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P0401 - Exhaust Gas Recirculation Flow Insufficient Detected

Possible causes
- EGR passage clogged
- Faulty EGR Vacuum Modulator Valve
- Faulty EGR Valve
- Faulty EGR solenoid valve
- EGR solenoid valve harness is open or shorted
- EGR solenoid valve circuit poor electrical connection
- Dead (Weak) battery
- Faulty EGR temperature sensor and circuit
- Exhaust gas leaks
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?
- Low EGR flow control is detected
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Possible engine hesitation
P0401 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.

P0401 Information for specific makes
P0401 ACURA Exhaust Gas Recirculation Insufficient Flow  P0401 Video
P0401 AUDI Exhaust Gas Recirculation Flow Insufficient Detected
P0401 BUICK Exhaust Gas Recirculation Flow Insufficient  P0401 Video
P0401 CADILLAC Exhaust Gas Recirculation Flow Insufficient  P0401 Video
P0401 CHEVROLET Exhaust Gas Recirculation Flow Insufficient  P0401 Video
P0401 CHRYSLER Exhaust Gas Recirculation System Performance
P0401 DODGE Exhaust Gas Recirculation System Performance
P0401 FORD Exhaust Gas Recirculation Flow Insufficient Detected  P0401 Video
P0401 GMC Exhaust Gas Recirculation Flow Insufficient  P0401 Video
P0401 HONDA Exhaust Gas Recirculation Insufficient Flow  P0401 Video
P0401 ISUZU Exhaust Gas Recirculation Flow Insufficient Detected
P0401 JEEP Exhaust Gas Recirculation System Performance
P0401 KIA Exhaust Gas Recirculation Flow Insufficient Detected
P0401 LEXUS Exhaust Gas Recirculation Flow Insufficient Detected
P0401 LINCOLN Exhaust Gas Recirculation Flow Insufficient Detected  P0401 Video
P0401 MAZDA Exhaust Gas Recirculation Flow Insufficient Detected
P0401 MERCEDES-BENZ Exhaust Gas Recirculation Flow Insufficient Detected
P0401 MERCURY Exhaust Gas Recirculation Flow Insufficient Detected  P0401 Video
P0401 MITSUBISHI Exhaust Gas Recirculation Flow Insufficient Detected
P0401 PONTIAC Exhaust Gas Recirculation Flow Insufficient
P0401 SATURN Exhaust Gas Recirculation Flow Insufficient
P0401 SCION Exhaust Gas Recirculation Flow Insufficient Detected
P0401 SUZUKI Exhaust Gas Recirculation Flow Insufficient Detected
P0401 TOYOTA Exhaust Gas Recirculation Flow Insufficient Detected
P0401 VOLKSWAGEN Exhaust Gas Recirculation Flow Insufficient Detected
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