2020 Cadillac CT6 Problems: All 6 Known Failures | Milo
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2020 Cadillac CT6 problems: every known failure

All 6 documented failure points for this exact year — what goes wrong, when, what it costs, and how to spot it on a test drive. Free, from Milo's research on this model.

6known failure points
11NHTSA owner complaints
2safety recalls
$7,800worst-case single repair

A brilliant, criminally underrated flagship that GM killed too soon — but the 10-speed transmission recall is a legitimate landmine you must resolve before buying.

Every documented failure, earliest first

Ordered by the mileage the problem typically appears. VERY HIGH confidence means it's tied to a documented NHTSA recall, and 1 of these are rated Critical.

20k–60k mi● Critical$0–$6,500VERY HIGH
10-speed automatic transmission (Hydra-Matic 10L90) internal failure/seizure — subject of NHTSA recall 25V148000
How to catch it: Before purchase, verify with the selling dealer that the recall repair has actually been completed (not just 'scheduled') — parts shortages have left owners driving unrepaired cars for months.
Source: documented (NHTSA recall)
30k–70k mi● Watch$500–$900MODERATE
Twin-turbo 3.0L (LGW) carbon buildup on intake valves from direct injection
Source: multi-source pattern (AI synthesis)
40k–80k mi● Plan$300–$7,800MODERATE
Rear liftgate/trunk latch actuator failing or self-opening, sometimes triggering water-damage repairs
How to catch it: If you notice the hatch popping or not sealing flush, get the latch and weatherstripping inspected immediately — it's cheaper to fix than to repair water-soaked wiring later.
Source: multi-source pattern (AI synthesis)
50k–90k mi● Watch$0–$1,200MODERATE
Super Cruise camera/LIDAR map module and radar calibration faults causing feature disablement
How to catch it: Confirm Super Cruise works fully on a test drive on a mapped highway — many owners report it going dark and never getting fixed due to GM's slow parts/software support post-discontinuation.
Source: multi-source pattern (AI synthesis)
60k–100k mi● Plan$1,200–$2,500MODERATE
Air suspension compressor and leveling sensor wear (on Platinum/Sport trims with Magnetic Ride/adjustable air suspension)
Source: multi-source pattern (AI synthesis)
70k–110k mi● Watch$200–$1,500MODERATE
Brake booster/electronic parking brake and forward collision warning false-positive emergency braking events
How to catch it: Have the front radar/camera calibrated whenever the windshield is replaced — misalignment is the most common cause of phantom autobrake events.
Source: multi-source pattern (AI synthesis)

Buying one of these?

Knowing what breaks is half of it. Milo's full report gives you the other half — for your exact car:

Get the full 2020 Cadillac CT6 report  →
First report free · then $10

Findings blend documented NHTSA recalls and complaints with patterns synthesized from owner communities. Confidence is labeled on every item; an inference is never presented as documented fact. Always inspect the specific vehicle and verify open recalls by VIN before buying.

Full 2020 Cadillac CT6 overview · All researched vehicles · milomotormole.com