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P0401 Exhaust Gas Recirculation Flow Insufficient Detected - reduced flow might be caused by a sticking EGR valve or restricted/blocked EGR passages/ports.
Fix the code by finding and fixing the problem and then have the code cleared with suitable diagnostic equipment.
Diagnostic equipment with 2-way software would allow the EGR valve to be operated from the keyboard/screen and could make fault finding easier.
P0401 Exhaust Gas Recirculation Flow Insufficient Detected. Remove EGR valve and check for blockage in the passages of the exhaust and intake. If those are clean, replace the EGR valve. EGR valve failure is very common on Chrylsers.
code p0401 refers to exhaust gas recirculation(EGR) system-insufficient flow detected--- Causes ---hose leak/blockage, basic setting not carried out( if applicable)wiring--EGR valve/solenoid---ECM I would check the EGR valve solenoid first. Replace the faulty units with genuine one because most aftermarket units are not set for OEM cpu units and are not completely compatible.
EGR stands for Exhaust Gas Recirculation. It is part of the vehicle emmissions system, and is used to reduce combustion temperature and pressure to control Oxides of Nitrogen. There are generally three parts to the EGR system: the EGR valve, an actuator solenoid, and a differential pressure sensor EGR (DPFE). These things work together to deliver the correct amount of recirculation based on engine temperature, load, etc. The P0401 code means that OBD detected an insufficient amount of EGR. You may notice drivability problems such as pinging (a.k.a. pre-ignition knock) when the engine is under load or the vehicle is at higher speeds. There may also be other symptoms.
A code P0401 most likely means one or more of the following has happened: The DPFE (differential pressure feedback EGR) sensor is faulty and needs to be replaced There is a blockage in the EGR (tube), most likely carbon buildup The EGR valve is faulty The EGR valve may not be opening due to a lack of vaccuum
Check it and keep us updated. Hope this helps (remember to rating this free answer).
but for convenience I have reproduced that information here: . Generic OBD Error Code Details for P0401Exhaust Gas Recirculation Flow Insufficient Detected
What does this mean? OBD Code P0401refers to EGR stands for Exhaust Gas Recirculation. It is part of the vehicle emmissions system, and is used to reduce combustion temperature and pressure to control Oxides of Nitrogen. There are generally three parts to the EGR system: the EGR valve, an actuator solenoid, and a differential pressure sensor EGR (DPFE). These things work together to deliver the correct amount of recirculation based on engine temperature, load, etc. The P0401 code means that OBD detected an insufficient amount of EGR.
SymptomsPossible sumptoms of OBD code P0401 You may notice drivability problems such as pinging (a.k.a. pre-ignition knock) when the engine is under load or the vehicle is at higher speeds. There may also be other symptoms.
CausesPossible causes of OBD code P0401 A code P0401 most likely means one or more of the following has happened: •The DPFE (differential pressure feedback EGR) sensor is faulty and needs to be replaced•There is a blockage in the EGR (tube), most likely carbon buildup •The EGR valve is faulty •The EGR valve may not be opening due to a lack of vaccuum
Possible SolutionsIn fixing this code, it is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit. •Use a vacuum pump and pull the EGR valve open while monitoring engine RPM's & DPFE voltage. There should be a noticable difference in RPM's with the EGR open •Clean out the EGR valve and/or tubing to remove deposits•Check the voltage at the DPFE, compare to specified values (refer to a repair manual for your specific model)•Replace the DPFE sensor (with a good quality / OEM one)•Replace the EGR valve
Related CodesP0400 P0402 P0403
P0401 - Exhaust Gas Recirculation Flow Insufficient Detected
Possible causes
- Harness or connectors (EGR volume control valve circuit is open or shorted.) - EGR volume control valve stuck closed - EGR volume control solenoid valve - Dead (Weak) battery - EGR passage clogged - Exhaust gas leaks
Possible solution
- Clean EGR Valve - Repair EGR harness or connector - Replaced EGR volume control solenoid valve - Replaced EGR volume control valve
P0401 - Exhaust Gas Recirculation Flow Insufficient Detected
Possible Causes: - Harness or connectors (EGR volume control valve circuit is open or shorted.) - EGR volume control valve stuck closed - EGR volume control solenoid valve - Dead (Weak) battery - EGR passage clogged - Exhaust gas leaks - Faulty EGR valve
Possible Solutions: - Clean EGR Valve - Replace EGR Valve - Repair EGR harness or connector - Replace EGR volume control solenoid valve - Replace EGR volume control valve
P0401 Exhaust Gas Recirculation Flow Insufficient Detected
Remove the EGR valve and clean up passage ways using spray on carburetor/fuel injector cleaner.
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