P0406 2016 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 2016 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.
Code P0406 2016 Chevrolet Silverado Description
What are the Possible Causes of the DTC P0406 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 P0406 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 P0406 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.
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Frequently Asked Questions about P0406 2016 Chevrolet Silverado Code
1. What does the OBDII code P0406 mean for a 2016 Chevrolet Silverado?
P0406 indicates that the Exhaust Gas Recirculation (EGR) Position Sensor Circuit is detecting a voltage that is higher than the expected range.
2. What are the common symptoms of the P0406 code?
Common symptoms include reduced engine performance, rough idling, poor fuel economy, stalling, and the check engine light being illuminated.
3. What causes the P0406 code in a 2016 Chevrolet Silverado?
The most common causes are a faulty EGR position sensor, wiring issues like short circuits, a malfunctioning EGR valve, or carbon buildup in the EGR system.
4. How can I diagnose the P0406 code on my Silverado?
Start by inspecting the EGR valve and position sensor for damage or carbon buildup. Then check the wiring and connectors for fraying, corrosion, or loose connections. Use a multimeter to test sensor voltage.
5. Can I drive my Silverado with the P0406 code?
While the truck may still be drivable, it can lead to poor performance and damage to the emissions system over time. It's best to address the issue promptly.
6. How do I fix the P0406 code on a 2016 Chevrolet Silverado?
Repairs may include cleaning or replacing the EGR valve, replacing the EGR position sensor, repairing or replacing damaged wiring, or clearing carbon buildup in the EGR system.
7. How much does it cost to fix the P0406 code?
The cost can vary, but replacing the EGR valve or sensor typically ranges from $150 to $400, depending on parts and labor rates.
8. Can a dirty EGR valve cause the P0406 code?
Yes, carbon buildup in the EGR valve can restrict movement, leading to incorrect sensor readings and triggering the P0406 code.
9. Is the P0406 code covered under warranty for a 2016 Chevrolet Silverado?
It may be covered under the emissions warranty if the vehicle is within the mileage and time limits. Check with your dealer for specific coverage details.
10. Do I need special tools to fix the P0406 code?
Basic tools like a socket set, multimeter, and OBDII scanner can help. In some cases, specialized tools may be required to remove or clean the EGR valve.
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