Question about 2005 Dodge Ram 1500

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I have a code p403. cleaned egr valve and checked o2 sensors.

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  • kevin gillis Feb 06, 2010

    tried clearing code with scanner and as soon as you start the truck, code returns.exhaust gas recirculation control circuit.thinking the erg valve isnt functioning at all?

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Unless you have a scanner to clear the code, remove the cables from battery for about an hour, this should clear the code, then after a drive cycle it could reappear, if you did not fix the problem or you need a new
valve. Sometimes the codes are not exact and other things can cause a code that is stated for one thing.

Hopefully someone that has had this code will reply, if this does not help.

Posted on Feb 05, 2010

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Posted on Jan 02, 2017

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Code P 0404 P403 and P 406 mean


P0404 Exhaust Gas Recirculation Circuit Range/PerformanceP0403 Exhaust Gas Recirculation Circuit Malfunction
P0406 Exhaust Gas Recirculation Sensor A Circuit High


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How do you repair codes PO141 and PO136 2000 Ford E-350 with a 5.4 engine


Causes 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, this is the common cause
  • 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 Solutions In 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

Symptoms There may be no visible symptoms to the driver. Poor fuel mileage, possible misfire, depending on O2 sensor position when sticking.
Causes A code P0136 may mean that one or more of the following has happened:
  • Faulty O2 sensor leak in exhaust close to O2 sensor, faulty O2 sensor is the common cause.
  • Short to voltage on O2 signal circuit
  • Open in circuit resistance caused by corrosion in connector
Possible Solutions
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  • Repair open or short in signal circuit
  • Clean corrosion from connector

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EGR flow is monitored by the PCM by it looking for a reaction in the FRONT O2 sensor in responce to the command given to the EGR valve. The linear electronic EGR valve sends a return signal to the PCM indicating the relative position of the step motor and hence how far open (or closed) the EGR valve is in responce to the PCM command. The PCM expects to see (within a set of given parameters) a change in the O2 sensor reading (change in exhaust gas make up) after the EGR valve is commanded open or closed. If it doesn't, or that change is not within the expected parameters, a code will be set based on the skewed data. Generally a "insufficient flow" code will be set by:

1.Faulty EGR valve (sticking, or "lying" to the PCM about the actual valve position)
2.Faulty electrical connection at the EGR valve (causing false data)
3.Clogged EGR passages
4. Bad read from the MAP, or TPS, causing the PCM to misinterpret the EGR data based on faulty operational data from the other sensors
5. (Very rarely) A marginally "slow" O2 sensor. (PCM does not "see" the change in exhaust make up quick enough and interprets that as poor EGR flow.)
I have found that normally this code means that the EGR is not opening the amount that it has been commaneded to by the PCM. Normal cure for me lately has beed to repalce the EGR valve and to clean out the passages while the valve is off. The Tech 2 is able to command the EGR open and show the commanded opening and the actual opening. When this code is present the actual and commanded do not match closely at all. Thanks for using FixYa - a FixYa rating is appreciated for taking the time to answer your FREE question.

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