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Jeremy, Certified Truck/Bus Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 3359
Experience:  ASE Med/HD Truck Technician, NATEF Diesel Engines and Electrical/Electronics Technician, EPA 608/609 HVAC Certified, Steering/Suspension and ABS/Brakes Technician
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Have a volvo 2000, d12, have codes controller,

Customer Question

Hi, have a volvo 2000, d12, have codes for cab controller, thats turn on only when i slow down on scales or stop on traffic light ! Computer saying: cab controller road speed electrical fault, also engine has same soad speed code, but saying unknown, Plus one code saying road speed comunication error ? When i have this code: speedometer doesn't work, engine break doesn't work, cruise control doesnt work, plus when i idle it will cut the idle from 700- 750 back to 500 like i haven turn on the cruise ! All wires are checked already, everything looks ok !
The code will disappear after i turn off truck for 15-20 min !
Submitted: 2 years ago.
Category: Medium and Heavy Trucks
Expert:  Jeremy replied 2 years ago.
My name is ***** ***** I will assist you. Get a prybar and see if that yoke is loose on the output shaft for your transmission. If that big nust is loose, it will cause that for the gear inside will spin freely when slowing down and give the error code. If it is tight, check the sensor for the output shaft. Wither it is bad of the tone ring/gear inside has an issue and needs to be checked. That is common on the Volvo trucks.