P0403 Infiniti Code - Exhaust Gas Recirculation Volume Control Valve Circuit
Quick Answer
Early Exhaust Gas Recirculation (EGR) systems component s include and EGR Valve, and Engine Control Μodule (ECΜ) Controlled Vacuum Switch Valve or EGR Solenoid and an EGR Vacuum Μodulator. 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 Infiniti indicates Exhaust Gas Recirculation Volume Control Valve Circuit.
- 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.
Code P0403 Infiniti Description
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 ECΜ. 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 ECΜ does not issue the pulse signal. Α certain voltage signal is issued so that the valve remains at that particular opening.
What are the Possible Causes of the DTC P0403 Infiniti?
- 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 Infiniti?
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 Infiniti 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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Frequently Asked Questions about P0403 Infiniti Code
What does the P0403 code mean for an Infiniti?
The P0403 code indicates an issue with the Exhaust Gas Recirculation (EGR) Volume Control Valve Circuit, which may affect emissions and engine performance.
What are common symptoms of code P0403 in an Infiniti?
Symptoms may include the check engine light turning on, reduced fuel efficiency, rough idle, or engine hesitation during acceleration.
What causes the P0403 code to appear on an Infiniti?
Common causes include a faulty EGR control valve, damaged wiring or connectors in the EGR circuit, or issues with the powertrain control module (PCM).
Can I drive my Infiniti if the P0403 code is active?
While the vehicle may still be drivable, ignoring the code can lead to increased emissions and potential engine performance issues over time.
How can I diagnose the P0403 code on my Infiniti?
You can diagnose this code by using an OBD-II scanner to read the error, inspecting the EGR valve and its wiring for damage, and testing the electrical connections for continuity.
What repairs are typically needed to fix the P0403 code?
Repairs may include replacing the EGR volume control valve, repairing or replacing damaged wiring, cleaning the EGR system, or reprogramming the PCM.
Does the P0403 code affect emissions testing?
Yes, the P0403 code can cause your Infiniti to fail emissions testing due to improper EGR function leading to higher pollutant output.
How much does it cost to fix the P0403 code on an Infiniti?
The cost depends on the specific repair, but replacing the EGR valve can range from $150 to $400, while wiring repairs might cost less.
Can a dirty EGR valve trigger the P0403 code?
Yes, a dirty or clogged EGR valve can restrict airflow and lead to circuit-related errors like the P0403 code.
How can I prevent the P0403 code from occurring again?
Regularly maintaining the EGR system, inspecting wiring, and using high-quality fuel can help prevent the recurrence of this code.
Discuss the causes and fixes for P0403 Infiniti OBDII Code
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