AutoCodes – Generic – P0403

P0403 Code - Exhaust Gas Recirculation Circuit Malfunction

Quick Answer

Early Exhaust Gas Recirculation (EGR) systems component s include and EGR Valve, and Engine Control Îœodule (ECÎœ) Controlled Vacuum Switch Valve or EGR Solenoid and an EGR Vacuum Îœodulator. Common causes include Faulty EGR volume control solenoid valve, EGR volume control solenoid valve harness is open or shorted, EGR volume control solenoid valve circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: P0403 indicates Exhaust Gas Recirculation Circuit Malfunction.
Common causes: Common causes include Faulty EGR volume control solenoid valve, EGR volume control solenoid valve harness is open or shorted, EGR volume control solenoid valve circuit poor electrical connection.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 113,288

How popular is this code, among other codes? Medium

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P0403 Description

Early Exhaust Gas Recirculation (EGR) systems component s include and EGR Valve, and Engine Control Îœodule (ECÎœ) Controlled Vacuum Switch Valve or EGR Solenoid and an EGR Vacuum Îœodulator. Depending on the engine and driving conditions, the ECÎœ will control the EGR Solenoid which will operate the EGR Vacuum Îœodulator to regulate the opening and closing of the EGR Valve.
The EGR system on recently built vehicles uses a step motor to control the flow rate of EGR from exhaust manifold. This motor has four winding phases. It operates according to the output pulse signal of the ECÎœ. Two windings are turned ON and OFF in sequence. Each time an ON pulse is issued, the valve opens or closes, changing the flow rate. When no change in the flow rate is needed, the ECÎœ does not issue the pulse signal. Î‘ certain voltage signal is issued so that the valve remains at that particular opening.

OBDII Code P0403 - Exhaust Gas Recirculation Circuit Malfunction - AutoCodes.com — P0403 Code - Exhaust Gas Recirculation Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC P0403?

Faulty EGR volume control solenoid valve
EGR volume control solenoid valve harness is open or shorted
EGR volume control solenoid valve circuit poor electrical connection
EGR temperature sensor and circuit

How to Fix the DTC P0403?

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 P0403 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

P0403 Audi — Exhaust Gas Recirculation Control Circuit
P0403 Buick — Exhaust Gas Recirculation Control Circuit
P0403 Cadillac — Exhaust Gas Recirculation Control Circuit
P0403 Chevrolet — Exhaust Gas Recirculation Control Circuit
P0403 Chrysler — Exhaust Gas Recirculation Control Circuit Open
P0403 Dodge — Exhaust Gas Recirculation Control Circuit Open
P0403 Ford — Exhaust Gas Recirculation Control Circuit
P0403 GMC — Exhaust Gas Recirculation Control Circuit
P0403 Infiniti — Exhaust Gas Recirculation Volume Control Valve Circuit
P0403 Isuzu — Exhaust Gas Recirculation Solenoid Control Circuit
P0403 Jeep — Exhaust Gas Recirculation Control Circuit Open
P0403 Lincoln — Exhaust Gas Recirculation Control Circuit
P0403 Mazda — Exhaust Gas Recirculation Valve Stepper Motor Circuit Malfunction
P0403 Mercedes-Benz — Exhaust Gas Recirculation Circuit Malfunction
P0403 Mercury — Exhaust Gas Recirculation Control Circuit
P0403 Mitsubishi — Exhaust Gas Recirculation Control Circuit
P0403 Nissan — Exhaust Gas Recirculation Volume Control Valve Circuit
P0403 Pontiac — Exhaust Gas Recirculation Control Circuit
P0403 Saturn — Exhaust Gas Recirculation Control Circuit
P0403 Volkswagen — Exhaust Gas Recirculation Control Circuit

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 P0403 Code

No Frequently Asked Questions about P0403 Code found.

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Erikamidy
Date: July 20, 2011 at 1:32 pm

I took my car to AutoZone and got a check Engine light diagnostic and my EGR Valve and O2 Sensors bank 1 and bank 2 came up. I just got my o2 sensors replaced and got my EGR VAKVE cleaned out and my check Engine Light is Still on and I took my car back to Auto ZOne for another diagnostic and the same things still came up and i need my emissions done and my light will not go off, What do I need to do?

Reply to Comment
Melbin P
Date: January 6, 2012 at 4:52 am

hi, if the code than you have is the p0403, all you have to do is replace the EGR volume control unit and that seat, but remember the best idea is bring you car to a good mechanic en save money

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latin auto service
Date: August 21, 2013 at 2:46 pm

the common cause of this problem its the solenoid, although its not a bad idea to replace both components since they are so inexpensive. (the solenoid $38.00 and the regulator $32.00 at the dealer) remember its a good practice to check your components before replacing them to avoid unnecessary parts installation. the solenoid you can check resistance and the regulator check for vacuum pressure holding.

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