Drive Range, Third Gear: Notes
WARNING: This page is about a different car, the 2010 GMC Sierra and 2010 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
As vehicle speed increases and operating conditions become appropriate, the transmission control module (TCM) processes input signals from the input and output speed sensors, the throttle position (TP) sensor and other vehicle sensors to determine the precise moment to command ON the normally low pressure control solenoid 2 trim to regulate 1-3 clutch apply. At the same time the normally high pressure control solenoid 3 trim is commanded OFF, and the transmission shifts into Third gear.