Join Now
International Automotive Technicians Network

P0401 Diagnostic Trouble Code Discussion for June 2007

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
1995 Buick Riviera 3.8L No Start VIN: 1G4GD22145
P0401: egr flow test failure. scan data- tech 2 not running- rpm 20/ egr pintle 100% 5 volts- diconnecct 0 /tps coolant and iac sensors read o or -40 f at times- loose data at times- back probed ecm on tps haves normal readings- egr normal- iac normal-lab scoped fuel control signal normal ...
June 04, 2007
1995 Buick Riviera 3.8L No Start VIN: 1G4GD22145
P0401: egr flow test failure. scan data- tech 2 not running- rpm 20/ egr pintle 100% 5 volts- diconnecct 0 /tps coolant and iac sensors read o or -40 f at times- loose data at times- back probed ecm on tps haves normal readings- egr normal- iac normal-lab scoped fuel control signal normal ...
June 05, 2007
2002 Dodge Intrepid ES 3.5L MIL Lamp on VIN: 3B3HD56M52
P0401: EGR System Performance. P0401 code recurs; Hello and thank you all for your time. This car came in from a local tire shop having failed NYS emission test due to SES lamp on and two codes. P0135 and P0401 Replaced both upstream o2 sensors on 6/1/07 and cleared codes. Today 6/7/07 car ...
June 07, 2007
2001 Hyundai Santa Fe GL 2.4L MIL Lamp on, P0401 VIN: KM8SB82B81
P0401: EGR System - Insufficient Flow Detected. Hey guys, Yet another day in intermittent-ville. This Santa Fe will intermittently fail the EGR monitor. And this really needs to pass an inspection to get new tags. I can drive this vehicle and it will pass the monitor, clear all data, run it some more, pass...
June 07, 2007
1996 Toyota Corolla 1.6L MIL Lamp on VIN: 2T1BA02E4T
P0401: egr low flow. This car is back with same code p0401. we have already changed the vacuum solenoid and pressuure transducer, removed the intake and cleaned carbon from inside manifold and egr passages. egr valve will stall out engine when operated at idle and appears to be wo...
June 07, 2007
1996 Ford E-250 Econoline XL 5.8L MIL Lamp on VIN: 1FTHE24H5T
P0401: Insuffiecent Egr Operation. The EGR Valve is never turned on by the PCM. There is good Vacuum to the EGR Solenoid. There is System Voltage on the B+ side of the EGR Soleniod but the PCM never Grounds the Brown/Pink wire at the EGR Soleniod. I can back probe the Brown with Pink wire at th...
June 12, 2007
1997 Chrysler Concorde LX 3.5L MIL Lamp on VIN: 2L3HD56F9V
P0401: EGR System Performance. Help all chrysler techs! This vehicle came in with a complaint of running poorly and check engine light on. We have never duplicated the poor run but we found code for insufficient egr flow. we have tested the system, soleniod is funtioning- pcm interupts powe...
June 15, 2007
1996 Buick Regal Custom 3.1L MIL Lamp on VIN: 2G4WB52M6T
P0401: Insufficient EGR Flow Detected. ... this one. vehicle keeps setting code p0401 egr insuffient flow. removed egr valve to inspect passages, no restriction found. we then did a induction flush to remove any carbon. After induction flush we noticed that the map reading did increase more when ap...
June 18, 2007
1996 Toyota Camry DX 2.2L MIL Lamp on VIN: 4T1BG12K8T
P0401: EGR System Insufficient Flow Detected. fails obd readiness for egr system,vacuum readings proper,switching valve working proper,HELP THANKS
June 28, 2007
1995 Buick Riviera 3.8L No Start VIN: 1G4GD22145
P0401: egr flow test failure. scan data- tech 2 not running- rpm 20/ egr pintle 100% 5 volts- diconnecct 0 /tps coolant and iac sensors read o or -40 f at times- loose data at times- back probed ecm on tps haves normal readings- egr normal- iac normal-lab scoped fuel control signal normal ...
June 04, 2007
1995 Buick Riviera 3.8L No Start VIN: 1G4GD22145
P0401: egr flow test failure. scan data- tech 2 not running- rpm 20/ egr pintle 100% 5 volts- diconnecct 0 /tps coolant and iac sensors read o or -40 f at times- loose data at times- back probed ecm on tps haves normal readings- egr normal- iac normal-lab scoped fuel control signal normal ...
June 05, 2007
2002 Dodge Intrepid ES 3.5L MIL Lamp on VIN: 3B3HD56M52
P0401: EGR System Performance. P0401 code recurs; Hello and thank you all for your time. This car came in from a local tire shop having failed NYS emission test due to SES lamp on and two codes. P0135 and P0401 Replaced both upstream o2 sensors on 6/1/07 and cleared codes. Today 6/7/07 car ...
June 07, 2007
2001 Hyundai Santa Fe GL 2.4L MIL Lamp on, P0401 VIN: KM8SB82B81
P0401: EGR System - Insufficient Flow Detected. Hey guys, Yet another day in intermittent-ville. This Santa Fe will intermittently fail the EGR monitor. And this really needs to pass an inspection to get new tags. I can drive this vehicle and it will pass the monitor, clear all data, run it some more, pass...
June 07, 2007
1996 Toyota Corolla 1.6L MIL Lamp on VIN: 2T1BA02E4T
P0401: egr low flow. This car is back with same code p0401. we have already changed the vacuum solenoid and pressuure transducer, removed the intake and cleaned carbon from inside manifold and egr passages. egr valve will stall out engine when operated at idle and appears to be wo...
June 07, 2007
1996 Ford E-250 Econoline XL 5.8L MIL Lamp on VIN: 1FTHE24H5T
P0401: Insuffiecent Egr Operation. The EGR Valve is never turned on by the PCM. There is good Vacuum to the EGR Solenoid. There is System Voltage on the B+ side of the EGR Soleniod but the PCM never Grounds the Brown/Pink wire at the EGR Soleniod. I can back probe the Brown with Pink wire at th...
June 12, 2007
1997 Chrysler Concorde LX 3.5L MIL Lamp on VIN: 2L3HD56F9V
P0401: EGR System Performance. Help all chrysler techs! This vehicle came in with a complaint of running poorly and check engine light on. We have never duplicated the poor run but we found code for insufficient egr flow. we have tested the system, soleniod is funtioning- pcm interupts powe...
June 15, 2007
1996 Buick Regal Custom 3.1L MIL Lamp on VIN: 2G4WB52M6T
P0401: Insufficient EGR Flow Detected. ... this one. vehicle keeps setting code p0401 egr insuffient flow. removed egr valve to inspect passages, no restriction found. we then did a induction flush to remove any carbon. After induction flush we noticed that the map reading did increase more when ap...
June 18, 2007
1996 Toyota Camry DX 2.2L MIL Lamp on VIN: 4T1BG12K8T
P0401: EGR System Insufficient Flow Detected. fails obd readiness for egr system,vacuum readings proper,switching valve working proper,HELP THANKS
June 28, 2007