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P0401 Diagnostic Trouble Code Discussion for August 2009

Insufficient EGR Flow Detected


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Trouble Ticket Help Requests for DTC P0401
Help Request Posted
2005 GMC Sierra 2500 HD SLE 6.6L Hesitation, MIL Lamp on VIN: 1GTHK23255
P0401: EGR Flow Insufficient Detected. ... black smoke. I connected the Tech 2 and retrieved codes P0101, P0299, P0401, and P0404. I inspected the air intake system for any leaks or loose clamps. Took truck for a drive and had very low power with boost sensor rea...
August 01, 2009
1999 Mercury Sable GS 3.0L MIL Lamp on VIN: 1MEFM53S2Z
... on and code p0401 and p1408. Replaced EGR valve and DPFE sensor, cleaned EGR passages, cleared codes. Customer came back last week with MIL on and misfire. Replaced plugs & wires, cleaned intake and EGR passages (again). Customer came back this week wi...
August 05, 2009
2003 Lincoln Navigator 5.4L Poor Idle Quality, Misfire, MIL Lamp on VIN: 5LMFU28R73
P0401: Insufficient EGR Flow Detected (ESM System). HI Y'ALL!! THis truck is a real headache!! Original complaint was misfire on accel! Found misfire events on mode 6 cyl #3 had about 1800 misfires in memory! OK replaced all spark plugs and cyl #3 coil! There were no codes at that time! Later found vacuum leak ...
August 09, 2009
2004 Ford F-550 Super Duty XL 6.0L No Start, Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire VIN: 1FDAF56P94
P0401: Insufficient EGR Flow Detected. truck was on a road call and started chugging and losing power, blowing black smoke. limped home spent last week on it doing tests and getting familiar with systems. fuel pressure check at water separator showed good at 80 psi(specs are 55-65) could not start ...
August 10, 2009
2004 Ford F-550 Super Duty XL 6.0L No Start, Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire VIN: 1FDAF56P94
P0401: Insufficient EGR Flow Detected. truck was on a road call and started chugging and losing power, blowing black smoke. limped home spent last week on it doing tests and getting familiar with systems. fuel pressure check at water separator showed good at 80 psi(specs are 55-65) could not start ...
August 12, 2009
2002 Ford F-150 Harley-Davidson Edition 5.4L MIL Lamp on VIN: 1FTRW07392
P0401: egr flow out of range. ... s/c. has code for egr flow out of range (p0401) when i engage the egr valve, the engine stalls immediately, put vac to dpfe and it reads to 4v, drops back down to 1 when vac is released, egr solenoid is operational and i found no vacuum leaks, not sure whe...
August 13, 2009
1996 Ford F-150 XL 5.0L dpfe hoses blow off VIN: 1FTEF15N6T
P0401: insuficient egr flow. Truck was towed in and would not start. We replaced the coil, coil wire and dist. cap & rotor to get truck to start. We also noticed both DPFE hoses were disconnected from DPFE sensor reconnected hoses and on test drive truck had no power (restricted exhau...
August 26, 2009
2004 Ford F-350 Super Duty XLT 6.0L no power VIN: 1FTWW33P24
P0401: Insufficient EGR Flow Detected. truck backfired and now has no power
August 27, 2009