Fault info
Hey there,
Per your code this is a list of possible causes. 1-Damaged EGR pressure sensor. 2-Stuck open EGR valve. 3- EGR pressure sensor ports clogged. Also per Cummins troubleshooting you are to check and see if the ECM is flashed with the latest revision. I have seen sensors fail, valves fail (out right and with debris holding open), and I have seen the ports plugged with carbon.
Since you don't mention any other faults relating to the valve itself, I am inclined to look at the ports being plugged. Since I don't have an engine serial number I can't check for any different info by the actual ECM model.
Look on the intake side of the engine (opposite of the turbo) now look for a device with a 3 wire harness going to it and I believe a 2 bolt bracket holding it down. The bracket covers about 1/2 the sensor and it bolts to the other end from the harness connection. Unbolt it and carefully remove it. Look at the bottom of the sensor for cacked on carbon and look where it bolts to the manifold for the 2 holes that feed it the exhaust gases. They need to be free and open. There may be 2 plugs that grant you access to the cross drillings into the gas stream. If plugged you need to be very careful not to scratch off the GREEN colored coating that is applied to resist carbon build up. ( actually a joke or we wouldn't have a plugging issue). Per cummins you can only clean with a wooden stick (skewer?) or pipe cleaners. I think a little bit of carb cleaner may help but it's not sanctioned by cummins. There are 2 plugs to remove that also uncover the remainder of the passages. Cummins does offer the intake piece for sale and if I recall it wasn't as bad as I thought it would be (because it's a common issue I think).
Try that, but I do have to caution there is a reason they charge $100 to check codes.... It's called a $3000 software/hardware suite just to do so. And with that you have the access to all the tests you really need to do to t/s most electronic issues. Per the t/s on this code alone you are testing the EGR valve and pin testing the sensor garness and looking at live engine data to check operation. A leaking water pump is easy to diagnose as no electrons are in the equation. But electronic diagnosis via changing parts or guessing is iffy at best.
Good luck, if you get me some more info I will check a little deeper. But not till Monday night - sorry, gotta take the family to the coast.
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1998 Signature 42' M11 450hp - -pulling 25" enclosed trailer with SCU sandcar inside
Lovely Wife, 2 kids, 3 dogs, 2 cats
Diesel Mechanic to the stars
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