AutoCodes – Chevrolet – P0403 2016 Chevrolet Silverado

P0403 2016 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 2016 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.

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Code Popularity 355

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
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Code P0403 2016 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 2016 Chevrolet Silverado - Exhaust Gas Recirculation Control Circuit - AutoCodes.com — P0403 2016 Chevrolet Silverado Code - Exhaust Gas Recirculation Control Circuit

What does this mean?

What are the Possible Causes of the DTC P0403 2016 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 2016 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 2016 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 2016 Chevrolet Silverado code?

Need more information on how to fix the P0403 2016 Chevrolet Silverado code? Get Access to Factory Service Manuals

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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 2016 Chevrolet Silverado Code

1. What are common symptoms of OBDII code P0403 in a 2016 Chevrolet Silverado?

The common symptoms of code P0403 in a 2016 Chevrolet Silverado include rough idling, decreased fuel efficiency, and the illumination of the check engine light.

2. What does OBDII code P0403 indicate in a 2016 Chevrolet Silverado?

Code P0403 on a 2016 Chevrolet Silverado specifically points to an issue with the Exhaust Gas Recirculation (EGR) control circuit.

3. What are the possible causes of OBDII code P0403 in a 2016 Chevrolet Silverado?

Potential causes of code P0403 in a 2016 Chevrolet Silverado include a faulty EGR valve, damaged wiring or connectors in the EGR circuit, or a malfunctioning EGR position sensor.

4. How can I diagnose the OBDII code P0403 in my 2016 Chevrolet Silverado?

To diagnose code P0403, you can perform a visual inspection of the EGR system components, check the wiring and connectors for any damage, and use a diagnostic scanner to monitor EGR valve operation.

5. Can I continue driving my 2016 Chevrolet Silverado with OBDII code P0403?

While the vehicle may still operate with code P0403, it is recommended to address the issue promptly to prevent potential damage to the engine or emissions system.

6. Is it safe to clear the OBDII code P0403 in a 2016 Chevrolet Silverado and see if it returns?

Clearing the code without addressing the underlying issue is not recommended, as the problem may persist and potentially lead to more severe issues down the line.

7. How can I repair OBDII code P0403 in my 2016 Chevrolet Silverado?

Repairing code P0403 may involve replacing the EGR valve, repairing damaged wiring or connectors, or replacing the EGR position sensor, depending on the specific cause of the issue.

8. Can a dirty EGR system cause OBDII code P0403 in a 2016 Chevrolet Silverado?

Yes, a dirty EGR system can contribute to the occurrence of code P0403 in a 2016 Chevrolet Silverado, as it can affect the proper functioning of the EGR valve and related components.

9. Will a faulty EGR valve always trigger OBDII code P0403 in a 2016 Chevrolet Silverado?

While a faulty EGR valve is a common cause of code P0403, other issues such as wiring faults or sensor malfunctions can also trigger the code in a 2016 Chevrolet Silverado.

10. How important is it to address OBDII code P0403 promptly in a 2016 Chevrolet Silverado?

It is essential to address code P0403 promptly in a 2016 Chevrolet Silverado to ensure proper engine performance, fuel efficiency, and compliance with emissions regulations.