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P0403 - Exhaust Gas Recirculation Circuit Malfunction

Possible causes
- Faulty EGR volume control solenoid valve
- EGR volume control solenoid valve harness is open or shorted
- EGR volume control solenoid valve circuit poor electrical connection
- EGR temperature sensor and circuit
What does this mean? What does this mean?
When is the code detected?
An improper voltage signal is sent to ECM through the valve
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Possible engine hesitation
P0403 Description

Early Exhaust Gas Recirculation (EGR) systems component s include and EGR Valve, and Engine Control Μodule (ECΜ) Controlled Vacuum Switch Valve or EGR Solenoid and an EGR Vacuum Μodulator. Depending on the engine and driving conditions, the ECΜ will control the EGR Solenoid which will operate the EGR Vacuum Μodulator to regulate the opening and closing of the EGR Valve.

The EGR system on recently built vehicles uses a step motor to control the flow rate of EGR from exhaust manifold. This motor has four winding phases. It operates according to the output pulse signal of the ECΜ. Two windings are turned ON and OFF in sequence. Each time an ON pulse is issued, the valve opens or closes, changing the flow rate. When no change in the flow rate is needed, the ECΜ does not issue the pulse signal. Α certain voltage signal is issued so that the valve remains at that particular opening.

P0403 Information for specific makes
P0403 AUDI Exhaust Gas Recirculation Control Circuit
P0403 BUICK Exhaust Gas Recirculation Circuit Malfunction
P0403 CADILLAC Exhaust Gas Recirculation Circuit Malfunction
P0403 CHEVROLET Exhaust Gas Recirculation Circuit Malfunction
P0403 CHRYSLER Exhaust Gas Recirculation Control Circuit Open  P0403 Video
P0403 DODGE Exhaust Gas Recirculation Control Circuit Open
P0403 FORD Exhaust Gas Recirculation Control Circuit
P0403 GMC Exhaust Gas Recirculation Circuit Malfunction
P0403 INFINITI Exhaust Gas Recirculation Volume Control Valve Circuit
P0403 ISUZU Exhaust Gas Recirculation Solenoid Control Circuit
P0403 JEEP Exhaust Gas Recirculation Control Circuit Open
P0403 MAZDA Exhaust Gas Recirculation Valve Stepper Motor Circuit Malfunction
P0403 MERCEDES-BENZ Exhaust Gas Recirculation Circuit Malfunction
P0403 MITSUBISHI Exhaust Gas Recirculation Control Circuit
P0403 NISSAN Exhaust Gas Recirculation Volume Control Valve Circuit
P0403 PONTIAC Exhaust Gas Recirculation Circuit Malfunction
P0403 SATURN Exhaust Gas Recirculation Circuit Malfunction
P0403 VOLKSWAGEN Exhaust Gas Recirculation Control Circuit
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