P0406 2016 GMC Sierra 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 GMC Sierra 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 GMC Sierra Description
What are the Possible Causes of the DTC P0406 2016 GMC Sierra?
- 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 GMC Sierra?
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 GMC Sierra 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 GMC Sierra Code
1. What does the OBDII code P0406 mean on a 2016 GMC Sierra?
P0406 indicates a high voltage issue in the Exhaust Gas Recirculation (EGR) Position Sensor Circuit, suggesting a problem with the sensor or its wiring.
2. What are the common symptoms of code P0406 in a 2016 GMC Sierra?
Symptoms include poor fuel economy, rough idling, reduced engine performance, and the check engine light being illuminated.
3. What causes the P0406 code in a 2016 GMC Sierra?
Common causes include a faulty EGR position sensor, damaged wiring or connections in the EGR circuit, or carbon buildup in the EGR valve.
4. Can I still drive my 2016 GMC Sierra with a P0406 code?
While the truck may still be drivable, ignoring the issue can lead to decreased engine performance and possible long-term damage.
5. How do I diagnose the P0406 code on a 2016 GMC Sierra?
Use an OBDII scanner to confirm the code, visually inspect the EGR sensor and wiring, and test the sensor voltage with a multimeter.
6. How do I fix the P0406 code on my 2016 GMC Sierra?
Potential fixes include cleaning or replacing the EGR valve, repairing damaged wiring, or replacing the EGR position sensor if faulty.
7. How much does it cost to repair the P0406 code on a 2016 GMC Sierra?
Repair costs vary but typically range from $150 to $400, depending on whether cleaning, wiring repair, or sensor replacement is required.
8. Can a dirty EGR valve cause the P0406 code in a 2016 GMC Sierra?
Yes, carbon buildup in the EGR valve can interfere with the sensor and trigger the P0406 code.
9. What tools are needed to fix the P0406 code on a 2016 GMC Sierra?
Basic tools include an OBDII scanner, multimeter, socket set, and possibly a cleaning solution for the EGR valve.
10. Will clearing the P0406 code with a scanner fix the problem?
Clearing the code may temporarily turn off the check engine light, but the underlying issue must be repaired to prevent the code from returning.
Discuss the causes and fixes for P0406 2016 GMC Sierra OBDII Code
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