P1406 – Infiniti DTC

Infiniti DTC P1406 – EGR Valve Pintle Position Circuit

DTC P1406 meaning on Infiniti

DTC P1406 on an Infiniti indicates a fault in the EGR (Exhaust Gas Recirculation) valve pintle position circuit. This code is triggered when the Engine Control Module (ECM) detects an out-of-range signal from the EGR valve position sensor.

Infiniti DTC P1406 symptoms

• Check Engine Light (MIL) illuminated
• Decreased engine performance
• Increased fuel consumption
• Rough idling or stalling

Infiniti DTC P1406 causes

• Faulty EGR valve position sensor
• Wiring or connector issues in the EGR valve circuit
• Carbon buildup in the EGR system
• ECM software or hardware problems

Infiniti DTC P1406 seriousness

The seriousness of DTC P1406 on an Infiniti depends on the underlying cause. Ignoring this issue can lead to poor engine performance, increased emissions, and potential damage to other engine components over time.

How to diagnose DTC P1406 on Infiniti

1. Use a scan tool to retrieve the DTC and freeze frame data
2. Inspect the EGR valve and its wiring for any visible damage
3. Test the EGR valve position sensor using a multimeter
4. Check for carbon buildup in the EGR system
5. Verify the integrity of the EGR valve circuit connections

How to fix DTC P1406 on Infiniti

1. Replace the EGR valve position sensor if faulty
2. Repair or replace damaged wiring or connectors in the EGR circuit
3. Clean the EGR system to remove carbon deposits
4. Update the ECM software if necessary

How to erase DTC P1406 on Infiniti

1. Use a scan tool to clear the DTC and reset the ECM
2. Ensure the underlying issue causing the DTC has been resolved
3. Perform a road test to confirm the repair and check for any recurring codes

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