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P1086 Subaru Code - Tumble Generated Valve Position Circuit Low Sensor 2

- Code Popularity: 21,194 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC P1086 Subaru?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Tumble Generator Position Sensor
  • Tumble Generator Position Sensor harness is open or shorted
  • Tumble Generator Position Sensor circuit poor electrical connection
  • Faulty Tumble Generator Valve
  • Faulty Engine Control Module (ECM)
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How to Fix the DTC P1086 Subaru?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1086 Subaru code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

Code P1086 Subaru Description

The tumble generator system uses an electronically controlled butterfly valve in each intake runner port. At cold idle, the tumble generator system will redirect the air charge through a different port. These ports have a finish characteristic that causes the air/fuel mixture to swirl and tumble greatly and create better combustion. This results in greater idle quality, cleaner emissions, and easier cold-starts.
Once the vehicle warms up, the tumble generator system will be deactivated and the intake air charge will be directed through the standard intake ports.
The tumble generator sensor is responsible for measuring the position of the tumble generator butterfly valves. As the butterfly valves are opened or closed, signal voltage will vary accordingly at the position sensor.
The Diagnostic Trouble Code (DTC) will set when the ECM detects a low voltage signal from the tumble generator valve position sensor.

OBDII Code P1086 Subaru - Tumble Generated Valve Position Circuit Low Sensor 2 - AutoCodes.com
P1086 Subaru Code - Tumble Generated Valve Position Circuit Low Sensor 2

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