Looking for some help here all. I have a 2011 3500hd cab and chassis, lml/lgh(vin codes as a lgh but isn’t the van style). Acceleration on a steep grade or left turn I get a service trailer brake, loss of all gauges, flashing abs light and the engine cuts out briefly. I will get a code if I get drive it and let it happen several times. I get codes u0100 and p0700. Nothing else. No codes stored in the tcm. I’ve looked at both front abs sensors on a scan tool, don’t seem to lose them at all. It will not act up when the truck is cold. Only thing else that seems to happen regularly is when accelerating the Speedo is jumpy till it hits 40 mph then levels out. I’ve gone over the harness for rubbing issues and don’t see anything. Batteries are good, alternator is good. Started about 4 months ago. Only thing that changed prior to this was new hubs on the front end. Any help is appreciated
Lml/lgh crazy electrical issues
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Yeah thought that too based off the not doing it when cold. Swapped and it does the same thing.
What’s the rest of the codes? P0700 means the tcm requested the MIL so we need the codes out of it and in the order they are. Need any and all other additional codes too.
What/how did you swap the tcm?
What/how did you swap the tcm?
That’s the crazy part no other codes exist in the tcm module. Just the P0700. Bought a new tcm had it programmed to my vin and swapped it in. Didn’t change a thing.
I’m going to drive it tomorrow and get some more data. I can go into each module and it shows no additional codes. Using an older genesis evo and a snap on Solus, I can see the modules.
Drove it today, got it to act up. I was able to read all modules. Today it didn't kick a PO700 code. Had a U0100, U0121,U0137,U0073 Stored. I clearly have an issue on the Data network in the truck. Not sure why it'd be intermittent, why it happens in a left turn or incline and never does it when cold. going to look at the BCM wiring and start to Isolate next.