Multiple misfire, stalling failure to communicate with ECM/PCM?

2014 DODGE TRUCK
250,000 MILES • 4WD • AUTOMATIC
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FREERIDER78
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2014 Ram T1500. Random multiple misfires, failure to communicate with ECM/PCM, coils B,C,D. Not sure of code numbers. Replaced throttle body and did relearn. Replaced pedal sensor assembly. Checked PCM grounds and fuses 10,21,22,57 ,72,77,78. Disconnected battery for 15min. Engine idles rough, shakes and knocks, and stalls. There is also a surge in the idle.
May 4, 2026 at 4:20 AM
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STRAILER
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Please upload a short video in your response of the problem, so I can see what's going on. We need the codes number so lets check the fuse number 44 in the fuse panel under the hood. This is the fuse that runs the data port, also we should do a compression test so we are not chasing a bad engine. This video will help.

https://www.youtube.com/watch?v=KOxIm1F8AW0

Please go over this guide and get back to us.

May 4, 2026 at 3:21 PM
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AL514
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Hello, if you are having issues with network communications, it would help a great deal to know the "U" codes, which are module communications codes. There must be other modules setting a No Comms with the ECM correct? Another module on the network might be effecting the ECM or a wiring issue with the canbus network. If you can write down the codes, starting with getting communications back up is where you want to start. What type of scan tools or other diagnostic tools do you have?
May 4, 2026 at 3:26 PM
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