2012 Cadillac CTS 3.0L with engine code P0442

Question

I replaced the fuel cap; the light came back on. only had the car for 6 weeks. looking in the trunk battery compartment I found a black vacuum line not connected to anything

Answer 1

HI there,

This code is for a small evap leak. You will likely need a smoke test to locate the source of the leak if the new gas cap didn't resolve the problem. From here there's no way to know if the vac line is involved or not.

Answer 2

P0442 CADILLAC Code - Evaporative Emission Control System Leak Detected Small Leak
Read more: https://www.autocodes.com/p0442_cadillac.html