1-2 Shift Solenoid Valve

The 1-2 Shift Solenoid valve is attached to the valve body and is a normally open exhaust valve. The VCM/PCM activates the solenoid by grounding the solenoid through an internal quad driver. The 1-2 Shift Solenoid valve is ON in First and Fourth gear, but OFF in Second and Third gears. When ON, the valve redirects fluid to act on the shift valve. The 1-2 Shift Solenoid valve is usually blue in color.

One diagnostic code is associated with the 1-2 Shift Solenoid valve: Code P0753. The VCM/PCM continually monitors the 1-2 Shift Solenoid circuit for expected voltage. If the voltage reading is not what is expected on the circuit, Code P0753 will be set. the VCM/PCM will default to maximum line pressure, freeze shift adapts from being updated and the MIL will not illuminate. Recovery can occur on the next ignition cycle.