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Engine-Codes – Generic – P1406

P1406 Code - Exhaust Gas Recirculation Position Sensor Performance

Quick Answer

The P1406 diagnostic trouble code (DTC) indicates a problem with the Exhaust Gas Recirculation (EGR) system's position sensor performance. Common causes include Failed EGR position sensor, Wiring or connector issues in the EGR system, Carbon buildup in the EGR valve or passages. 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
P1406 indicates Exhaust Gas Recirculation Position Sensor Performance.
Common causes
Common causes include Failed EGR position sensor, Wiring or connector issues in the EGR system, Carbon buildup in the EGR valve or passages.
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 05, 2024
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Code P1406 Description

The P1406 diagnostic trouble code (DTC) indicates a problem with the Exhaust Gas Recirculation (EGR) system's position sensor performance. The EGR system is responsible for recirculating a portion of the exhaust gases back into the engine's intake manifold to reduce harmful emissions and control combustion temperatures. The position sensor monitors the EGR valve's position, ensuring that the correct amount of exhaust gas is being recirculated.

OBDII Code P1406 - Exhaust Gas Recirculation Position Sensor Performance
P1406 Code - Exhaust Gas Recirculation Position Sensor Performance

Common Causes of P1406

  1. Failed EGR position sensor
  2. Wiring or connector issues in the EGR system
  3. Carbon buildup in the EGR valve or passages
  4. Vacuum leaks in the EGR system
  5. ECM communication errors with the EGR position sensor

Symptoms of P1406

  1. Check engine light illuminated
  2. Decreased fuel efficiency
  3. Rough idling or engine vibrations
  4. Hesitation or stalling during acceleration
  5. Increased emissions output

How to Fix P1406

  1. Diagnose the EGR system using a scan tool to pinpoint the exact cause of the issue.
  2. Inspect the EGR position sensor, wiring, and connectors for any signs of damage or corrosion.
  3. Clean the EGR valve and passages to remove any carbon buildup that may be affecting its operation.
  4. Test the EGR position sensor's functionality and replace it if necessary.
  5. Clear the DTC and reset the ECM to see if the issue persists after the repair.

Cost to Fix P1406

The cost of repairing a P1406 code can vary depending on the specific cause of the issue and the vehicle's make and model. On average, the parts for this repair can range from $50 to $200, while labor costs can add an additional $100 to $200. Overall, the total repair cost may fall between $150 and $400. It's recommended to consult with a trusted mechanic or auto repair shop to get an accurate estimate based on your vehicle's specific needs.

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Code P1406 Information for Specific Makes

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.

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