Home · 2017 Cadillac Ct6-v · Complaints
What 26 owners told NHTSA about the 2017 Cadillac Ct6-v
These are the actual owner complaints behind this car’s reliability verdict, filed with the federal government, unedited. They’re unverified reports, not confirmed defects: read them as leads for your pre-purchase inspection, not a diagnosis.
1 of 26 complaints match · Fuel system · clear filters
Nov 21, 2025Fuel system
My CT6 had a default engine light on,.Dealer reports broken EVAP line.Car has never been in an accident or damaged.Upon inquiry dealer reports no issues known to them with this problem.However ,this same vehicle had transmission issue when purchased new and the dealer stated same findings.Then recall was issued and transmission was repaired for a known problem and repaired under a recall notice.My concern is this may be similar situation with the fuel EVAP system.The vehicle is my primary car and a fuel vapor leak is a grave concern to me and I believe posses a risk, especially as the replacement parts are unavailable at this time.I have filed an inquiry with Cadillac/Gm #82543696 Steven Maffei(AI inquiry reveals known and past problems with Cadillac EVAP systems)
NHTSA ODI 11700820
Working with the data? Download all 26 complaints as CSV · fetched from NHTSA July 21, 2026
How to use these: a complaint is one owner’s report, filed voluntarily and published unverified. Patterns matter more than any single story. If several owners describe the same failure at similar mileage, put that system at the top of your
pre-purchase inspection list. Back to the
full 2017 Cadillac Ct6-v verdict →