So I have a butt load of DTC's. Which of these should I be concerned about. Check engine light is not on. All of this crap shows up immediately even if I reset them.

[TCM] U1000 - Class 2 Communication Malfunction (History) (Immature)
[TCM] U1255 - Class 2 Communication Malfunction (History) (Immature)
[TCM] C0300 - Rear Speed Sensor Malfunction (History) (Immature)
[TCM] C0305 - Front Speed Sensor Malfunction (History) (Immature)
[TCM] C0306 - (History) (Immature)
[TCM] C0321 - (History) (Immature)
[TCM] C0327 - Encoder Circuit Malfunction (History) (Immature)
[TCM] C0359 - (History) (Immature)
[TCM] C0374 - General System Malfunction (History) (Immature)
[TCM] C0379 - (History) (Immature)
[TCM] C0550 - ECU Malfunction (History) (Immature)
[TCM] B0790 - (History) (Immature)
[TCM] B2725 - ATC Mode Switch Circuit Malfunction (History) (Immature)
[TCM] U1301 - Class 2 Short to Battery (History) (Immature)
[Brake] C0227 - LF Wheel Speed Signal Erratic (History)
[Brake] C0281 - Brake Switch Circuit (History)
[Brake] C0226 - LF Wheel Speed Signal Missing (History)
[Brake] C0225 - LF Wheel Speed Sensor Circuit Open (History)
[Unknown] B0951 - (History) (Immature)
[Unknown] B2610 - (History) (Immature)
[Unknown] B2615 - (History) (Immature)
[Unknown] B2625 - (History) (Immature)
[Unknown] B2948 - Security System Sensor Power CKT High (History) (Immature)
[Unknown] B2961 - (History) (Immature)
[Unknown] U1000 - Class 2 Communication Malfunction (History) (Immature)
[Unknown] U1161 - Loss of PDM Serial Data (History) (Immature)
[Unknown] U1160 - Loss of Communications with DDM (History) (Immature)
[Unknown] U1096 - Loss of Communications with IPC (History) (Immature)
[Unknown] U1152 - Loss Of ACM Serial Data Communication (History) (Immature)
[Unknown] B1440 - (History) (Immature)
[Convenience] U1000 - Class 2 Communication Malfunction (History) (Immature)
[Convenience] U1000 - Class 2 Communication Malfunction (History) (Immature)
[Convenience] B1760 - Driver Seat Asm Rearward Switch CKT Malf (History) (Immature)
[Convenience] B2425 - (History) (Immature)
[Convenience] U1000 - Class 2 Communication Malfunction (History) (Immature)
[Convenience] U1305 - Class 2 Data Link Low or High (History) (Immature)
[Convenience] U1161 - Loss of PDM Serial Data (History) (Immature)
[Convenience] U1160 - Loss of Communications with DDM (History) (Immature)

 

well afaik since all of them are history then none of them are currently an issue. did something get unplugged, powered on, then fixed?

 

Most of that stuff has been there for a long while, but since it runs fine I haven't worried about it.

 

Mine has a bunch of crap like that too.... I dont know what to make of it... Some of the **** listed I dont think I even have... haha

 

Take the ground under the cab loose. Its near the cab mount under the drivers door. Clean the frame where it attaches, clean the eyelet on the end of the wire and tighten it back up. When this ground is not making a good connection power can backfeed into your serial data circuit. That will set many of the codes you are seeing. It doesn't have to be loose for this to happen I have seen many trucks that the frame coating insulates well enough that when the bolt gets a little corroded it causes this.

 

Sounds like a good possiblility for my truck. I'll give that a try.

 

I wish there were a way to clear all those old things in history.

 

I am having this same issue, did this ever get resolved?

 

I haven't checked it in a while but I expect that most of them are still there.
I'm not having any problems with how the truck runs though so I gave up worrying about it.

 

I believe you can clear the history codes with EFILive