Serial Monitor problems

Hello,
My first items arrived and I am trying to build my first project. i've watched so many tutorials but this was something unexpected.
I am making a can reader for my car through OBD2 using arduino UNO and CAN shield. I've compiled the code successfuly (using a pre-written code) and uploaded it to the UNO board. Things seems to be okay untial I open the serial monitor and I see these symbols

Enter setting mode success

set ress!!

CAN BUS Shield init ok!

1⸮_⸮X⸮⸮⸮⸮4]$-⸮K⸮

sometimes I get pretty better output but not the result I want

Enter setting mode success

set rate --------

Get data from ID: 229

49 24 48 32 26 C 49 24 9


Get data from ID: 229

49 24


Get data from ID: 229

49 24 48 32 26 C 49 24 9

⸮O⸮eX⸮⸮⸮⸮?.ڒ⸮$M⸮⸮K]K%⸮⸮KU\қ:,⸮(⸮⸮⸮,A⸮lF4⸮⸮, ⸮⸮Q4ʞ⸮;.⸮P⸮ٛ⸮K⸮d ⸮⸮⸮U6

⸮⸮J⸮қP4(⸮⸮$M⸮8i⸮L0H⸮K⸮,⸮ۛ@)⸮|⸮d i⸮қ⸮,⸮y⸮U

Your post is missing all needed details
1)
A wiring diagram; photo of pencil drawing is fine.
2)
Your code, posted between
** **[code]** **
and
** **[/code]** **