AutoCodes – Chevrolet – P0405 Chevrolet

P0405 Chevrolet Code - Exhaust Gas Recirculation Position Sensor Circuit Low 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 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: P0405 Chevrolet indicates Exhaust Gas Recirculation Position Sensor Circuit Low 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: 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 41,599

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 Mar 24, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0405 Chevrolet 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 less than 0.25 V for greater than 5 s.

OBDII Code P0405 Chevrolet - Exhaust Gas Recirculation Position Sensor Circuit Low Voltage - AutoCodes.com — P0405 Chevrolet Code - Exhaust Gas Recirculation Position Sensor Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0405 Chevrolet?

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 P0405 Chevrolet?

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 P0405 Chevrolet 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 P0405 Chevrolet code?

Need more information on how to fix the P0405 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0405 Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

P0405 2014 Chevrolet Silverado — Exhaust Gas Recirculation Position Sensor Circuit Low Voltage
P0405 2015 Chevrolet Silverado — Exhaust Gas Recirculation Position Sensor Circuit Low Voltage
P0405 2016 Chevrolet Silverado — Exhaust Gas Recirculation Position Sensor Circuit Low Voltage
P0405 2017 Chevrolet Silverado — Exhaust Gas Recirculation Position Sensor Circuit Low Voltage
P0405 2018 Chevrolet Silverado — Exhaust Gas Recirculation Position Sensor Circuit Low Voltage

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 P0405 Chevrolet Code

1. What are common symptoms of OBDII code P0405 in a Chevrolet?

- Common symptoms include rough idling, engine misfires, decreased fuel efficiency, and the illumination of the Check Engine Light.

2. What does the OBDII code P0405 in a Chevrolet indicate?

- The code P0405 indicates a low voltage condition in the Exhaust Gas Recirculation (EGR) Position Sensor circuit.

3. What are possible causes of OBDII code P0405 in a Chevrolet?

- Possible causes include a faulty EGR Position Sensor, damaged wiring or connectors in the EGR circuit, or a problem with the EGR valve itself.

4. How can I diagnose the issue causing OBDII code P0405 in my Chevrolet?

- Diagnosing the issue may involve visually inspecting the EGR system components, testing the EGR Position Sensor with a multimeter, and checking for any loose connections in the circuit.

5. Can I continue driving my Chevrolet with OBDII code P0405 present?

- It is not recommended to continue driving with the code present, as it can lead to further engine damage and reduced performance if left unresolved.

6. How can I repair OBDII code P0405 in my Chevrolet?

- Repairing the issue may involve replacing the EGR Position Sensor, repairing damaged wiring or connectors, or cleaning/replacing the EGR valve if necessary.

7. Are there any DIY tips for fixing OBDII code P0405 in a Chevrolet?

- DIY tips include ensuring proper connection of EGR system components, checking for vacuum leaks, and following a service manual for specific troubleshooting steps.

8. How much does it typically cost to repair OBDII code P0405 in a Chevrolet?

- Repair costs can vary depending on the exact cause of the issue, but they generally range from $100 to $300 for parts and labor.

9. Can clearing the OBDII code P0405 in a Chevrolet reset the Check Engine Light?

- Clearing the code may temporarily turn off the Check Engine Light, but if the underlying issue is not fixed, the light is likely to come back on after a short period.

10. How can I prevent OBDII code P0405 from reoccurring in my Chevrolet?

- Regular maintenance, such as cleaning the EGR system components and ensuring proper connections, can help prevent the recurrence of OBDII code P0405 in your Chevrolet.