P0400 Ford

P0400 Ford - Exhaust Gas Recirculation Flow

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P0400 Ford Comments |  Add Comment
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
What does this mean? What does this mean?
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.
What does this mean? What does this mean?
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 Ford 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 Ford Information for specific Ford models
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FORD Technical Service Bulletins for P0400 code
2002 FORD EXPLORER Unknown Or Other Details
1996 FORD ASPIRE Engine And Engine Cooling:exhaust System:emission Control:gas Recirculation Valve (egr Valve) Details
What does this mean? What does this mean?
Repair Shops Around Your Area
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Repair Importance Level
2
1=Low 2=Medium 3=High Code Importance Level
Repair Difficulty Level
2
1=Easy 2=Moderate 3=Hard Code Importance Level
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