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Engine-Codes – GMC – P0405 2016 GMC Sierra

P0405 2016 GMC Sierra Code - Exhaust Gas Recirculation Position Sensor Circuit Low Voltage

Quick Answer

The P0405 diagnostic trouble code for a 2016 GMC Sierra indicates an issue with the Exhaust Gas Recirculation (EGR) Position Sensor Circuit, specifically detecting low voltage. Common causes include Faulty EGR Position Sensor, Wiring or connector issues in the EGR circuit, Carbon buildup in the EGR system affecting sensor operation. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means
P0405 2016 GMC Sierra indicates Exhaust Gas Recirculation Position Sensor Circuit Low Voltage.
Common causes
Common causes include Faulty EGR Position Sensor, Wiring or connector issues in the EGR circuit, Carbon buildup in the EGR system affecting sensor operation.
Severity
Moderate - service should be scheduled soon.
Can I drive?
The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code P0405 2016 GMC Sierra Description

The P0405 diagnostic trouble code for a 2016 GMC Sierra indicates an issue with the Exhaust Gas Recirculation (EGR) Position Sensor Circuit, specifically detecting low voltage. The EGR system plays a crucial role in reducing nitrogen oxide emissions by recirculating a portion of the engine's exhaust gases back into the intake manifold. The position sensor is responsible for monitoring the EGR valve's position and ensuring that it opens and closes at the correct times to control exhaust gas flow.

OBDII Code P0405 2016 GMC Sierra - Exhaust Gas Recirculation Position Sensor Circuit Low Voltage
P0405 2016 GMC Sierra Code - Exhaust Gas Recirculation Position Sensor Circuit Low Voltage

Common Causes of P0405 2016 GMC Sierra

  1. Faulty EGR Position Sensor.
  2. Wiring or connector issues in the EGR circuit.
  3. Carbon buildup in the EGR system affecting sensor operation.
  4. EGR valve stuck open or closed.
  5. ECM (Engine Control Module) malfunction.

Symptoms of P0405 2016 GMC Sierra

  1. Check Engine Light illuminated on the dashboard.
  2. Reduced fuel efficiency.
  3. Rough idle or engine hesitation.
  4. Increased emissions output.
  5. Engine knocking or pinging noises.

How to Fix P0405 2016 GMC Sierra

  1. Begin by conducting a visual inspection of the EGR system components, including the sensor, wiring, and valve, to check for any obvious signs of damage or corrosion.
  2. Use a multimeter to test the EGR Position Sensor for proper voltage output, comparing the readings to manufacturer specifications.
  3. Inspect and clean the EGR valve to remove any carbon deposits or debris that may be affecting its operation.
  4. If necessary, replace the EGR Position Sensor or EGR valve with OEM parts to ensure proper functioning.
  5. Clear the diagnostic trouble codes using a scan tool and perform a test drive to verify that the issue has been resolved.

Cost to Fix P0405 2016 GMC Sierra

The cost of repairing a P0405 code on a 2016 GMC Sierra can vary depending on the extent of the issue and the specific parts needed. On average, the parts for this repair, such as a new EGR Position Sensor or EGR valve, can range from $100 to $300. Labor costs at an auto repair shop may add another $100 to $200 to the total bill. Keep in mind that diagnostic time and labor rates can fluctuate based on location and shop rates, so it's advisable to obtain quotes from local service providers for a more accurate estimate.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0405 2016 GMC Sierra Code

1. What does the OBDII code P0405 mean for a 2016 GMC Sierra?

P0405 indicates that the Exhaust Gas Recirculation (EGR) Position Sensor Circuit is reading a voltage lower than the expected range.

2. What are the common symptoms of code P0405 in a 2016 GMC Sierra?

Symptoms may include a check engine light, reduced engine performance, rough idling, increased fuel consumption, or engine hesitation during acceleration.

3. What causes the P0405 code to appear in my GMC Sierra?

Possible causes include a faulty EGR position sensor, damaged wiring or connectors in the EGR circuit, carbon buildup in the EGR valve, or a malfunctioning EGR valve.

4. Can I still drive my 2016 GMC Sierra with a P0405 code?

While the vehicle may still be drivable, ignoring the code can lead to reduced performance, increased emissions, and potential damage to the engine or catalytic converter over time.

5. How do I diagnose the P0405 code on my GMC Sierra?

Diagnosis involves checking the EGR position sensor with a multimeter, inspecting the wiring and connectors for damage, and testing the EGR valve for proper operation.

6. Is the P0405 code related to carbon buildup in the EGR system?

Yes, excessive carbon buildup can restrict the EGR valve's movement, leading to incorrect position sensor readings and triggering the P0405 code.

7. How can I fix the P0405 code on my 2016 GMC Sierra?

Repairs may include cleaning or replacing the EGR valve, replacing the EGR position sensor, repairing damaged wiring, or clearing carbon buildup in the intake system.

8. How much does it cost to repair the P0405 code on a GMC Sierra?

Costs vary, but replacing the EGR position sensor typically ranges from $150 to $400, including parts and labor. Cleaning the EGR valve may be less expensive.

9. Can a faulty EGR position sensor cause long-term damage to my GMC Sierra?

Yes, a faulty sensor can lead to improper EGR operation, increased emissions, and potential engine or catalytic converter damage over time.

10. Will clearing the P0405 code with a scanner fix the issue permanently?

No, clearing the code without addressing the underlying problem will only reset the check engine light temporarily. The code will return if the issue persists.

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