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P0405 - Exhaust Gas Recirculation Sensor 'A' Circuit Low

Possible causes
- Faulty EGR volume control solenoid valve
- Carbon built up on EGR valve
- EGR volume control solenoid valve harness is open or shorted
- EGR volume control solenoid valve circuit poor electrical connection
- Faulty EGR temperature sensor and circuit
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)
- Engine hesitation
P0405 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.

P0405 Information for specific makes
P0405 BUICK Exhaust Gas Recirculation Position Sensor Circuit Low Voltage
P0405 CADILLAC Exhaust Gas Recirculation Position Sensor Circuit Low Voltage
P0405 CHEVROLET Exhaust Gas Recirculation Position Sensor Circuit Low Voltage
P0405 CHRYSLER Exhaust Gas Recirculation Position Sensor Circuit Low
P0405 DODGE Exhaust Gas Recirculation Position Sensor Circuit Low
P0405 FORD Exhaust Gas Recirculation Sensor 'A' Circuit Low
P0405 GMC Exhaust Gas Recirculation Position Sensor Circuit Low Voltage
P0405 INFINITI Exhaust Gas Recirculation Temperature Sensor Circuit Low Input
P0405 ISUZU Exhaust Gas Recirculation Position Sensor Circuit Low Voltage
P0405 JEEP Exhaust Gas Recirculation Position Sensor Circuit Low
P0405 MAZDA Exhaust Gas Recirculation Sensor 'A' Circuit Low
P0405 MERCEDES-BENZ Exhaust Gas Recirculation Sensor 'A' Circuit Low
P0405 MITSUBISHI Exhaust Gas Recirculation Position Sensor Circuit Low
P0405 NISSAN Exhaust Gas Recirculation Temperature Sensor Circuit Low Input
P0405 PONTIAC Exhaust Gas Recirculation Position Sensor Circuit Low Voltage
P0405 SATURN Exhaust Gas Recirculation Position Sensor Circuit Low Voltage
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