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My 2500HD of 118K miles starting throwing network codes this week.
All stock...
The truck runs fine most of the day, then without warning the trans will start shifting at odd RPM's, power drops a bit... and the check engine light may or may not illuminate.
I'm getting:
U2104 CAN Bus Reset Counter Overrun
U2105 ECS Comm lost
U1800 FICM comm loss
U1152 HVAC Comm loss
U2106 TCS comm loss

I've reseated all appropriate fuses and cables.
I cannot locate corrective actions for the network errors.
Does AllData provide this type of info?
 

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Discussion Starter · #6 ·
Thanks for the tips guys! I replaced both batteries. One was only pushing 404CCA's. Still had the orig. problem.
Since I was leaving town and running out of time, I resulted to the dealer.. Tech found chaffed wire at the FICM bracket where a previous tech (previous owner) must had performed inj. service and forgot to secure the harness which was rubbing on the bracket. No more codes since.
 
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