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Thread: Truck In Limp Mode With Codes P0472 / U029D

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    Truck In Limp Mode With Codes P0472 / U029D

    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!

    Sent from my SM-G986U using Tapatalk


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    DANG IT'S COLD! AK Bob's Avatar

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    Re: Truck In Limp Mode With Codes P0472 / U029D

    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.

    Sent from my iPad using Tapatalk

    2014 RAM 3500 (Aisin) 3.73 4X4 Limited Crew Cab Long Bed DRW. MM3 Tuned by Double R Diesel. Oil Bypass Filter, Fuel Filtration Kit, and 50 Gallon Aux Fuel Tank.

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    Re: Truck In Limp Mode With Codes P0472 / U029D

    Quote Originally Posted by AK Bob View Post
    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.

    Sent from my iPad using Tapatalk
    No I did not for either of those.

    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*?

    Sent from my SM-G986U using Tapatalk


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    Re: Truck In Limp Mode With Codes P0472 / U029D

    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

    2016 RAM 3500 4x4 Laramie Crew Cab
    Cummins,G56, Rough Country level, Morimoto LED fog lights, Diode Dynamics 35W HID headlights, Lund Attitude Steps w/Line-X, DRL's Activated, 35x11.50R18 Falken Wildpeak, Fuel Vapor Wheels Matte Black w/Dark Tint, A.R.E. Truck cap

    2015 Jeep Grand Cherokee Limited 4x4
    2019 Dodge Charger 392 R/T Scatpack Plus

    Past - 2014 RAM 1500 4x4 Lone-Star Eco Diesel

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    Re: Truck In Limp Mode With Codes P0472 / U029D

    Quote Originally Posted by watersupply189 View Post
    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.

    Am I to assume these codes are tune-related?

    Sent from my SM-G986U using Tapatalk


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    DANG IT'S COLD! AK Bob's Avatar

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    Re: Truck In Limp Mode With Codes P0472 / U029D

    Quote Originally Posted by jgruberman View Post
    I did reach out to them later last night.

    Am I to assume these codes are tune-related?

    Sent from my SM-G986U using Tapatalk
    That is a good question to ask your tuner.

    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.

    Sent from my iPad using Tapatalk

    2014 RAM 3500 (Aisin) 3.73 4X4 Limited Crew Cab Long Bed DRW. MM3 Tuned by Double R Diesel. Oil Bypass Filter, Fuel Filtration Kit, and 50 Gallon Aux Fuel Tank.

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    Re: Truck In Limp Mode With Codes P0472 / U029D

    Quote Originally Posted by AK Bob View Post
    That is a good question to ask your tuner.

    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.

    Sent from my iPad using Tapatalk
    Ray with DRD says the U029 DTC is normal with all 13+ deleted trucks and doesn't hinder performance.

    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?

    Sent from my SM-G986U using Tapatalk


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    DANG IT'S COLD! AK Bob's Avatar

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    Re: Truck In Limp Mode With Codes P0472 / U029D

    Quote Originally Posted by jgruberman View Post
    Ray with DRD says the U029 DTC is normal with all 13+ deleted trucks and doesn't hinder performance.

    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?

    Sent from my SM-G986U using Tapatalk
    “On 13-newer trucks, the exhaust backpressure sensor can be removed because the ECM doesn't mind losing its input”.

    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.

    P0472.pdf


    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.

    Sent from my iPad using Tapatalk

    2014 RAM 3500 (Aisin) 3.73 4X4 Limited Crew Cab Long Bed DRW. MM3 Tuned by Double R Diesel. Oil Bypass Filter, Fuel Filtration Kit, and 50 Gallon Aux Fuel Tank.

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    Re: Truck In Limp Mode With Codes P0472 / U029D

    The PDF didn't attach properly.

    Sent from my SM-G986U using Tapatalk


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    DANG IT'S COLD! AK Bob's Avatar

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    Re: Truck In Limp Mode With Codes P0472 / U029D

    Quote Originally Posted by jgruberman View Post
    The PDF didn't attach properly

    Sent from my SM-G986U using Tapatalk
    Very odd because I can access the attachment on both Tapatalk and the IGOTACUMMINS website.

    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.

    Sent from my iPad using Tapatalk

    2014 RAM 3500 (Aisin) 3.73 4X4 Limited Crew Cab Long Bed DRW. MM3 Tuned by Double R Diesel. Oil Bypass Filter, Fuel Filtration Kit, and 50 Gallon Aux Fuel Tank.

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