DTC P0732: Incorrect 2ND Gear Ratio: Condition

NOTE: If DTCs P0716, P0717, P0748 or P1500 are displayed on scan tool, diagnose these DTCs prior to DTC P0732.

Shift solenoids "A", "B" and "C", VSS, input/turbine speed sensor and TFT sensor function normally and vehicle speed is 17-60 MPH in 2nd gear with 3/8 throttle opening. Input/turbine speed sensor and VSS signals indicate that gear ratio is above set value. Possible causes:

Low ATF level.
Low hydraulic pressure.
Control valve stuck.
Solenoid valve malfunction.
TCM malfunction.
Forward clutch, 3-4 brake band, one-way clutch No. 1 slippage.