also engine light came on,and engine ot when it is not
Service Lane Departure System light comes on on 2008 Cadillac STS-V
agree with both
2 more answers , 1 more comment
Check it for code history..
You will need someone to check all of the onboard computers for codes. Any module that is a part of that system that detects a fault will cause the system to shut down and display that warning.