AutoCodes – Chevrolet – P0406 2017 Chevrolet Silverado

P0406 2017 Chevrolet Silverado Code - Exhaust Gas Recirculation Position Sensor Circuit High Voltage

Quick Answer

The Engine Control Module (ECM) uses the Exhaust Gas Recirculation (EGR) position sensor to determine the position of the EGR valve. 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 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: P0406 2017 Chevrolet Silverado indicates Exhaust Gas Recirculation Position Sensor Circuit High Voltage.
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: 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 256

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jun 20, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
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Code P0406 2017 Chevrolet Silverado Description

The Engine Control Module (ECM) uses the Exhaust Gas Recirculation (EGR) position sensor to determine the position of the EGR valve. The ECM sends a reference voltage through the 5 V reference circuit to the EGR position sensor. The ECM provides a voltage return path for the sensor through the low reference circuit. A variable voltage signal, based on the EGR valve position, is sent from the sensor to the ECM through the EGR position sensor signal circuit. The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the EGR position sensor voltage is greater than 4.8 V for greater than 5 s.

OBDII Code P0406 2017 Chevrolet Silverado - Exhaust Gas Recirculation Position Sensor Circuit High Voltage - AutoCodes.com — P0406 2017 Chevrolet Silverado Code - Exhaust Gas Recirculation Position Sensor Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0406 2017 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 P0406 2017 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 P0406 2017 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 P0406 2017 Chevrolet Silverado code?

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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 P0406 2017 Chevrolet Silverado Code

1. What does the OBDII code P0406 mean on a 2017 Chevrolet Silverado?

P0406 indicates a high voltage issue in the Exhaust Gas Recirculation (EGR) Position Sensor Circuit, meaning the EGR sensor is reporting a voltage higher than expected.

2. What are the common symptoms of code P0406 in a 2017 Chevrolet Silverado?

Symptoms may include the Check Engine Light turning on, reduced engine performance, rough idling, increased emissions, or poor fuel economy.

3. What causes the P0406 code to appear in a 2017 Chevrolet Silverado?

Possible causes include a faulty EGR position sensor, wiring issues (such as damaged or corroded connections), a stuck EGR valve, or a malfunctioning EGR control module.

4. Can I drive my 2017 Chevrolet Silverado with a P0406 code?

Itâ€™s possible to drive the vehicle, but it's not recommended. Continuing to drive can lead to reduced performance, higher emissions, and potential damage to the EGR system or other engine components.

5. How do I diagnose the P0406 code on a 2017 Chevrolet Silverado?

Start by using an OBDII scanner to verify the code. Then inspect the EGR position sensor, wiring, and connections for damage or corrosion. A multimeter can be used to test the sensor's voltage readings.

6. How can I fix the P0406 code on a 2017 Chevrolet Silverado?

Repairs may include replacing the EGR position sensor, cleaning or replacing the EGR valve, repairing damaged wiring or connectors, or updating the vehicle's engine control module (ECM) software.

7. How much does it cost to fix the P0406 code on a 2017 Chevrolet Silverado?

Costs vary depending on the issue. Replacing the EGR position sensor typically costs $150â€“$300, including parts and labor.

8. Can a dirty EGR valve cause the P0406 code on a 2017 Chevrolet Silverado?

Yes, a dirty or clogged EGR valve can cause the sensor to report incorrect readings, triggering the P0406 code.

9. What tools are needed to fix the P0406 code on a 2017 Chevrolet Silverado?

Common tools include an OBDII scanner, a multimeter for voltage testing, basic hand tools (screwdrivers, wrenches), and possibly an EGR valve cleaner.

10. How can I prevent the P0406 code from returning on my 2017 Chevrolet Silverado?

Perform regular maintenance, clean the EGR valve periodically, and inspect the EGR system for damage. Address any Check Engine Light issues promptly to avoid further complications.