2015 - 2016 Corvette: Service Bulletin: Diagnostic Tip for Harsh Shifts After Mileage Accumulation Without Previous Transmission Repairs and/or Calibration Updates
Estimated Reading Time: 2 Minutes#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 |
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Brand: |
Model: |
Model Year: |
Transmissions Built Between: |
Engine: |
Transmission: | ||
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Cadillac |
Escalade Models |
2015 |
2016 |
July 1, 2015 |
September 14, 2015 |
Equipped with 8L90 and 8L45 Automatic Transmission (RPOs M5U, M5T, M5N) |
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Cadillac |
ATS, ATS V, CTS, CTS V |
2016 |
2016 |
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Chevrolet |
Corvette, Silverado |
2015 |
2016 |
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GMC |
Sierra |
2015 |
2016 |
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Involved Region or Country |
North America and N.A. Export Regions |
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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:
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
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.