We present an analysis of C IV observations in the inner (Rproj ~ 25-130 kpc) circumgalactic medium (CGM) of a novel sample of eight z ∼ 0, L ≈ L* galaxies in the COS-Holes survey (Garza et al. 2024). The galaxies in this stellar-mass-controlled sample host supermassive black holes (SMBHs) with dynamically-measured masses spanning nearly two orders of magnitude; this allows us to compare our results with models of galaxy formation where the integrated feedback history from the SMBH alters the CGM over long timescales. C IV does not show obvious variation as a function of the SMBH mass. In contrast, the specific star-formation rate (sSFR) is highly correlated with the C IV content of the CGM. We augment the COS-Holes sample with early results from the CIViL* survey (PID#17076) and find that C IV exhibits a dichotomous relationship in L* star-forming and passive galaxies, similar to that of OVI. Our results show that CIV is an essential tracer of the physical conditions and ionization structure of the CGM and can reveal the processes responsible for quenching galaxies.