AutoCodes – Generic – P10A4

P10A4 Code - Intake Air Regulating Flap Mechanical Malfunction

Quick Answer

The Engine Control Module (ECM) has detected that the intake air regulating flap is not operating as commanded. Common causes include Faulty intake air regulating flap actuator, Sticking or binding intake air regulating flap, Carbon buildup in the intake system. 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: P10A4 indicates Intake Air Regulating Flap Mechanical Malfunction.
Common causes: Common causes include Faulty intake air regulating flap actuator, Sticking or binding intake air regulating flap, Carbon buildup in the intake system.
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 56

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 03, 2026

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P10A4 Description

The Engine Control Module (ECM) has detected that the intake air regulating flap is not operating as commanded. The intake air regulating flap is used to control airflow through the intake system and improve engine performance and efficiency. The ECM sets the code when the actual flap position does not match the commanded position, indicating a mechanical restriction or actuator fault. On certain Volkswagen and Audi engines equipped with a supercharger, this code may be related to the supercharger regulating flap or bypass valve system.

OBDII Code P10A4 - Intake Air Regulating Flap Mechanical Malfunction - AutoCodes.com — P10A4 Code - Intake Air Regulating Flap Mechanical Malfunction

What does this mean?

What are the Possible Causes of the DTC P10A4?

Faulty intake air regulating flap actuator
Sticking or binding intake air regulating flap
Carbon buildup in the intake system
Oil contamination of the flap mechanism
Vacuum leak or disconnected vacuum hose
Faulty flap position sensor
Open or shorted wiring harness
Poor electrical connection
Faulty supercharger control valve (equipped models)
Faulty Engine Control Module (ECM)

How to Fix the DTC P10A4?

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 P10A4 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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Information for Specific Makes

P10A4 Audi — Intake Air Regulating Flap Mechanical Malfunction
P10A4 Volkswagen — Intake Air Regulating Flap Mechanical Malfunction

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.