AutoCodes – Volkswagen – P3138 Volkswagen

P3138 Volkswagen Code - Intake Flap For Airflow Control Control Difference

Quick Answer

Manufacturers can use a variable geometry intake manifold to alter airflow into the manifold under certain conditions. Common causes include Faulty Intake Manifold Runner Position Sensor, Intake Manifold Runner Position Sensor harness is open or shorted, Intake Manifold Runner Position Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P3138 Volkswagen indicates Intake Flap For Airflow Control Control Difference.
Common causes: Common causes include Faulty Intake Manifold Runner Position Sensor, Intake Manifold Runner Position Sensor harness is open or shorted, Intake Manifold Runner Position Sensor circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 5,629

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jul 03, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P3138 Volkswagen Description

Manufacturers can use a variable geometry intake manifold to alter airflow into the manifold under certain conditions. Under low load conditions, a long thin manifold runner is ideal for flow velocity and swirl/turbulence. Under high load demands, a short think runner is ideal. The rate of intake swirl and turbulence is critical to fuel mixture formation and agitation. A position sensor can be fixed to the control circuit to monitor the valve for both electrical and mechanical faults. An actuator test can be performed to test the circuit and live data or an oscilloscope can be used to validate the position feedback.

OBDII Code P3138 Volkswagen - Intake Flap For Airflow Control Control Difference - AutoCodes.com — P3138 Volkswagen Code - Intake Flap For Airflow Control Control Difference

What does this mean?

What are the Possible Causes of the DTC P3138 Volkswagen?

Faulty Intake Manifold Runner Position Sensor
Intake Manifold Runner Position Sensor harness is open or shorted
Intake Manifold Runner Position Sensor circuit poor electrical connection
Faulty Intake Manifold Runner Control Solenoid Valve

How to Fix the DTC P3138 Volkswagen?

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

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P3138 Volkswagen code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P3138 Volkswagen Code

1. What is OBDII code P3138 on a Volkswagen?

- Code P3138 on a Volkswagen indicates a problem with the Intake Flap for Airflow Control where there is a control difference or discrepancy from expected values.

2. What symptoms might I notice if my Volkswagen has the P3138 code?

- Symptoms can include engine performance issues such as rough idling, reduced fuel efficiency, engine stalling, or hesitation during acceleration.

3. What causes the P3138 code to appear on a Volkswagen?

- Common causes include a faulty intake manifold flap actuator, obstruction or damage in the intake manifold, vacuum leaks, or electrical issues such as faulty wiring or bad connections in the intake flap motor circuit.

4. How can I diagnose the P3138 code in my Volkswagen?

- Diagnosis typically involves using a scan tool to read the fault code and examining the intake flap operation. Checking for physical damage, blockages in the intake manifold, and testing electrical components related to the intake flap motor are also crucial steps.

5. What repairs can fix the P3138 code on a Volkswagen?

- Repairs may include replacing the intake manifold flap actuator, repairing any vacuum leaks, clearing blockages in the manifold, or repairing or replacing damaged wiring or connectors.

6. Is it safe to drive my Volkswagen with the P3138 code active?

- While you might be able to drive with this code active, it is not recommended as it can lead to increased emissions, poor fuel economy, and potential engine damage over time.

7. How urgent is it to address the P3138 code in a Volkswagen?

- It is moderately urgent to address this issue to avoid further engine performance problems and potential damage, especially if symptoms like stalling or rough idling are present.

8. Can the P3138 code affect the fuel economy of my Volkswagen?

- Yes, this code can lead to poorer fuel economy due to the engine not managing air intake efficiently, causing it to run less smoothly and consume more fuel.

9. What tools are required to diagnose and fix the P3138 code?

- Tools needed include a diagnostic scan tool to read and clear codes, a multimeter for electrical testing, and basic hand tools to access and possibly replace components of the intake system.

10. Can a dirty air filter cause the P3138 code on a Volkswagen?

- While a dirty air filter itself is unlikely to trigger this specific code, it can contribute to overall air intake issues that exacerbate the underlying problem causing the P3138 code. Regular maintenance is recommended.