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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, Second Gear >> Notes

Overdrive Range, Second Gear: Notes

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

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