Join Now
International Automotive Technicians Network

P0401 Diagnostic Trouble Code Discussion for March 2015

Insufficient EGR Flow Detected


Note: This is a professional automotive technician's resource.
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Trouble Ticket Help Requests for DTC P0401
Help Request Posted
2002 GMC Sierra 2500 HD SL 8.1L MIL Lamp on VIN: 1GTHK23GX2
P0401: Insufficient EGR Flow Detected. Check engine light comes on and off on highway driving. Code po401. Does anyone know if the egr ports gets clogged on 8.1l engines and if it does where? do you have to remove intake manifold to clean out ports?
March 04, 2015
2000 Buick Park Avenue Ultra 3.8L MIL Lamp on VIN: 1G4CU5415Y
P0401: Insufficient EGR Flow Detected. ... Buick Park Ave. with a 3.8 super charged engine, that is setting a p0401 on every test drive. EGR valve has been replaced, EGR valve does move to 100% when commanded and vehicle starts to misfire and run rough when commanding it. Removed EGR tubes and insp...
March 09, 2015
2009 Ford Crown Victoria Police Interceptor 4.6L MIL Lamp on VIN: 2FAHP71V89
P0401: EGR flow insufficient. We have this 2009 CVPI Patrol car that has an E.G.R. and A/C issue. The car runs perfectly at idle and cruise. With the Solus Pro hooked up and car warmed up, the O2S sensors look good switching with cross counts at idle and up the range and the after Cat read...
March 09, 2015
2000 Buick Park Avenue Ultra 3.8L MIL Lamp on VIN: 1G4CU5415Y
P0401: Insufficient EGR Flow Detected. ... Buick Park Ave. with a 3.8 super charged engine, that is setting a p0401 on every test drive. EGR valve has been replaced, EGR valve does move to 100% when commanded and vehicle starts to misfire and run rough when commanding it. Removed EGR tubes and insp...
March 10, 2015