P0490 - OBD Trouble Code

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The trouble code P0490 can be defined as Exhaust Gas Recirculation "A" Control Circuit High. If the powertrain control module would detect an extremely high rate of voltage flow within the EGR, then it would start triggering up the P0490 trouble code. This trouble code is related with the P0489 fault code, which would indicate that the voltage within the similar system is abnormally low.

The engine trouble codes refer to the flaws in the exhaust gas recirculation system. An integral part of the vehicles emission system is the EGR whose main motive is to prevent the harmful nitrogen oxides from forming in the cylinders. It is the engine management computer which operates the EGR.

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

• There can be some faults in the EGR sensor
• Quirks in the MAP sensor
• The vacuum line might be broken
• Defective EGR valve
• Some flaws in the EGR solenoid
• There can be some defects in the connectors or electrical wiring

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2. EGR Valve Gasket - A broken EGR Valve Gasket can cause a lot of issues. It would be nice if you get it replaced on time.
3. Oil Pressure Sender - Everything is fine with the engine control module and still OBD code P0490 flashing? Then there is definitely some fault with the Oil Pressure Sender. Get it checked and replace if needed.
4. Intake Manifold Actuator - Intake Manifold Actuator is an important car part which should never be neglected. May be there is some fault in it due to which P0490 code may start flashing.
5. Powertrain Control Module - A faulty Powertrain Control Module can be troublesome. You can always rely on us as we have best auto parts for our customers.
6. Engine Control Module - If everything is alright with PCM, then there is surely some defect in Engine Control Module. Get it replaced before the situation gets worse.

Our main motive is to achieve customer satisfaction as for us our customers are everything and that’s why we will help you to diagnose P0490 code by mentioning some major symptoms below:

Common Symptoms

• The check engine light can start appearing
• There can be some vehicles which might run roughly, or may be difficult to start
• Vehicle owners might experience a decrease in power
• The overall fuel economy might start diminishing

If you wish to correct this fault code, then you have to follow certain steps. Correcting a problem needs your careful attention. Here are some ways with the help of which you will be able to correct the OBD Code P0490:

• If you want to monitor EGR function then you should use a scanner, and manually compare the information to the manufacturer’s specifications
• Carefully remove the EGR valve and if there are any clogs, then they should be cleared up
• Inspect that the computer is working correctly, or if you face some issues then you can always replace it
• You can always check and repair the EGR valve, control solenoid, sensor, or DPFE sensor, as per the requirement
• The vacuum line should then be disconnected, and manually apply vacuum to the EGR valve to observe the operation
• You must test all the connectors and wiring for the PCM, and repair or replace as necessary

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

• In order to diagnose the P0490 code, a technician needs to check the PCM memory with an OBD-II scanner
• Now if the P0490 fault code returns back, then he should inspect the electrical wiring and connectors, to be sure that the issue isn’t being caused by a simple short or disconnected wire
• If any issues in the wiring are addressed, they should then clear the code and retest the system. If the code is still being stored, they will then consider other repair options to address the P0490 code

Common Mistakes When Diagnosing The P0490 Code

• The most common mistake when diagnosing the cause of the P0490 code is to automatically replace the EGR valve
• The people should carefully inspect other components of the system before replacing any part

P0489 - Exhaust Gas Recirculation "A" Control Circuit Low