Engine-Codes - Subaru - P1090 SUBARU

P1090 SUBARU - Tumble Generated Valve System 1 Valve Open

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

P1090 SUBARU Possible Causes

  • Faulty Tumble Generator
  • Tumble Generator harness is open or shorted
  • Tumble Generator circuit poor electrical connection

How is the P1090 SUBARU code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

What is the cost to diagnose the P1090 SUBARU code

Labor: 1.0

The cost to diagnose the P1090 SUBARU code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.
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Possible Symptoms

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

P1090 SUBARU Meaning

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 Diagnostic Trouble Code (DTC) will set when the tumble generator valve is detected open when the desired position is closed.

More Information

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