What is the 2016 Cadillac CT6 Front Passenger Seat Belt Anchor Bolt Missing From Assembly (Recall 16V687)?

GM recalled 131 U.S. 2016 Cadillac CT6 sedans built on 21-22 July 2016 under NHTSA campaign 16V687 because the bolt that fastens the front passenger seat belt webbing to the anchor plate on the seat may have been omitted during assembly. Without that bolt the webbing can separate… Repairs typically run $0-$0. Severity: high.

What is the 2016-2018 Cadillac CT6 Harsh 1-2 Shifting and Delayed Reverse Engagement on the Eight-Speed Automatic?

Powertrain complaints are the single largest NHTSA complaint category for the 2017 CT6. Owners of 2016-2018 cars report harsh or banging engagement between first and second gear, unpredictable shift quality, a long delay when moving from neutral or park into reverse, and occasion… Repairs typically run $300-$5,500. Severity: high.

What is the 2016-2018 Cadillac CT6 3.0L Twin-Turbo (LGW) Turbocharger Turbine Wheel Failure — GM Service Update 17408?

GM issued Service Update 17408 covering 2016-2018 Cadillac CT6 sedans built with the 3.0L V6 twin-turbo (RPO LGW) after turbochargers were found capable of shedding turbine-wheel material. Owners report a whistle, siren or grinding noise from the turbo area followed by a hard los… Repairs typically run $2,500-$6,500. 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 2016-2018 Cadillac CT6 8L45/8L90 Eight-Speed Torque Converter Clutch Shudder — TSB 18-NA-355 Fluid Exchange?

CT6 sedans with the 8L45 and 8L90 eight-speed automatic (2016-2018 model years) develop a torque converter clutch shudder that owners describe as driving over rumble strips — a vibration or shake at light throttle around 25-50 mph as the converter locks. GM traced it to the origi… Repairs typically run $400-$1,100. Severity: medium.

What is the 2016-2018 Cadillac CT6 Panoramic Sunroof Guide Rail Contact Causes Roof Creak, Tick and Rattle — TSB 16-NA-370?

A widely reported CT6 complaint is a creaking, ticking, popping or double-click noise from the roof and headliner area, heard during turns, over uneven pavement, and when the sunroof operates. GM documented it in TSB 16-NA-370 for 2016-2017 CT6 sedans equipped with the sunroof, a… Repairs typically run $200-$3,000. Severity: low.

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.

Cadillac · Known Issues

2016 Cadillac CT6 Problems: 11 Known Issues

2016 model year · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated August 2026

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According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2016 Cadillac CT6 has 11 documented known issues, with 6 rated critical. The most serious are Excess Adhesive Can Obstruct Child-Seat Anchorages (Recall 18V437), Park and Position Lamps May Be Excessively Bright (Recall 21V759), Front Passenger Seat Belt Anchor Bolt Missing From Assembly (Recall 16V687) ($0-$0 repair), Harsh 1-2 Shifting and Delayed Reverse Engagement on the Eight-Speed Automatic ($300-$5,500 repair), 3.0L Twin-Turbo (LGW) Turbocharger Turbine Wheel Failure — GM Service Update 17408 ($2,500-$6,500 repair) and Engine Oil Cooler Core Leaks Oil Into Coolant, Causing Overheating (2016 LGW Customer Satisfaction Program) ($900-$3,000 repair). Across all issues with published estimates, repair costs range from $150 to $6,500. 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 2016 Cadillac CT6 has 11 documented issues. The most frequently reported are: Excess Adhesive Can Obstruct Child-Seat Anchorages (Recall 18V437), Park and Position Lamps May Be Excessively Bright (Recall 21V759), Front Passenger Seat Belt Anchor Bolt Missing From Assembly (Recall 16V687). Of these, 6 are rated critical and should be addressed promptly.

Is the Cadillac CT6 reliable?

The 2016 Cadillac CT6 has 11 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 6 issues are rated critical: Excess Adhesive Can Obstruct Child-Seat Anchorages (Recall 18V437) and Park and Position Lamps May Be Excessively Bright (Recall 21V759) and Front Passenger Seat Belt Anchor Bolt Missing From Assembly (Recall 16V687) and Harsh 1-2 Shifting and Delayed Reverse Engagement on the Eight-Speed Automatic and 3.0L Twin-Turbo (LGW) Turbocharger Turbine Wheel Failure — GM Service Update 17408 and Engine Oil Cooler Core Leaks Oil Into Coolant, Causing Overheating (2016 LGW Customer Satisfaction Program). 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 $6,500, 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 2016-2018 Cadillac CT6 Excess Adhesive Can Obstruct Child-Seat Anchorages (Recall 18V437)?

On certain 2016-2018 Cadillac CT6 vehicles, excess structural adhesive on the inboard child-seat anchorage bars can interfere with correct child-seat installation. Severity: high.

What is the 2016-2017 Cadillac CT6 Park and Position Lamps May Be Excessively Bright (Recall 21V759)?

Certain 2016-2017 Cadillac CT6 vehicles have park and position lamps that may be excessively bright and fail FMVSS 108, potentially affecting other drivers’ vision. Severity: high.

All 11 Known Issues

Other Cadillac Models

Frequently Asked Questions

What are the most common Cadillac CT6 problems?

Is the Cadillac CT6 reliable?

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

What is the 2016-2018 Cadillac CT6 Excess Adhesive Can Obstruct Child-Seat Anchorages (Recall 18V437)?

What is the 2016-2017 Cadillac CT6 Park and Position Lamps May Be Excessively Bright (Recall 21V759)?

2016-2018 Cadillac CT6: Excess Adhesive Can Obstruct Child-Seat Anchorages (Recall 18V437)#

2016 Cadillac CT6: Front Passenger Seat Belt Anchor Bolt Missing From Assembly (Recall 16V687)#

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

2016-2018 Cadillac CT6: Harsh 1-2 Shifting and Delayed Reverse Engagement on the Eight-Speed Automatic#

2016-2018 Cadillac CT6: 8L45/8L90 Eight-Speed Torque Converter Clutch Shudder — TSB 18-NA-355 Fluid Exchange#

2016 Cadillac CT6: Engine Oil Cooler Core Leaks Oil Into Coolant, Causing Overheating (2016 LGW Customer Satisfaction Program)#

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

2016-2017 Cadillac CT6: Park and Position Lamps May Be Excessively Bright (Recall 21V759)#

2016-2018 Cadillac CT6: 3.0L Twin-Turbo (LGW) Turbocharger Turbine Wheel Failure — GM Service Update 17408#

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

2016-2018 Cadillac CT6: Panoramic Sunroof Guide Rail Contact Causes Roof Creak, Tick and Rattle — TSB 16-NA-370#