
Gen 2 2008–2013
Under the dashboard, driver side, left of steering column, above parking brake pedal.
Four generations, 2003–2019. Pick yours.
2014–2019
Illustration — use it to know where to look.
Under the dashboard, driver side, left of steering column.
Also on this CTS
2012–2012
Illustration — use it to know where to look.
Driver's side, under the lower dash to the left of the steering column, below the instrument-panel lip and just above the pedals. The 16-pin connector faces downward and is exposed — no cover to remove, though it sits up out of direct sight, so find it by reaching under the dash or with a torch from the footwell. Same location on the CTS sedan, coupe and Sport Wagon.
Also on this CTS

Under the dashboard, driver side, left of steering column, above parking brake pedal.
Under the dashboard, driver side, left of steering column, above the parking brake pedal.
Questions
Step-by-step add-key and all-keys-lost procedures for every CTS, which of your tools will do it, and what catches people out.
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