2-3 Shift Solenoid Valve
The 2-3 SS valve is a normally open exhaust valve that is attached to the valve body. The PCM/TCM controls the solenoid by grounding the solenoid through an internal quad driver. The 2-3 SS valve is ON in THIRD and FOURTH gear. When commanded ON, the 2-3 SS valve directs fluid to act on the 2-3 shift valve.
There are 2 PCM/TCM related DTCs associated with the 2-3 SS valve: P0756 and P0758.
The PCM/TCM monitors the 2-3 SS circuit for an open or short to ground condition. If the PCM/TCM detects an open or short to ground condition, DTC P0758 sets. If the PCM/TCM detects an incorrect gear ratio, DTC P0756 sets. When DTC P0758 or P0756 sets, the PCM/TCM commands maximum line pressure, freezes shift adapts from being updated, and inhibits 3-2 downshifts.