Guide To P0403 OBD Error Code Solutions

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The error code P0403 would start indicating that a malfunction has been detected in the exhaust gas recirculation (EGR) circuit by the engine control module.  There has been a short or open circuit in the EGR vacuum control solenoid or wiring to the solenoid detected by the engine control module.

Want to learn something more about this fault code?

This diagnostic fault code is a generic powertrain code, which means that it would apply to the OBD-II equipped vehicles. The specific repair steps can vary as it depends upon the vehicle make and model.

What causes this problem with the Exhaust Gas Recirculation Circuit Malfunction?

• There can be bad connection at the EGR solenoid harness
• There can be loss of supply voltage to EGR solenoid
• Malfunction in the powertrain control module
• Issue of water intrusion at the EGR solenoid harness
• Defects in the EGR solenoid
• There can be a lot of resistance in control circuit due to an open, chafing or damage to the harness
• The EGR control solenoid might be blocked

1. MAP Sensor - There can be some issues with the MAP Sensor due to which you may see P0403 code appearing over and over again. Visit us to buy best quality MAP Sensor online.
2. EGR Valve Gasket - A lot of issues can arise do to defective EGR Valve Gasket. Did you just see P0403 code flashing? Now you know the reason why it is appearing. Get it inspected and replaced on time.
3. Mass Air Flow Sensor - Faulty Mass Air Flow Sensor can be the reason why P0403 code is flashing. Visit us to purchase top notch Mass Air Flow Sensor online.
4. Oil Pressure Sender - It is an important auto part which needs full care. A faulty Oil Pressure Sender can be a reason behind the flashing up of P0403 code.
5. Catalytic Converter - OBD Code P0403 can appear because of faulty Catalytic Converter.
6. Crankshaft Position Sensor - There can be some issues with the Crankshaft Position Sensor due to which you may see P0403 code appearing over and over again. Visit us to buy best quality Crankshaft Position Sensor online.
7. Engine Coolant Temperature Sensor - Are you facing some faults in your Engine Coolant Temperature Sensor? Don’t worry and get them replaced or else P0403 code can turn up.

You might be thinking that how would you diagnose these problems? We at Parts Avatar Canada would help you diagnose the major symptoms easily.

Common Symptoms

• The engine might have pre-ignition on acceleration
• Check engine light can start flashing
• The engine EGR system might be disabled by the engine control module

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 corroded connector to the EGR vacuum control solenoid should be repaired or replaced as per the need
• Carefully repair the wiring shorted to the EGR vacuum control solenoid
• You can always replace the shorted or open EGR vacuum solenoid

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

• Firstly, you must scan the codes and document the freeze frame data in order to verify the problem
• All the engine codes should be cleared up and road test the vehicle to verify whether the code comes back
• Visually inspect the wiring and connections to the EGR control solenoid along with the EGR temperature sensor
• Disconnect and check the EGR valve vacuum control solenoid for a short or open circuit in the solenoid.
• The solenoid connection for corrosion in connection should then be inspected properly

Common Mistakes When Diagnosing The P0403 Code

• A common mistake can be a failure to disconnect the connection to the EGR control solenoid to check the connection for a corrosion build-up that could cause an open circuit to the ECM that could set this code
• Make sure to check the wiring harness for cut wires causing an open circuit before replacing a solenoid which is working properly