Excessive Flow EGR Valve
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Junior User
Joined: Nov 2003
Posts: 99
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From: Illinois
Excessive Flow EGR Valve
Has anyone had an OBD code of 0402 (Excessive Flow EGR Valve) end up being anything other than a bad EGR Valve? 99 Expy runs great, but this is the second time I have got that code. If so were you able to clean it up, or was a replacement necessary?
Logistics Pro
Joined: Oct 2000
Posts: 3,960
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From: All over Texas
Ernie:
Here are the culprits. I doubt you have any of the icing issues in Vegas.
-- EGR valve stuck open.
-- EGR vacuum regulator solenoid vent plugged or iced.
-- EVR circuit shorted to GND.
-- EVR circuit shorted to VREF.
-- Improper vacuum hose connection.
-- Plugged/pinched EGR Vacuum Regulator Solenoid vacuum hose.
-- Plugged EGR tube.
-- Damaged EGR Vacuum Regulator Solenoid.
-- Pinched/iced pressure hoses.
-- Damaged Differential Pressure Feedback EGR (D.P.F. EGR) sensor.
-- Damaged PCM.
Here are the culprits. I doubt you have any of the icing issues in Vegas.
-- EGR valve stuck open.
-- EGR vacuum regulator solenoid vent plugged or iced.
-- EVR circuit shorted to GND.
-- EVR circuit shorted to VREF.
-- Improper vacuum hose connection.
-- Plugged/pinched EGR Vacuum Regulator Solenoid vacuum hose.
-- Plugged EGR tube.
-- Damaged EGR Vacuum Regulator Solenoid.
-- Pinched/iced pressure hoses.
-- Damaged Differential Pressure Feedback EGR (D.P.F. EGR) sensor.
-- Damaged PCM.
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Junior User
Joined: Nov 2003
Posts: 99
Likes: 1
From: Illinois
Jim, thanks for all that info. Now to throw this thing into utter confusion, as I was just out with the truck, a new code just appeared - P1406. Not sure if that narrrows it down, or increases the possibilities.
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Junior User
Joined: Nov 2003
Posts: 99
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From: Illinois
Well, pulled the EGR Valve tonite, very little carbon, and was able to move the valve itself with a needle nose pliers, and it (by feel anyway) seems good. Not sure what to look for with regard to the DPFE sensor. After clearing the codes today, withing about 10 minutes, I got the P1406 code again. Auxiallary blada blada bla. Any ideas?
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Junior User
Joined: Nov 2003
Posts: 99
Likes: 1
From: Illinois
Dave, Thanks. I am kind of leaning that way too. Vehicle seems to run fine, not sure if I am using slightly more fuel, but hard to tell as this things always uses too much. Any idea on the cost of of the DPFE sensor? Original code was excessive flow thru the EGR, after clearing that, this P1406 code has come on. I cleared it but it returned in no time. All the hoses look good.
