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P0400 - Exhaust Gas Recirculation Flow Malfunction

Possible causes
- Exhaust Gas Recirculation (EGR) volume control valve stuck closed
- Faulty Exhaust Gas Recirculation (EGR) volume control solenoid valve
- Faulty EGR Valve
- Faulty EGR temperature sensor and circuit
- Exhaust Gas Recirculation (EGR) solenoid valve harness is open or shorted
- Exhaust Gas Recirculation (EGR) solenoid valve circuit poor electrical connection
- Dead (Weak) battery
Tech notes
EGR flow malfunction could be caused by a clogged EGR valve or EGR tube. Before replacing any parts try cleaning the EGR valve, tube and passages.
When is the code detected?
Exhaust Gas Recirculation (EGR) flow control is not responding
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Possible engine hesitation
P0400 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.

P0400 Information for specific makes
P0400 ACURA Exhaust Gas Recirculation System Leak Detected
P0400 AUDI Exhaust Gas Recirculation Flow
P0400 CHRYSLER Exhaust Gas Recirculation System Performance
P0400 DODGE Exhaust Gas Recirculation System Performance
P0400 FORD Exhaust Gas Recirculation Flow
P0400 HONDA Exhaust Gas Recirculation System Leak Detected
P0400 INFINITI Exhaust Gas Recirculation Function- No/Low Flow Detected
P0400 JEEP Exhaust Gas Recirculation System Performance
P0400 MAZDA Exhaust Gas Recirculation Flow Malfunction
P0400 MERCEDES-BENZ Exhaust Gas Recirculation Flow Malfunction
P0400 MITSUBISHI Exhaust Gas Recirculation Flow Malfunction
P0400 NISSAN Exhaust Gas Recirculation Function- No/Low Flow Detected
P0400 SUBARU Exhaust Gas Recirculation Flow
P0400 VOLKSWAGEN Exhaust Gas Recirculation Flow
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