AutoCodes – Saturn – P0406 Saturn

P0406 Saturn 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 Saturn 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 1,719

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 24, 2024

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0406 Saturn 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 Saturn - Exhaust Gas Recirculation Position Sensor Circuit High Voltage - AutoCodes.com — P0406 Saturn Code - Exhaust Gas Recirculation Position Sensor Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0406 Saturn?

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 Saturn?

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 Saturn 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 Saturn code?

Need more information on how to fix the P0406 Saturn code? Get Access to Factory Service Manuals

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Get the P0406 Saturn 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 P0406 Saturn Code

1. What are the common symptoms of OBDII code P0406 on a Saturn vehicle?

The common symptoms of code P0406 on a Saturn include rough idling, poor fuel economy, engine stalling, and the illumination of the Check Engine Light.

2. What causes the OBDII code P0406 to trigger in a Saturn car?

Code P0406 is triggered on a Saturn when the Exhaust Gas Recirculation (EGR) position sensor circuit detects a high voltage signal, indicating a potential issue with the EGR system.

3. How serious is the OBDII code P0406 on a Saturn vehicle?

While code P0406 may not cause immediate drivability issues, it can lead to poor engine performance, increased emissions, and potential long-term damage if left unresolved.

4. Can a dirty EGR valve cause the OBDII code P0406 on a Saturn?

Yes, a dirty or clogged EGR valve can restrict the flow of exhaust gases and cause the EGR position sensor to detect a high voltage signal, triggering code P0406 on a Saturn.

5. How can I diagnose and repair OBDII code P0406 on my Saturn?

Diagnosing code P0406 involves testing the EGR position sensor, checking the wiring for any faults, and inspecting the EGR valve for blockages. Repair may involve cleaning or replacing the EGR valve or repairing any damaged wiring.

6. Is it safe to continue driving with OBDII code P0406 on a Saturn?

While it may be safe to drive with code P0406 in the short term, it is recommended to address the issue promptly to prevent potential engine performance issues and increased emissions.

7. Can a faulty EGR position sensor cause OBDII code P0406 on a Saturn?

Yes, a faulty EGR position sensor can send incorrect voltage signals to the engine control module, triggering code P0406 on a Saturn.

8. How much does it typically cost to repair OBDII code P0406 on a Saturn?

The cost of repairing code P0406 on a Saturn can vary depending on the specific cause of the issue, but it may range from $100 to $500 for parts and labor.

9. Will resetting the Check Engine Light resolve OBDII code P0406 on a Saturn?

Resetting the Check Engine Light may temporarily turn off the indicator, but it will not fix the underlying issue causing code P0406 on a Saturn. It is recommended to diagnose and repair the problem to prevent further complications.

10. Can a DIY enthusiast fix OBDII code P0406 on a Saturn at home?

Depending on the level of expertise, a DIY enthusiast may be able to diagnose and repair code P0406 on a Saturn by following detailed instructions, using appropriate tools, and safely working on the EGR system.