This bulletin applies to 2016-2019 Cadillac ATS, 2016-2018 CT6, 2016-2019 CTS and 2015-2018 Escalade vehicles, equipped with an 8L45 or 8L90 automatic transmission.
Customers may comment that the vehicle will not obtain Park at times. This condition may be caused by a damaged parking pawl and/or parking pawl actuator. The transmission may have experienced a park engagement while the vehicle was in motion or the transfer case obtained a neutral state.
Attempt to duplicate the No Park condition by operating the shift lever. The shift lever should move more freely through all positions. Check the transfer case for proper operation in each range. Inspect the shift cable system and mounting bracket for any signs of visible damage or mis-routing.
Remove the transmission oil pan and valve body. Remove the park pawl actuator bracket and discard the bolts.
Remove the park pawl actuator. Inspect for damage, bent rod or incomplete travel of the actuator. Inspect the park pawl for damage.
If damage to the park pawl actuator and/or park pawl is present, replace the following:
- Park pawl actuator
- Park pawl
- Main shaft detent lever hub pin
- Park pawl actuator bracket
- Park pawl actuator bracket bolts
- Output carrier
Note: the transmission should be disassembled and cleaned thoroughly.
