What causes the transmission to go into limp mode? on 2001 Suzuki Grand Vitara

Where are the eletrical sensors for the transmission located?

2 answers 1 comment
SCAN CODES AND POST OR SEEK A FREE DIAG THRU AAMCO AND POST FINDINGS
Obd2 codes are P0153, P0430 & P0001.
I'm not sure if it makes any difference but the vehicle is not a. 2001grand vitara, it is actually a 2001 xl7, when I went to post there was no selection for the xl7.
Any "fault" will cause the trans to go into limp mode. Recommend a qualified shop check that out so you do not waste $$$ guessing.