P0406 Chevrolet 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 Chevrolet 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.
Code P0406 Chevrolet Description
What are the Possible Causes of the DTC P0406 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 P0406 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 P0406 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.
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Information for Specific Chevrolet Models
- P0406 2014 Chevrolet Silverado — Exhaust Gas Recirculation Position Sensor Circuit High Voltage
- P0406 2015 Chevrolet Silverado — Exhaust Gas Recirculation Position Sensor Circuit High Voltage
- P0406 2016 Chevrolet Silverado — Exhaust Gas Recirculation Position Sensor Circuit High Voltage
- P0406 2017 Chevrolet Silverado — Exhaust Gas Recirculation Position Sensor Circuit High Voltage
- P0406 2018 Chevrolet Silverado — Exhaust Gas Recirculation Position Sensor Circuit High Voltage
Frequently Asked Questions about P0406 Chevrolet Code
1. What are common symptoms of OBDII code P0406 on a Chevrolet?
- Common symptoms include rough idling, engine stalling, decreased fuel efficiency, and the illumination of the check engine light.
2. What does the OBDII code P0406 on a Chevrolet indicate?
- The code P0406 indicates a problem with the Exhaust Gas Recirculation (EGR) Position Sensor Circuit registering high voltage.
3. What are potential causes of the P0406 code in a Chevrolet?
- Potential causes can 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 P0406 code on my Chevrolet?
- Diagnosis typically involves using an OBDII scanner to retrieve the code, checking the EGR system for any visible signs of damage, and testing the EGR position sensor and related components for proper functionality.
5. Can I continue driving my Chevrolet with the P0406 code present?
- It is not recommended to continue driving with the P0406 code present, as it can lead to poor engine performance, increased emissions, and potential damage to other components.
6. How can I repair the P0406 code on my Chevrolet?
- Repair options may include replacing the EGR position sensor, repairing or replacing damaged wiring or connectors, or cleaning or replacing the EGR valve if necessary.
7. Are there any DIY tips for fixing the P0406 code on a Chevrolet?
- While some repairs may require professional assistance, DIY enthusiasts can start by checking the EGR system for loose connections, cleaning the EGR valve, and inspecting the wiring for any visible damage.
8. Will resetting the check engine light resolve the P0406 code on a Chevrolet?
- Resetting the check engine light may temporarily turn it off, but it will not fix the underlying issue causing the P0406 code. It is recommended to diagnose and repair the problem to prevent further issues.
9. How long does it typically take to repair the P0406 code on a Chevrolet?
- The repair time can vary depending on the exact cause of the P0406 code. Simple fixes like replacing a sensor or cleaning components may take a few hours, while more complex issues could require more time.
10. Is it necessary to visit a dealership for repairs related to the P0406 code on a Chevrolet?
- While a dealership can provide specialized service, independent mechanics and DIY enthusiasts with the necessary tools and knowledge can also effectively diagnose and repair the P0406 code on a Chevrolet.
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