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DTC codes / Volkswagen codes / P1584

P1584 · VolkswagenTransmission Mount Valves Short To Ground

P1584 on Volkswagen vehicles means the transmission control module (TCM) has detected a short to ground on the electrical circuit that operates the transmission mount valves. The TCM monitors the voltage on the control wire and flags the code when the signal stays at or near zero volts, indicating the wire is touching ground or the valve solenoid has failed internally.

SystemPowertrain
Code typeVolkswagen specific
SeverityMedium
Fix difficultyIntermediate
AreaVehicle speed, idle control and auxiliary inputs

Symptoms you may notice

  • Illuminated check engine light or transmission warning light, often with no other symptoms
  • Harsh or delayed gear engagement, especially when shifting from park to drive or reverse
  • Increased vibration or driveline harshness felt through the floor and steering wheel
  • Transmission may enter limp mode with reduced gear selection on some models
  • Rough or clunky downshifts during deceleration
  • In rare cases, the engine may stumble or idle poorly if the short affects shared ground circuits

Common causes, most likely first

  1. Chafed or pinched valve control wire shorting to the chassis or transmission housing
  2. Failed transmission mount valve solenoid with an internal short to ground
  3. Corroded or water-intruded connector at the transmission mount valve
  4. Damaged wiring harness near the transmission mount, often from road debris or mount movement
  5. Faulty transmission control module (TCM) driver circuit internally shorted
  6. Poor ground connection at the transmission mount or chassis ground point

How to diagnose and fix it

  1. Scan all modules and record freeze-frame data to confirm P1584 is active and not a stored history code
  2. Visually inspect the transmission mount valve connector and wiring for chafing, corrosion, or moisture intrusion
  3. Disconnect the valve connector and measure resistance from the control wire to ground to check for a short
  4. Check the valve solenoid resistance against the manufacturer specification to rule out an internal short
  5. Wiggle-test the harness while monitoring live data or a multimeter to catch intermittent shorts
  6. Repair or replace the damaged section of wiring and clean or replace the connector as needed
  7. Clear the code and perform a road test to verify the repair and confirm the code does not return

What a short to ground really means here

  • A short to ground on this circuit often comes from the harness rubbing against the transmission mount bracket, not from the valve itself, so inspect the loom before condemning the solenoid.
  • The transmission mount valves are controlled by the TCM and share ground paths with other driveline components, so a bad chassis ground can set P1584 even when the valve circuit tests good.
  • On some Volkswagen models the mount valve is only active during certain driving conditions, so the code may set intermittently and not reappear during a short test drive.
  • A failed transmission mount valve can cause vibrations that mimic engine misfires or worn engine mounts, leading to unnecessary replacement of those parts.
  • After repairing the wiring, the TCM may need a basic setting or adaptation reset on some models before the code will clear permanently.

Can I keep driving with P1584?

You can usually drive the vehicle short distances to a repair shop, but avoid aggressive acceleration or heavy load because the transmission mount may not dampen properly. If the transmission enters limp mode or shifting becomes severely harsh, stop driving and arrange a tow.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

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

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