues as well.
    Torque converter has been changed. 3rd gear bump is still there at about 2200-2500 RPM. They flushed out the Tranny 3 times process. Bump is still there. BUT.......... soon after ( approx. 1000km) NOW I get the feeling of going over rumble strips at 1800-2000 RPM. On any gear and on manual or auto mode. Whether you are accelerating or not. Now they are about to change the Torque converter tube. Parts on order. I really hope this works. It also happens in park position. Grrrrrr

    Now!
    They have changed the torque converter tube now. All seems good after driving about 300km testing it out in all modes. Auto or manual. They said the flex plate was fine. They claim there's a bearing on the one end of tube that was getting loose and causing the vibration. I guess we'll see what this one does.
    3rd gear thump (manual mode) still there. I'll see how this goes for now.
    I think I'm ready to write a letter to GM. Cause this ain't just a loose wire problem. This is what drives the car.

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    In the automotive business its always interesting that what worked last year doesn't the following year. Must be an axiom or a genie. Charlie aka cutnout
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    Well, I've been bitten by the torque converter bug. Absolutely terrible condition that feels like my '16 Stingray is going to sling me out of the car any minute. I've taken it to the dealer who flushed the tranny 3 times but it didn't fix a thing. Now I have to wait a week for the parts and who knows how long it will take to actually fix the problem. It looks like this issue has been going on since day one. Isn't it time for GM to issue a recall? Please let me know if anyone had this condition and it was fixed or any updates to this issue. Thanks.
    Last edited by elegant; 08-09-2017 at 03:08 PM.
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    Quote Originally Posted by ronjohn11 View Post
    Well, I've been bitten by the torque converter bug. Absolutely terrible condition that feels like my '16 Stingray is going to sling me out of the car any minute. I've taken it to the dealer who flushed the tranny 3 times but it didn't fix a thing. Now I have to wait a week for the parts and who knows how long it will take to actually fix the problem. It looks like this issue has been going on since day one. Isn't it time for GM to issue a recall? Please let me know if anyone had this condition and it was fixed or any updates to this issue. Thanks.
    Oh, that is really sad news. How many miles do you have on it?
    Last edited by elegant; 08-09-2017 at 03:09 PM. Reason: Edited quoted section only.
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    2015 - 2017 Corvette: Shake and/or Shudder During Light Throttle Between 25 and 80 mp

    Currently have 7,751. I need about 20 more miles to complete the recommended requirement. I'm not that technical but I think my dealer has done the steps specified in the TSB. Now I am waiting on the dealer to call me when he gets the parts. My dealer did the road test with the PICO scope(???) and flushed the tranny according to TSB 16-NA-175.
    Last edited by ronjohn11; 08-10-2017 at 06:06 PM.
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    It would appear our C7 has developed this issue at approx. 8,200 miles. Many thanks for posting this TSB , as it will make things easier when I take the car in.
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    I took the car in two weeks ago for the shudder and rpm fluctuation problems. The tech and I took it for a test run and it shuddered and the rpm fluctuated. I was in the passenger seat and was able to observe that the fluctuation corresponded with the shudder. I left the car for diagnostics, expecting that the triple flush of the torque converter would be the solution. Not so. Bowling Green told them the torque converter was the problem and to replace it. That is major surgery as the rear bumper is removed and the rear drivetrain is completely removed and put on a bench. Not only does the car now have a new torque converter, it also has new bolts to hold it together and a new cable running to the gear shifter. I suspect the torque converter is a new vintage, i.e. part number. The tech drove it for 50 miles to check it out and all went well. I have it back and it is running better than ever. Thanks to the team at Parks Chevrolet of Augusta for solving the mystery.
    elegant and Vigilance247 like this.

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    I am going to change/flush my tranny fluid next month. THIS is handy and timely will advise I want this TSB performed to make sure all of the GM fluid is gone then add my Amsoil.

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    Senior Member West Ham Utd's Avatar
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    Update :

    Got the car back last night, after having the transmission flushed as per 16-NA-175. Had a quick chat with the Tech ( wanted to make sure he got a few $ as gratitude) & he said to drive at least 300 miles before deciding if the car needed further work or diagnostics.
    It could be my imagination, but the C7 seemed to shift much slicker in manual mode on the drive home & I didn't experience any tell- tale shudders. Too early to say it's fixed, but quietly confident that the fluid change might be all that is needed for this C7.
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    UPDATE: Got my C7 back the other day with a new TC. The ride home was much smother with the new TC. I don't really know if I got a redesigned TC or just not another TC. If it was just another TC I expect the terrible shutter to reappear in another 7,000 to 8,000 miles. I'm probably a little paranoid having the shutter demon because every little road vibration makes me think the shutter demon is raring its ugly head. It's pretty hard driving with my finger crossed hoping I never feel that demons presence the rest of my life.
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    Quote Originally Posted by ronjohn11 View Post
    UPDATE: Got my C7 back the other day with a new TC. The ride home was much smother with the new TC. Driving with my finger crossed hoping I never feel that shutter demons presence again.
    Glad it is fixed, and we all hope you never experience it again!
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    Junior Member Gtalley's Avatar
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    Did you get a new TC or a whole new trannie? I just had mine in and they did the flush thing. A title better but not fixed. I am callin them tomorrow to let them know and push for anew TC or trannie. Do you know if these new parts are redesigned or just a different same type? Thanks

    Greg

    UPDATE. I got my car back a few days ago after having the TC replaced. I haven't driven it much but the shudder problem appears to be gone. I hit the sweet spot for the shudder (1300-1500 rpm) and it was as smooth as silk. The car seems to drive much smoother. No rattles or anything either after having the back end off to replace the TC. So far I am a very happy camper. I will get some more miles on it to be sure. BTW the dealer (Lindsay Chevrolet in Woodbridge Va) did an amazing job and keep me posted all along the way. When I picked mine up he told me there were 6 others in line to have the TC replaced. He also read somewhere that approx. 30% of the vets out there have this problem. Good luck to all going through this.

    Greg
    Last edited by Gtalley; 10-30-2017 at 11:51 AM.

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