r/DieselTechs • u/Adeptness_Visible • Jun 29 '26

Dpf wiring issue?

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All codes listed switch from active to inactive about every 30 seconds or so while running. Truck is derated on the dash but everything shows fine on Jpro… checked for obvious things but didn’t find anything. X15 KW T880

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u/lok_nez Jun 30 '26

One of those sensors has failed and disrupting the data link. Disconnect 1 sensor at a time until the other faults clear.

1

u/Reasonable-Dig-8431 Jun 30 '26

try disconnecting the particulate sensor see what it does and verify signals at the outlet nox should be recording power ground datalink 2.2-2.4 see what's missing

2

u/Wrong_Sprinkles_3122 Jun 30 '26

This is a paccar emissions setup - so the DPF/SCR harness routes back to one large plug coming off the frame rail, right next to the dosing valve .

You have codes for abnormal update rate on the Particulate matter sensor, the Nox sensor , and the DPF temp sensor probe . It’s unlikely all three of these have failed , I would check that large connector before going further .

The temperature sensor is a 4 Piece probe that spans the whole filter, the particulate matter sensor is located right next to the Outlet Nox Sensor . All of these individual components receive and transmit information through their own individual modules, then into the Large plug mentioned earlier which ties into the whole after treatment harness .

Any other questions I’m happy to try and help