If this is the only code, then ask the dealer to reset the Variable Line Pressure info in the PCM. This will clear the code. They can do this in about 10 to 15 minutes using their scan tool. Below is some infor related to this code.
P1745-TRANSMISSION LINE PRESSURE TOO HIGH FOR TOO LONG
For a complete wiring diagram, refer to the Wiring Information.
Theory of Operation
This DTC is an informational DTC to inform the technician that transmission has been operating in an open-loop line pressure control for 3220 kilometers (2000 miles) or 1000 2-3 upshifts resulting from a Line Pressure DTC. The 42RLE Transmission is not designed to operate in open-loop line pressure control for an extended period time. This DTC is intended to protect the transmission. If the DTC sets, the transmission controller will place the transmission into limp-in mode.
- When Monitored:
Continuously with ignition on.
- Set Condition:
If the transmission has been operating in an open-loop line pressure control for 3220 kilometers (2000 miles) or 1000 2-3 upshifts.
LINE PRESSURE DTCS PRESENT
Always perform the 42RLE Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure)
CHECK FOR RELATED DTCS
1.With the scan tool, check for Transmission Line Pressure DTCs.
NOTE:In order to erase this DTC you must reset (erase) the VLP Shift Counter and the Output tooth counter. This is a single procedure in the scan tool called “Clear Variable Line Pressure (VLP) counters".