Hello. On my volvo xc70 2.4 Diesel '07 there's problem, which I can't find solution to. Sometimes, while driving speed higher than 20 km/h ( 12-13 mph) and higher rpms, i hear a hit in the gearbox, then i receive anti-skid needs service message, and it automatically shifts in to 3rd gear and won't go up or down. Shutting car off and on doesn't help, and clearing stored fault codes helps for some time, but it always comes back at higher rpms. The fault codes i always find is these two:
0A31 - control module signal missing.
23B0 - second injection valve signal missing.
I Switched second injection valve with the third, it still shows that second injection valve is faulty, even though it's switched. Right now I am lost, don't even know what to do. Thought about purchasing new engine wires, how do you think, would it help? Thanks for any sort of opinion or even solutions.
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Hi having same problems in an 07 xc90 wonderimg if you found any soloutions or what the problem was ? Cheers

 

If a sensor in the transmission management system or ABS (anti-lock braking system) sends an incorrect signal to the ECU, this can cause these erratic behaviors. This could also explain why the car shifts into 3rd gear and no longer changes gear

 

So it was engine wiring, i guess somewhere behind wire armour there was faulty wire, and it provoked all of the problems above. That's why even when switched fuel injectors, fault codes remained the same.