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I have a 2014 6.7L, both EGR and DPF deleted, but today, out of the blue today, I got a P0472 (Exhaust Pressure Sensor A Circuit Low) and a U029D (Lost Communication with NOX Sensor 'A').
Then the truck went into limp mode, and I had a heck of a time getting home.
Aren't both of the sensors involved in these messages disabled by the tuner?
Hopefully, this is a quick fix; any help is appreciated!
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My advice is to inspect the disconnected plugs and wiring going to those code devices.
Check for any damage or corrosion.
Did you install Shibby plugs or tape them up to protect from the elements?
2014 RAM 3500 (Aisin) 3.73 4X4 Limited Crew Cab Long Bed DRW. Oil Bypass Filter, Fuel Filtration Kit and 50 Gallon auxiliary fuel tank.
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No I did not for either of those.Quote:
Originally Posted by AK Bob
Never been an issue in water, mud, or snow until now :-/
I assume the 0472 is the exhaust pressure sensor but what's the u029 "NOx sensor*?
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If you didn’t protect the disconnected plug ends, they probably could have corrosion which might have led to your issue.
Have you contacted the person who tuned your rig?
2016 Ram Laramie 3500, G56, 6.7, CC, 4x4
I did reach out to them later last night.Quote:
Originally Posted by watersupply189
Am I to assume these codes are tune-related?
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That is a good question to ask your tuner.Quote:
Originally Posted by jgruberman
However, having two codes pop up for no apparent reason would make me believe you have a plug or wiring issue affecting those circuits.
Hoping it’s something simple.
Please keep us posted.
2014 RAM 3500 (Aisin) 3.73 4X4 Limited Crew Cab Long Bed DRW. Oil Bypass Filter, Fuel Filtration Kit and 50 Gallon auxiliary fuel tank.
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Ray with DRD says the U029 DTC is normal with all 13+ deleted trucks and doesn't hinder performance.Quote:
Originally Posted by AK Bob
It's the P0472 exhaust pressure circuit code that I'm struggling with.
I just don't get how a sensor that isn't connected can throw a code?
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“On 13-newer trucks, the exhaust backpressure sensor can be removed because the ECM doesn't mind losing its input”.Quote:
Originally Posted by jgruberman
Looking at my notes, this statement from Ray suggests that the PCM is still connected to the backpressure circuit and is okay with an open circuit.
Nothing coming back on K335 or K934.
See attached PDF for diagram and theory of operation.
Attachment 13586
2014 RAM 3500 (Aisin) 3.73 4X4 Limited Crew Cab Long Bed DRW. Oil Bypass Filter, Fuel Filtration Kit, and 50 Gallon auxiliary fuel tank.
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The PDF didn't attach properly.
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Very odd because I can access the attachment on both Tapatalk and the IGOTACUMMINS website.Quote:
Originally Posted by jgruberman
Please try it again on both; if you still have trouble, I can PM it to you.
2014 RAM 3500 (Aisin) 3.73 4X4 Limited Crew Cab Long Bed DRW. Oil Bypass Filter, Fuel Filtration Kit and 50 Gallon auxiliary fuel tank.
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