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What does code P0594 mean on a 2002 Dodge diesel truck?

P0594 on a 2002 Dodge diesel truck typically means "Variable Valve Timing (VVT) Solenoid Circuit Range/Performance." This indicates a problem with the electrical circuit controlling the variable valve timing system (which is crucial for fuel efficiency and performance in diesel engines). The problem could be in the solenoid itself, the wiring to the solenoid, the PCM (Powertrain Control Module) or a problem within the VVT system it controls.