I-shift faulty

PTO solenoid disconnected. Check truck configuration, may be someone removed and sold all PTO stuff (pump, solenoids, tank) and use this trucktor to tow flatbed for example)))) was used with dampers before

 

PTO - power take off. For example this solenoid actuater pump of dump body ore mixer...

http://en.wikipedia.org/wiki/Power_take-off

what configuration of this truck?

 

try to run I-shift calibration procedure with VCADs ore TT. Any faults would be found and fixed

 

I sugest worn synchro ore bad tranny brake

 

only ABS sensors are important, becouse TCU compares front and rear axle speed to avoid shifting in sharp curves, so EBS data via J1939 is used

 

I had to have sensor in tranny replaced last summer. The tranny would go up and down gears all day long till I stopped then it wouldn't engage in gear. After a few seconds it would engage in gear. Sometimes I had to shut off engine and restart before it would go in gear. It took 5 Volvo dealers before the problem was fixed. They changed everything out but the kitchen sink. Bad news you have to pay for these #### techs to learn on your truck.
I had every excuse from weak batteries, weak starter I had , 4 new batteries installed, new starter, clutch solenoid valve, transmission wiring harness, and lastly the transmission sensor, which cured the problem.
In order to install that sensor they have to drop the transmission.