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It is part of the transmission.
The 2-3 solenoid valve controls the Transmission Fluid to the 2-3 shift valve. Ignition voltage is supplied to the solenoid. The PCM output driver provides the ground. When the shift solenoid voltage is commanded on, the PCM senses 0 volts, when it is commanded off, the PCM senses ignition voltage. When the PCM detects voltage limits that do not meet the calibration, then DTC P0758 sets.
When the PCM detects an OPEN, a short to ground or a shorts to power on the 2-3 shift solenoid valve circuit the code is set.
The following actions are taken
MIL lights
Service Engine and Service Trans lights
PCM commands second great starts (this is your sluggish feeling)
PCM commands default line pressure (this is your rough shifting)
PCM disables steady state adapts
PCM disables garage shift adapts
PCM inhibits TCC
PCM inhibits torque management
This is either a bad 2-3 shift solenoid or the associated wiring or a bad connection at the main transmission plug. Replacing the shift solenoids (there are 2) is an easy job, they are in the lower pan, but the lower control valve must come off and there are a few check balls that must go back correctly.
(copied from caddyinfo.com)
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