What does code P1578 mean?

P1578 · VolkswagenRight Engine Mount Solenoid Valve Electrical Fault In Circuit

P1578 on Volkswagen vehicles indicates an electrical fault in the circuit for the right engine mount solenoid valve, which is the active mount that adjusts damping to reduce vibration. The engine control module (ECM) monitors the circuit and sets this code when it detects an open, short, or out-of-range condition, meaning the valve is not receiving the command or feedback it expects.

SystemPowertrain

Code typeVolkswagen specific

SeverityLow

Fix difficultyIntermediate

AreaVehicle speed, idle control and auxiliary inputs

Guidance is general and written for Volkswagen vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.