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2008 2500HD LMM miles 289000
With Western Wideout plow
Used daily for my auto repair business
I bought the truck used in June. Had check engine light on when I bought it. It needed 4 new glow plugs, so three weeks ago I replaced all glow plugs and cleared codes. Check engine light came back on today.
P0401
 

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2008 2500HD LMM miles 289000
With Western Wideout plow
Used daily for my auto repair business
I bought the truck used in June. Had check engine light on when I bought it. It needed 4 new glow plugs, so three weeks ago I replaced all glow plugs and cleared codes. Check engine light came back on today.
P0401


Here’s what I found on it.


Symptoms
You may notice drivability problems such as pinging (a.k.a. pre-ignition knock) when the engine is under load or the vehicle is at higher speeds. There may also be other symptoms.
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 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 vacuum
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


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