AutoCodes – Chevrolet – P0403 2015 Chevrolet Silverado

P0403 2015 Chevrolet Silverado Code - Exhaust Gas Recirculation Control Circuit

Quick Answer

The Engine Control Module (ECM) supplies the Exhaust Gas Recirculation (EGR) valve with a 5 V reference circuit, a low reference circuit, an H-bridge motor directional control circuit, and a signal circuit. Common causes include Faulty Exhaust Gas Recirculation (EGR) Valve, Exhaust Gas Recirculation Valve harness is open or shorted, Exhaust Gas Recirculation 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 2015 Chevrolet Silverado indicates Exhaust Gas Recirculation Control Circuit.
Common causes: Common causes include Faulty Exhaust Gas Recirculation (EGR) Valve, Exhaust Gas Recirculation Valve harness is open or shorted, Exhaust Gas Recirculation 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.

Save to My Repairs Step-by-Step Diagnostic Guide My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 547

How popular is this code, among other codes? Low

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 19, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P0403 2015 Chevrolet Silverado Description

The Engine Control Module (ECM) supplies the Exhaust Gas Recirculation (EGR) valve with a 5 V reference circuit, a low reference circuit, an H-bridge motor directional control circuit, and a signal circuit. The EGR position sensor provides a signal voltage that changes relative to the EGR position. The EGR position sensor information is transmitted between the EGR valve and the ECM on the signal circuit. The Mass Air Flow (MAF) sensor signal is used by the ECM to detect the proper amount of EGR flow. The ECM will close the EGR valve, then open the EGR valve to 100%. The ECM will then calculate the MAF difference and determine if the proper EGR flow has been detected. The Diagnostic Trouble Code (DTC) will be set when the ECM detects an open on the control circuit for greater than 2.5 s.

OBDII Code P0403 2015 Chevrolet Silverado - Exhaust Gas Recirculation Control Circuit - AutoCodes.com — P0403 2015 Chevrolet Silverado Code - Exhaust Gas Recirculation Control Circuit

What does this mean?

What are the Possible Causes of the DTC P0403 2015 Chevrolet Silverado?

Faulty Exhaust Gas Recirculation (EGR) Valve
Exhaust Gas Recirculation Valve harness is open or shorted
Exhaust Gas Recirculation Valve circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0403 2015 Chevrolet Silverado?

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 2015 Chevrolet Silverado 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 P0403 2015 Chevrolet Silverado code?

Need more information on how to fix the P0403 2015 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0403 2015 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area

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 2015 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P0403 in a 2015 Chevrolet Silverado?

- Common symptoms include a check engine light illumination, reduced engine performance, rough idling, and increased fuel consumption.

2. What does OBDII code P0403 indicate in a 2015 Chevrolet Silverado?

- OBDII code P0403 indicates a malfunction in the Exhaust Gas Recirculation (EGR) control circuit of the vehicle.

3. What are the possible causes of OBDII code P0403 in a 2015 Chevrolet Silverado?

- Possible causes include a faulty EGR valve, clogged EGR passages, wiring issues in the EGR system, or a malfunctioning EGR position sensor.

4. How can I diagnose the cause of OBDII code P0403 in my 2015 Chevrolet Silverado?

- Diagnosis typically involves checking the EGR valve for proper operation, inspecting EGR passages for blockages, testing the EGR position sensor, and examining the wiring for any faults.

5. Can I continue driving my 2015 Chevrolet Silverado with OBDII code P0403?

- It is not recommended to drive the vehicle with an unresolved P0403 code, as it can lead to further damage and decreased fuel efficiency.

6. How can I repair OBDII code P0403 in a 2015 Chevrolet Silverado?

- Repair options may include cleaning or replacing the EGR valve, clearing out any clogged EGR passages, repairing or replacing damaged wiring, or replacing the EGR position sensor.

7. Will resetting the OBDII code P0403 in my 2015 Chevrolet Silverado fix the issue?

- Resetting the code may temporarily turn off the check engine light, but without addressing the root cause of the problem, the code is likely to reappear.

8. Are there any preventive maintenance tips to avoid OBDII code P0403 in a 2015 Chevrolet Silverado?

- Regular maintenance, such as cleaning the EGR system components and using high-quality fuel, can help prevent issues leading to code P0403.

9. How long does it typically take to repair OBDII code P0403 in a 2015 Chevrolet Silverado?

- The repair time can vary depending on the exact cause of the code, but it may take anywhere from 1 to 4 hours to diagnose and fix the issue.

10. Can a DIY enthusiast with basic automotive knowledge repair OBDII code P0403 in a 2015 Chevrolet Silverado?

- Depending on the specific cause, some DIY enthusiasts may be able to address code P0403 themselves, especially if it involves tasks like cleaning the EGR valve or inspecting wiring connections. However, more complex issues may require professional assistance.