2006 Duramax P0401 & P0402 DTC Code
#1
2006 Duramax P0401 & P0402 DTC Code
My check engine light came on today so I put my Bully Dog tuner on and codes P0401 and P0403 came up. From what I have found out it is something related to the EGR. If so does it mean that it's pluged? It has 32750 miles on it.
#2
Did some research and these are the fixes I have come up with:
-Check the voltage at the DPFE sensor both at idle and when the EGR is open
-Replace DPFE sensor
-Check the voltage at the DPFE sensor both at idle and when the EGR is open
-Replace DPFE sensor
- 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
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