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P0403 is a diagnostic trouble code (DTC) for "Exhaust Gas Recirculation Circuit Malfunction". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
Exhaust Gas Recirculation Circuit Malfunction
P0403 is an OBD-II generic code that indicates that the engine control module (ECM) has detected the engine exhaust gas recirculation (EGR) circuit has malfunctioned. The ECM detected a short or open circuit in the EGR vacuum control solenoid or wiring to the solenoid.
The ECM monitors the EGR vacuum control solenoid voltage and will detect a short or open circuit to the solenoid.
The EGR vacuum control solenoid is shorted or open internally.
The solenoid connection is corroded and losing connections.
Scans codes and documents the freeze frame data in order to verify the problem.
Clears the engine codes and road tests the vehicle to verify whether the code comes back.
Visually checks the wiring and connections to the EGR control solenoid along with the EGR temperature sensor.
Disconnects and checks the EGR valve vacuum control solenoid for a short or open circuit in the solenoid.
Checks solenoid connection for corrosion in connection.
Failing to disconnect the connection to the EGR control solenoid to check the connection for a corrosion buildup that could cause an open circuit to the ECM that could set this code.
Failing to check the wiring harness for cut wires causing an open circuit before replacing a good solenoid.
An EGR system that triggers this code IN the ECM will disable the EGR system and render it inoperative.
The Check Engine Light being on will cause the vehicle to fail emission testing and may cause the engine to ping on acceleration.
Code P0403 is triggered when the EGR vacuum control solenoid is not making a complete and correct circuit to the ECM. When this happens, the ECM will turn off its control of the solenoid.
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