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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Automatic Transaxle - 4T80-E - Introduction (2 Of 2)) >> Description and Operation >> Automatic Transmission Hydraulic Diagrams >> Overdrive Range, Fourth Gear >> Notes

Overdrive Range, Fourth Gear: Notes

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As the speed of the vehicle continues to increase, the Powertrain Control Module (PCM) monitors the input signals from various engine and transmission sensors. The PCM uses this data to energize the 1-2 shift solenoid (SS) valve in order to shift the transmission into fourth gear at the appropriate time.

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