Volvo 670, 2006year TCS problem

Hi guys, I have a Volvo 670, 2006,
With Volvo D12 engine.
From one week I am driving with the TCS light on,
on my dashboard. The truck is moving but is like something pushing it back or stopping it. I read some info about the same problem at the forum that says might be from the alignment. I put brand new steer tires and right now I am doing the alignment if the problem is still there when I take my truck from alignment, is there anyone who can help me with some more information about what the problem could be.

Thanks and I appreciate any help.

PS. Oo, there is one more thing, when I turn the switch on without starting the truck I am waiting around 10 second the truck is doing some tests I guess and at the end I can hear a noise like (pssst) air is coming out from some of the valves but since I have the TCS problem I can't hear that noise anymore.
Thanks, I appreciate

 

Thank you Nasriza, I get my truck back after the alignment same light on (TCS) the fault code is
MID 136 SID 89 FMI 2

 

Thank you very much is there more information that you can give me about that sensor like where it is located? Is it easy to change? And how to do the calibration? If you know of course.
Thank you. I appreciate.

 

Thank you very much