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P1577

Right Engine Mount Solenoid Valve Open Circuit.

  • Volkswagen
  • Powertrain
  • Manufacturer code
  • Low severity

How this code is built

P
SystemPowertrain
1
Defined byThe manufacturer
5
AreaVehicle speed, idle control and auxiliary inputs
77
FaultThe specific fault in that area

What it means

On Volkswagen, P1577 means the engine control unit has detected an open circuit in the control side of the right engine mount solenoid valve. This valve switches vacuum to the electronically controlled (switchable) hydraulic engine mount, which firms up or softens the mount depending on engine speed and load. The control unit sees no current flow or an impossible voltage when it tries to drive the valve, so it sets the fault.

Symptoms

  • Engine management warning light on
  • More vibration or shake through the cabin at idle
  • Rough or boomy feel when the engine is idling in gear
  • Increased noise or vibration when starting or stopping the engine
  • No obvious drivability change in some cases

Possible causes

  • Faulty right engine mount solenoid valve (internal open coil)likely
  • Damaged, chafed or broken wiring between the valve and the control unitlikely
  • Corroded, loose or pushed-out pins in the valve connectorlikely
  • Heat or oil damage to the harness near the engine mountpossible
  • Missing or open supply feed or fuse to the valve circuit (depends on model and engine)possible
  • Fault inside the engine control unit output driverrare

How to diagnose

  1. Read all stored fault codes and freeze frame data, note whether the fault is current or intermittent, then clear and see if it returns
  2. Visually inspect the valve, its connector and the harness for chafing, heat damage, oil contamination and corrosion
  3. Wiggle-test the harness and connector with the fault monitor live to see if the fault appears or drops out
  4. Use the diagnostic tester's output test, if the model supports it, to see whether the valve clicks when commanded
  5. Measure the valve coil resistance and compare it with the specification for your model and engine
  6. Check for supply voltage and ground at the connector with the ignition on, using the wiring diagram for the vehicle
  7. Check wire continuity from the connector to the control unit pins and test for shorts to earth or supply
  8. Inspect the vacuum lines to the mount for splits or disconnection once the electrical side is cleared

How to fix

  • Replace the right engine mount solenoid valve if its coil is open circuit
  • Repair or replace damaged wiring, using proper soldered and sealed repairs
  • Clean, repair or replace the connector terminals and secure the connector fully
  • Restore any missing supply feed or replace a blown fuse after finding why it failed
  • Replace or repair vacuum lines found split or disconnected
  • Replace the control unit only after all wiring and the valve have been proven good

Can I keep driving?

Low severity

The car is generally safe to drive, as the fault mainly affects vibration isolation and comfort. Book it in soon, particularly if vibration is noticeable, as a worn or poorly controlled mount can increase stress on other components.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.

This code for other makes

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