P0406 GMC 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 GMC 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 GMC Description
What are the Possible Causes of the DTC P0406 GMC?
- 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 GMC?
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 GMC 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 GMC code?
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Information for Specific GMC Models
- P0406 2014 GMC Sierra — Exhaust Gas Recirculation Position Sensor Circuit High Voltage
- P0406 2015 GMC Sierra — Exhaust Gas Recirculation Position Sensor Circuit High Voltage
- P0406 2016 GMC Sierra — Exhaust Gas Recirculation Position Sensor Circuit High Voltage
- P0406 2017 GMC Sierra — Exhaust Gas Recirculation Position Sensor Circuit High Voltage
- P0406 2018 GMC Sierra — Exhaust Gas Recirculation Position Sensor Circuit High Voltage
Frequently Asked Questions about P0406 GMC Code
1. What are the common symptoms of OBDII code P0406 in a GMC vehicle?
The common symptoms of code P0406 include rough idling, engine stalling, decreased fuel efficiency, and the illumination of the Check Engine Light.
2. What does the OBDII code P0406 in a GMC indicate?
OBDII code P0406 specifically points to an issue with the Exhaust Gas Recirculation (EGR) Position Sensor Circuit registering high voltage.
3. What are the possible causes of OBDII code P0406 in a GMC?
The possible causes of code P0406 include a faulty EGR valve, a malfunctioning EGR position sensor, wiring issues in the EGR circuit, or a problem with the EGR control module.
4. How can I diagnose the issue related to OBDII code P0406 in my GMC?
To diagnose the problem related to code P0406, you can use a diagnostic scanner to retrieve the trouble codes and further inspect the EGR system components for any signs of damage or malfunction.
5. Is it safe to continue driving my GMC with OBDII code P0406 present?
It is not recommended to continue driving your GMC with code P0406 present, as it can lead to further damage to the engine and emissions system. It is best to address the issue promptly.
6. Can I reset the Check Engine Light after fixing the problem related to code P0406 in my GMC?
Once the underlying issue causing code P0406 is fixed, you can reset the Check Engine Light using an OBDII scanner to clear the trouble code and turn off the warning indicator.
7. How much does it typically cost to repair OBDII code P0406 in a GMC?
The cost of repairing code P0406 in a GMC can vary depending on the specific cause of the issue, but it may range from $150 to $500, including parts and labor.
8. Are there any DIY repair tips for addressing OBDII code P0406 in a GMC?
While some minor EGR system checks can be done by DIY enthusiasts, it is recommended to consult a professional mechanic for diagnosing and repairing code P0406 to ensure a proper fix.
9. Can a clogged EGR valve be a potential cause of OBDII code P0406 in a GMC?
Yes, a clogged EGR valve can restrict proper EGR operation and lead to high voltage readings in the EGR Position Sensor Circuit, triggering code P0406 in a GMC.
10. How important is it to address OBDII code P0406 promptly in a GMC vehicle?
It is crucial to address code P0406 promptly in a GMC to prevent potential engine performance issues, reduced fuel efficiency, and to ensure compliance with emissions regulations.
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