P0406 OBD Error Code: Problem & Solutions

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P0406 is a general ODB2 trouble code which would indicate that there is a default within the exhaust gas recirculation EGR circuit. This trouble code is similar to P0400, P0401, P0402, P0403, P0404, P0405, P0407, P0408, P0409.

The P0406 error code can be identified as Exhaust Gas Recirculation Sensor "A" Circuit High.

The error code P0406 would mean that there is a high circuit voltage in the exhaust gas recirculation (EGR) sensor A. This high voltage would be detected by the ECU and then it would start indicating the check engine light. The check engine light would start appearing on the dashboard.

What causes this problem with the Exhaust Gas Recirculation Sensor "A" Circuit High?

• Leakage in the vacuum line to EGR valve
• Issue of EGR sensor signal circuit shorted to B+ (battery voltage)
• Defects in the EGR valve
• Bad electrical connection
• EGR sensor signal circuit might be shorted to the 5-volt reference circuit to EGR
• There can be a lot of carbon build-up
• The wiring harness might be opened or shorted
• Some internal failure on EGR sensor or solenoid
• Debris might get caught in valve

1. Crankshaft Position Sensor - A faulty Crankshaft Position Sensor can be troublesome. You can always rely on us as we have best auto parts for our customers.
2. Engine Control Module - If everything is alright with Crankshaft Position Sensor, then there is surely some defect in Engine Control Module. Get it replaced before the situation gets worse.
3. Fuel Pressure Regulator - P0406 code can display due to some issues in the Fuel Pressure Regulator. So, it is very important to replace the Fuel Pressure Regulator with us at equitable prices.
4. EGR Valve Gasket - Do you remember when was the last time you got your car EGR Valve Gasket checked up? A faulty EGR Valve Gasket can cause a lot of issues like displaying P0406 code.
5. Powertrain Control Module - There can be some issues with the Powertrain Control Module due to which you may see P0406 code appearing over and over again. Visit us to buy best quality PCM online.
6. Air Intake temperature Sensor - Are you facing some faults in your Air Intake temperature Sensor? Don’t worry and get them replaced or else P0406 code can turn up.
7. Engine Coolant Temperature Sensor - Common cause behind this P0406 error code can be some fault in Engine Coolant Temperature Sensor. So, it will be a good decision to replace them now.

It is vital to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P0406 here:

Common Symptoms

• There can be a possible surging while driving
• Issue of intermittent stall
• The combustion temperatures and NOx emissions can start increasing
• Flashing up of the malfunction indicator lamp

Looking out for some ways with the help of which you can correct this fault code? Then you have arrived at the correct place. We are here to help you out, so you must check out the steps mentioned below as follows:

• The bad electrical connections should be repaired
• Restore the vacuum line
• The EGR valve should be replaced
• Repairing or replacing wiring harness as needed
• It is very important to clean excessive carbon build-up

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Here are some steps which you should follow in order to diagnose this fault code:

• You must use a scan tool to check for any history, pending as well as current codes
• The freeze frame data should then be noted down, such as vehicle temperature, run time, and load when the fault occurred
• After that the code should be cleared up
• A test drive should be performed trying to duplicate the conditions from the freeze frame data
• After that you should perform a visual inspection for damaged or worn wiring, broken vacuum lines, and loose electrical connectors
• You can always use a scan tool to view EGR position upon start-up and running and manifold pressure
• Check the EGR valve for carbon build-up causing it to not open and close properly

Common Mistakes When Diagnosing The P0406 Code

It is very important to do proper step by step diagnosis of the P0406 trouble code and at the same time perform all the steps carefully. So be sure that you do not overlook the real issue and do the repairs as per the requirement