AutoCodes – Generic – P0519

P0519 Code - Idle Air Control System Performance

Quick Answer

Many factors are considered when controlling the engine idle speed. Common causes include Vacuum leak, Faulty Idle Air Control Valve, Idle Air Control Valve harness is open or shorted. 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: P0519 indicates Idle Air Control System Performance.
Common causes: Common causes include Vacuum leak, Faulty Idle Air Control Valve, Idle Air Control Valve harness is open or shorted.
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 11,773

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 12, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P0519 Description

Many factors are considered when controlling the engine idle speed. Ambient conditions and electric loads are two such considerations. The idle speed can be adjusted by varying the ignition timing, idle speed control valve, throttle valve position, injection timing and quantity, etc.
For vehicles which use an idle speed control valve, there are two common types:
- Air by-pass system, allows additional air to enter the intake manifold by-passing the throttle valve. This works for speed density systems that use a manifold absolute p[pressure sensor to detect load.

- Stepper motor, adjust throttle valve position.

OBDII Code P0519 - Idle Air Control System Performance - AutoCodes.com — P0519 Code - Idle Air Control System Performance

What does this mean?

What are the Possible Causes of the DTC P0519?

Vacuum leak
Faulty Idle Air Control Valve
Idle Air Control Valve harness is open or shorted
Idle Air Control Valve circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0519?

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 P0519 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.

Need more information about the P0519 code?

Need more information on how to fix the P0519 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0519 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P0519 Mazda — Idle Air Control System Performance
P0519 Subaru — Idle Control System 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.