P0406 2017 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 2017 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 2017 GMC Sierra Description
What are the Possible Causes of the DTC P0406 2017 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 2017 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 2017 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 2017 GMC Sierra Code
1. What does the OBDII code P0406 mean on a 2017 GMC Sierra?
P0406 indicates a high voltage issue in the Exhaust Gas Recirculation (EGR) Position Sensor Circuit, meaning the sensor is reporting a voltage higher than expected.
2. What are the common symptoms of a P0406 code on a 2017 GMC Sierra?
Symptoms may include the Check Engine Light turning on, rough idling, reduced fuel efficiency, hesitation during acceleration, and possibly increased emissions.
3. What causes the P0406 code to appear on a 2017 GMC Sierra?
Common causes include a faulty EGR position sensor, issues with the EGR valve, wiring or connector problems in the EGR circuit, or a malfunctioning PCM (Powertrain Control Module).
4. Can I drive my 2017 GMC Sierra with a P0406 code?
While the truck may still drive, prolonged use can lead to reduced performance, increased emissions, and potential damage to other components, so it’s best to address the issue promptly.
5. How do I diagnose the P0406 code on a 2017 GMC Sierra?
Start by checking the EGR position sensor and its wiring for damage or corrosion, test the sensor’s voltage output with a multimeter, and inspect the EGR valve for proper operation.
6. How do I fix the P0406 code on a 2017 GMC Sierra?
Repairs may include replacing the EGR position sensor, repairing or replacing damaged wiring or connectors, cleaning or replacing the EGR valve, or updating/reprogramming the PCM if necessary.
7. How much does it cost to fix the P0406 code on a 2017 GMC Sierra?
Costs vary depending on the issue, but replacing the EGR position sensor typically ranges from $150 to $300, including parts and labor.
8. Can a dirty EGR valve cause the P0406 code on a 2017 GMC Sierra?
Yes, a dirty or clogged EGR valve can cause position sensor issues or incorrect readings, potentially triggering the P0406 code.
9. How can I prevent the P0406 code from recurring on my 2017 GMC Sierra?
Regular maintenance, such as cleaning the EGR valve and inspecting the EGR system wiring, can help prevent future issues.
10. Does resetting the Check Engine Light fix the P0406 code on a 2017 GMC Sierra?
Resetting the light will clear the code temporarily, but the underlying issue must be diagnosed and repaired to prevent the code from returning.
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