Cadillac · Known Issues

2019 Cadillac CT6 Problems: 7 Known Issues

2019 model year · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated August 2026

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2019 Cadillac CT6 has 7 documented known issues, with 4 rated critical. The most serious are Turn Signals May Not Cancel Automatically (Recall 19V117), 10-Speed Transmission Damage Can Cause Wheel Lock-Up (Recall 25V148), ABS and Stability Control Can Disable Without Warning Lamps (Recall 19V889) and Rear Seat Belt Automatic Locking Retractor Fails to Lock for Child Seats (Recall 18V673) ($0-$0 repair). Across all issues with published estimates, repair costs range from $150 to $1,500. DIY maintenance guides at au7o.io.

Frequently Asked Questions

What are the most common Cadillac CT6 problems?

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2019 Cadillac CT6 has 7 documented issues. The most frequently reported are: Turn Signals May Not Cancel Automatically (Recall 19V117), 10-Speed Transmission Damage Can Cause Wheel Lock-Up (Recall 25V148), ABS and Stability Control Can Disable Without Warning Lamps (Recall 19V889). Of these, 4 are rated critical and should be addressed promptly.

Is the Cadillac CT6 reliable?

The 2019 Cadillac CT6 has 7 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 4 issues are rated critical: Turn Signals May Not Cancel Automatically (Recall 19V117) and 10-Speed Transmission Damage Can Cause Wheel Lock-Up (Recall 25V148) and ABS and Stability Control Can Disable Without Warning Lamps (Recall 19V889) and Rear Seat Belt Automatic Locking Retractor Fails to Lock for Child Seats (Recall 18V673). Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

How much does it cost to fix common Cadillac CT6 problems?

Repair costs for known Cadillac CT6 issues range from $0 to $1,500, depending on the specific problem and whether you choose DIY or professional repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 2019 Cadillac CT6 Turn Signals May Not Cancel Automatically (Recall 19V117)?

On certain 2019 Cadillac CT6 vehicles, steering-wheel rotation may not cancel the turn signal, which can mislead pedestrians and other drivers. Severity: high.

What is the 2019-2020 Cadillac CT6 10-Speed Transmission Damage Can Cause Wheel Lock-Up (Recall 25V148)?

Certain 2019-2020 Cadillac CT6 vehicles equipped with a 10-speed transmission can develop internal transmission damage that may cause the wheels to lock while driving. Severity: high.

What is the 2019 Cadillac CT6 ABS and Stability Control Can Disable Without Warning Lamps (Recall 19V889)?

On certain 2019 Cadillac CT6 vehicles, an electronic brake-control-module software error can disable ABS and stability control without illuminating the corresponding warning lamps. Severity: high.

What is the 2018-2019 Cadillac CT6 Rear Seat Belt Automatic Locking Retractor Fails to Lock for Child Seats (Recall 18V673)?

GM recalled certain 2018-2019 Cadillac CT6 vehicles under NHTSA campaign 18V673 because second-row or third-row seat belt retractor assemblies may not switch into automatic locking mode when the belt is pulled fully out of the retractor. Automatic locking retraction is the mechan… Repairs typically run $0-$0. Severity: high.

What is the 2016-2020 Cadillac CT6 Parasitic Battery Drain From Keyless Entry Module Polling for Approach Lighting?

CT6 owners report the 12-volt battery going flat after the car sits for a few days, sometimes flat enough that the electronic shifter and door handles will not respond and the car needs a jump. GM documents a cycling battery draw on 2016-2020 CT6 vehicles in preliminary informati… Repairs typically run $150-$900. Severity: medium.

What is the 2016-2020 Cadillac CT6 Failed Thermostat Sets P0128, Forces Cooling Fans to Run Constantly and Disables the A/C?

CT6 owners report the radiator cooling fans running at high speed all the time — including after shutdown — with the coolant temperature gauge reading cold, and in many cases weak heater output and the A/C refusing to engage. The root cause is a thermostat that fails stuck open. Repairs typically run $350-$800. Severity: medium.

What is the 2016-2020 Cadillac CT6 Rear Camera Mirror Module Failure — Blank, Blurry or Distorted Streaming Mirror Image?

The CT6's rear camera mirror streams a live video feed from a roof-mounted rear camera onto the mirror glass. Owners report the feed going blank, showing a grainy, pixelated or heavily distorted picture, or losing focus so badly at night and in rain that the mirror is unusable. G… Repairs typically run $400-$1,500. Severity: low.

All 7 Known Issues

2018-2019 Cadillac CT6: Rear Seat Belt Automatic Locking Retractor Fails to Lock for Child Seats (Recall 18V673)#

2016-2020 Cadillac CT6: Rear Camera Mirror Module Failure — Blank, Blurry or Distorted Streaming Mirror Image#

2019 Cadillac CT6: Turn Signals May Not Cancel Automatically (Recall 19V117)#

2019-2020 Cadillac CT6: 10-Speed Transmission Damage Can Cause Wheel Lock-Up (Recall 25V148)#

2019 Cadillac CT6: ABS and Stability Control Can Disable Without Warning Lamps (Recall 19V889)#

2016-2020 Cadillac CT6: Parasitic Battery Drain From Keyless Entry Module Polling for Approach Lighting#

2016-2020 Cadillac CT6: Failed Thermostat Sets P0128, Forces Cooling Fans to Run Constantly and Disables the A/C#

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