P0400 FORD - Exhaust Gas Recirculation Flow
- 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 notesEGR 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
- Engine Light ON (or Service Engine Soon Warning Light)
- Possible engine hesitation
P0400 Ford DescriptionEarly 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
- P0400 1997 FORD F150
- P0400 1998 FORD F150
- P0400 1999 FORD F150
- P0400 2000 FORD F150
- P0400 2001 FORD F150
- P0400 2002 FORD F150
- P0400 2003 FORD F150
- P0400 2006 FORD FUSION
- P0400 2007 FORD FUSION
- P0400 2008 FORD FUSION
- P0400 2009 FORD FUSION
- P0400 2010 FORD FUSION
- P0400 2011 FORD FUSION
- P0400 2012 FORD FUSION
Need more help?Get the P0400 Ford code diagnosed by a professional: Find a repair shop in your area
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