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    Default 2016 Cadillac CTS-V: Service Bulletin: Diagnostic Tip for Harsh Shifts After Mileage Accumulation

    #16-NA-213: Diagnostic Tip for Harsh Shifts After Mileage Accumulation Without Previous Transmission Repairs and/or Calibration Updates - (Jun 28, 2016)

    Subject: Diagnostic Tip for Harsh Shifts After Mileage Accumulation Without Previous Transmission Repairs and/or Calibration Updates

    Brand: Model: Model Year: Transmissions Built Between: Engine: Transmission:
    from to from to
    Cadillac Escalade Models 2015 2016 July 1, 2015 September 14, 2015 Equipped with 8L90 and 8L45 Automatic Transmission (RPOs M5U, M5T, M5N)
    Cadillac ATS, ATS V, CTS, CTS V 2016 2016
    Chevrolet Corvette, Silverado 2015 2016
    GMC Sierra 2015 2016

    Involved Region or Country North America and N.A. Export Regions
    Condition Some customers may comment that the transmission has developed a harsh shift. This harsh shift condition will have developed over mileage accumulation. In many instances the transmission has not had any previous repairs performed. There may be more than one shift that is harsh and may be grouped as follows:

    • 1-2, 5-6 and 7-8
    • 3-4 and Park or Neutral to Reverse
    • 6-7 and 3-1

    Performing TSB 16-NA-019: Information on Transmission Adaptive Functions and Correcting Low Mileage Harsh Shifts, Slips, or Flares for 2016 model year vehicles or 14-07-30-001: Information on Transmission Adaptive Functions and Correcting Low Mileage Harsh Shifts for 2015 model year vehicles may correct the condition for a short period or will not improve the condition.
    Vehicles that have had a recent transmission replacement, valve body replacement, Service Fast Learn (SFL) or Service Programming event should complete the appropriate drive learn procedure. TSB 16-NA-019: Information on Transmission Adaptive Functions and Correcting Low Mileage Harsh Shifts, Slips, or Flares for 2016 model year vehicles or 14-07-30-001: Information on Transmission Adaptive Functions and Correcting Low Mileage Harsh Shifts for 2015 model year before proceeding with recommendation/instructions.
    Note: Any valve body replaced in service would have been produced after the suspect date range.
    Service Procedure

    2016 Cadillac ATS-V: Service Bulletin: Diagnostic Tip for Harsh Shifts After Mileage Accumulation-2015-2016-corvette-transmission-date-code-jpg
    Check the julian date of the transmission by reviewing the TUN number on the side of the transmission. Transmissions built between July 1, 2015 (julian date 182) and Sept 14, 2015 (julian date 257) may have a suspect Clutch Control Solenoid.
    TUN decoder See example below:

    • Third and Forth digit Calendar Year 15
    • Fifth, Sixth and Seventh digits day transmission was produced 241
    • This transmission was produced on August 29, 2015

    If the transmission julian date is between 182 and 257 the valve body should be replaced.
    Attached Thumbnails Attached Thumbnails 2016 Cadillac CTS-V: Service Bulletin: Diagnostic Tip for Harsh Shifts After Mileage Accumulation-2015-2016-corvette-transmission-date-code-jpg  
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  2. #2
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    Default Harsh Shifts

    I just dropped my 2016 CTS V off at the dealer this morning for harsh shifting from 3rd to 4th gear. After the hard shift it intermittently has a vibration similar to driving over a rumble strip. The car has 7000 miles. The dealer couldn't duplicate but it happens every time I drive it. The first 2 miles it shifts like butter than it starts like clock work. They are performing a GM clutch service bulletin that is supposed to address it. Apparently after the SB is incorporated the car has to sit for 8 hours then driven a specific way to teach the 5 clutches. I'm hoping it fixes it, I love the car but I won't keep it if they can't fix it. It would be ridiculous to pay over $90K and have this type of problem.

    DeBob

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