The Technical Definition: This is a manufacturer-specific code for Chrysler/Jeep indicating that the transmission line pressure has remained higher than expected over an extended period (like 1000 shifts or 2000 miles).

Common Symptoms: The transmission is forced into limp mode to prevent catastrophic damage, resulting in the vehicle being stuck in 2nd gear with harsh shifting and an illuminated check engine light.

Typical Fix: The root cause is often a faulty line pressure solenoid, a defective solenoid pack, or contaminated fluid. Crucial note: After fixing the mechanical issue, a standard code reader cannot clear P1745. It requires a bi-directional scanner to perform a "Clear Variable Line Pressure (VLP) counters" reset.