Hello & Welcome to JA,
Which engine is in your Cadillac ? 2.8,3.0,3.2,2.6 or 4.6
Crankshaft Position Sensor Replacement
In the engine compartment, on the left side of the engine block
Tighten Tighten the crankshaft position sensor bolt to 10 N·m (89 lb in).
You say left side, lets use driver or passenger?