Hello all,
I am writing this thread because I am at my wits end...
I have a 2013 CXU613 day cab with an MP7 and MDrive trans.
All 4 corners of the wheel sensors show the correct speed, abs functions normally, all modules test fine. Issue I am having is the speedometer shows double the speed the truck is going then cuts out all together. Stop the truck for 5-10 seconds(still running and in gear) it will restart and show double the speed etc. It won't go above 14-1500rpm while in gear, which to me says vss is losing signal to vecu.. My issue here is, it is a brand new VSS, brand new tail shaft/output shaft with pressed on tone ring, brand new VECU top plate. I have checked the grounds under the dash, the passthrough conenctor on firewall, removed harness from truck/trans and tested on the bench(read resistance to see if any fluctuation while wiggled) and I have yet to find the culprit. The only active code I have is PSID 211 MID 219 FMI 9. Data Link Abnormal update rate.
I get codes SPN 84FMI 19 and SPN 84 FMI 9.
Please help, I have been trying to figure this out for days...
