33110

Bulletin number

GCUS-3-696

Component

Power train: automatic transmission: torque converter

Summary

33110 - Service Update. When a commanded shift occurs outside of the expected transmission turbine speed window limits, the commanded shift monitor requests a driver defaulted 8th gear state. The torque associated with the default action results in broken turbine shaft. The calibration window (based on output speed) for the safety monitor (P16F3) is smaller than the calibration window for the driver initiated TAP downshift speed limit checks. Dealers will reprogram the transmission control module.

Owners of these vehicles have filed 48 complaints in the transmission category.