Shift Solenoid Valves
WARNING: This page is about a different variant/trim than selected.
The Hydra-matic 5L40-E uses three electromagnetic shift solenoid valves 1-2, 2-3 and 4-5 to control upshifts and downshifts in all forward gear ranges. The shift solenoid valves are all identical, normally closed, 3-port, ON/OFF type solenoids controlled by the TCM. These shift solenoid valves work together in a combination of ON and OFF sequences to control the various shift valves. The TCM uses numerous inputs to determine which solenoid state combination the transmission should be in. Refer to Shift Solenoid Valve State and Gear Ratio .