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DTC codes / Volkswagen codes / P1571

P1571 · VolkswagenLeft Engine Mount Solenoid Valve Short To B+

P1571 on a Volkswagen means the engine control module (ECM) has detected a short to battery voltage on the control circuit for the left engine mount solenoid valve, which is the electrically adjustable hydraulic mount that damps engine vibration. The ECM commands the mount to soften or stiffen based on engine speed and load, and it monitors the circuit for abnormal voltage; a short to B+ tells the module that the wire is touching a power source or the 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, often with no other noticeable symptoms
  • Increased vibration or harshness felt through the steering wheel, floorpan, or seats, especially at idle
  • A noticeable clunk or thump from the engine bay when accelerating or decelerating
  • Rough idle quality that may be mistaken for an engine misfire or tuning issue
  • In rare cases, the ECM may enter a fail-safe mode that limits the mount's adjustment, making the ride feel stiffer than normal

Common causes, most likely first

  1. Failed left engine mount solenoid valve, where the internal coil has shorted to its power feed
  2. Chafed or pinched wiring harness between the ECM and the mount, allowing the control wire to contact a battery-positive circuit
  3. Corroded or water-intruded connector at the mount solenoid, bridging pins and creating a short
  4. Internal short inside the ECM driver circuit for the mount valve, though this is less common
  5. Aftermarket or incorrectly routed accessory wiring that has been spliced into the mount circuit
  6. Damage to the mount assembly itself from impact or heat, exposing solenoid wiring

How to diagnose and fix it

  1. Scan all modules and record freeze-frame data to confirm P1571 is active and not a stored history code from a previous repair
  2. Visually inspect the left engine mount solenoid connector and the harness routing for chafing, corrosion, or contact with hot or moving components
  3. Disconnect the solenoid and measure resistance across its terminals, comparing to the manufacturer's specification to rule out an internally shorted coil
  4. With the solenoid disconnected and the key on, measure voltage on the control wire to ground; a reading near battery voltage confirms a short to B+ in the harness
  5. Isolate the circuit by disconnecting the ECM connector and checking for continuity between the control wire and battery-positive circuits to pinpoint the short location
  6. Repair or replace the damaged section of harness, using proper crimp-and-seal splices and restoring the original routing
  7. Clear the fault memory and perform a road test with live data monitoring of the mount solenoid command to verify the repair

What a short to B+ really means here

  • A short to B+ does not always mean the solenoid is defective; a harness rubbed through against a nearby power wire will set the same code and replacing the mount will not fix it.
  • The left engine mount solenoid is often overlooked during routine service, so a failed mount can cause vibrations that owners misattribute to worn spark plugs or a dirty throttle body.
  • On some Volkswagen models the mount solenoid shares a power feed with other engine-bay components, so a fault in that shared circuit can set P1571 alongside unrelated codes.
  • Water ingress into the mount connector after engine washing or heavy rain is a frequent cause that a simple visual inspection can miss if the connector boot looks intact.
  • A technician who clears the code without checking freeze-frame data may miss that the fault only occurs when the engine is cold, pointing to a temperature-related harness issue rather than a failed solenoid.

Can I keep driving with P1571?

The vehicle remains safe to drive because the engine mount is a comfort item and the ECM defaults to a fixed damping strategy, but prolonged driving with a shorted circuit can damage the ECM driver or the mount further. Avoid aggressive acceleration and have the fault diagnosed promptly, especially if vibration becomes severe.

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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