Hot oiler

14 hours ago, Onyx610 said:

Thanks hot oiler! This is what we need. You are very correct on the abs wheel speed and correlation with vss. It will cause a derate. He claims to have no codes. Did you have any? 

no i did not - but not sure what may have been turned off in the cumputer 

my mechanic replaced both sensors - but his discription was that they were out of position to the point they could not have worked. i have i not looked at the position of these since he worked on it but i almost wonder if i could have possibly bent a bracket while changing brake shoes 🤷‍♂️

12 hours ago, Onyx610 said:

Sounds like the vecu is losing communication with the vss. 

i had exact same issue, turns out it was the rear axle anti lock wheel speed sensors. if they don’t match up to the transmission speed sensor it causes exactly what you are saying to happen. 

I have a 2009 Granite GU7 w/MP7. I am having an issue with the Speedo randomly dropping out which cuts power. If stop & kill the truck & wait for all the instruments to turn off then start back up the Speedo then works until it randomly does it again. The fault light does not come on. If you are going down the highway when this happens I can just turn the key off until all instruments turn off then turn back on & it returns to normal until next time. 

Very random - 5 minutes, 15 minutes or maybe even 45 minutes apart.