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Cadillac · Known Issues

2019 Cadillac CT6 Problems: 7 Known Issues

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

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Issue summary

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.

In This Article

  • CT6 Safety/Recalls2
  • CT6 Exterior1
  • CT6 Transmission1
  • CT6 Brakes1
  • CT6 Electrical1
  • CT6 Cooling1
  • Recalls8
  • FAQ
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In This Article

  • Safety/Recalls2
  • Exterior1
  • Transmission1
  • Brakes1
  • Electrical1
  • Cooling1
  • Recalls8
  • FAQ

All 7 Known Issues

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ALL YEARS20202019201820172016

On the 2018-2019 Cadillac CT6, 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 mechanism that holds a child seat tight against the seat back; if it does not engage, the child seat can move freely on its belt and will not be properly restrained in a crash. Owners notice it directly: the belt pulls all the way out but never clicks into the ratcheting mode and simply retracts normally. Not every seating position on a given car is affected, so an owner may be able to move the child seat to a different position while awaiting the repair.

Common Symptoms

  • Rear seat belt does not lock when pulled fully out
  • Child seat can be moved after belt is cinched
  • No ratcheting sound from the retractor

How to Fix

Free recall remedy under NHTSA campaign 18V673 — dealers inspect the rear seat belt retractors and replace any that fail to enter automatic locking mode, at no charge. Verify the recall is closed on a used CT6 by VIN at nhtsa.gov/recalls before installing a child seat, and test each rear position by pulling the belt fully out and listening for the ratchet.

Typical repair cost:$0 - $0

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Community Reported
High ConfidenceVerifiedReviewed Aug 2026

On the 2016-2020 Cadillac CT6, 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. GM addressed the image-quality complaint in TSB 17-NA-375 for grainy, distorted or pixelated rear vision camera images on the CT6, but a share of cars have an outright module or camera failure that dealers resolved by replacing the assembly. Compounding it, using the rear washer sprays fluid onto the camera lens and smears it, and moisture accumulation defeats the lens's hydrophobic coating in wet, humid weather.

Common Symptoms

  • Rear camera mirror screen goes black
  • Grainy, pixelated or distorted image
  • Image out of focus, especially at night or in rain
  • Mirror feed cuts out intermittently

How to Fix

Clean and inspect the camera lens and wiring first, then use the symptom and module diagnostics to distinguish the inside rearview-mirror display from the roof-mounted camera. No single retail part safely covers both branches or every CT6 option code.

Typical repair cost:$400 - $1,500

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Low ConfidenceVerifiedReviewed Aug 2026

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

Common Symptoms

  • Open safety recall
  • Turn signal remains active after a turn

How to Fix

Check the VIN and recall completion history. Cadillac dealers replace the turn-signal switch under recall N182207090.

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High ConfidenceVerifiedReviewed Jul 2026

On the 2019-2020 Cadillac CT6, 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.

Common Symptoms

  • Open safety recall
  • Unexpected wheel lock-up risk

How to Fix

Check the VIN and campaign status. Cadillac dealers install transmission-control-module monitoring software under recall N242480630; follow the campaign instructions if the software detects damage.

Find a Cadillac dealer

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Call to confirm they service Cadillac vehicles and check your VIN, recall eligibility, parts availability, and appointment options.

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High ConfidenceVerifiedReviewed Jul 2026

On the 2019 Cadillac CT6, 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.

Common Symptoms

  • Open safety recall
  • ABS or stability control may be unavailable without a warning

How to Fix

Check the VIN and campaign history. Cadillac dealers reprogram the electronic brake control module under recall N192268090.

Find a Cadillac dealer

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Call to confirm they service Cadillac vehicles and check your VIN, recall eligibility, parts availability, and appointment options.

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High ConfidenceVerifiedReviewed Jul 2026

On the 2016-2020 Cadillac CT6, 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 information bulletin PIC6359A: the keyless entry control module repeatedly wakes and polls for the key fob transmitters to support the approach-lighting feature, and the repeated wake cycles keep total draw above the acceptable sleep threshold. Other modules that fail to time out (infotainment, security) produce the same symptom, so the offending module has to be identified rather than assumed.

Common Symptoms

  • Dead battery after the car sits several days
  • Repeated jump-starts needed
  • Electronic shifter or door handles unresponsive
  • Multiple warning messages on wake-up
  • Battery saver mode message

How to Fix

Measure and isolate the key-off draw before replacing anything. Apply the applicable module calibration first; replace and program a module only when the draw remains and the diagnostic branch confirms it.

Typical repair cost:$150 - $900

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Community Reported
Medium ConfidenceVerifiedReviewed Aug 2026

On the 2016-2020 Cadillac CT6, 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. The engine never reaches its target coolant temperature in the calibrated time, so the ECM sets P0128 (coolant temperature below thermostat regulating temperature), defaults the temperature gauge to the cold end, commands the A/C off, and commands the cooling fans on as a protective default. Owners frequently mistake this for a fan relay, a fan module or a bad temperature sensor and replace those first.

This issue also affects: Buick Encore GX, Cadillac Allante, Cadillac Catera

Common Symptoms

  • Cooling fans run constantly, including after shutdown
  • Temperature gauge reads cold or does not rise
  • A/C will not engage
  • Poor heater output
  • Check engine light

How to Fix

Confirm P0128 and commanded-versus-actual coolant temperature, then replace the thermostat housing for the exact engine and bleed the cooling system. The CT6 uses different housings across its 2.0L, V6 and 4.2L engines.

What you need to fix it

Only diagnosis- and fitment-reviewed repair parts are linked here.

  • Genuine GM 25201447 engine-coolant thermostat housing
    $61

    2016-2019 Cadillac CT6 2.0L four-cylinder only; direct-fit housing. Not for either V6 or the 4.2L V8.

    GMPartsGiant
  • Genuine GM 12678784 / superseding 12741007 engine-coolant thermostat housing
    $46

    Verify VIN and the current superseding number before ordering.

    GMPartsGiant
  • Genuine GM 12671038 engine-coolant thermostat housing
    $43

    2019-2020 Cadillac CT6 4.2L twin-turbo V8 only; not for the 2.0L or either V6. Price/availability: $42.72 when reviewed

    GMPartsGiant

As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.

Typical repair cost:$350 - $800

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Community Reported
Low ConfidenceVerifiedReviewed Aug 2026
NHTSA Recalls8 recalls

TIRES:PRESSURE MONITORING AND REGULATING SYSTEMS

General Motors LLC (GM) is recalling certain 2020 Cadillac CT6 vehicles equipped with dealer-installed accessory 20" x 8.50" wheels (RPO 5JO or SHH). The tire pressure monitoring system (TPMS) sensors use the incorrect wireless radio frequency and cannot illuminate the low pressure warning light when the tire pressure drops below the recommended level. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 138, "Tire Pressure Monitoring Systems."

Campaign #19V73100015/10/2019

POWER TRAIN:AUTOMATIC TRANSMISSION

General Motors LLC (GM) is recalling certain 2019-2020 Cadillac CT6, 2020-2021 CT4, CT5, and 2020-2022 Chevrolet Camaro vehicles equipped with a 10-speed transmission. The transmission may become damaged internally and cause the wheels to lock-up.

Campaign #25V14800006/03/2025

SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:ABS WARNING LIGHT

General Motors LLC (GM) is recalling certain 2019 Chevrolet Silverado 1500, Cadillac CT6, and GMC Sierra 1500 vehicles. Due to an Electronic Brake Control Module (EBCM) software error, the vehicle's Electronic Stability Control (ESC) and Antilock Brake System (ABS) may become disabled. Furthermore, if this specific error occurs, the vehicle's diagnostics will not illuminate the instrument cluster ESC and ABS malfunction warning lights. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 126, "Electronic Stability Control" and 135, "Light Vehicle Brake Systems."

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Other Cadillac Models

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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.

Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.

Data compiled from NHTSA recalls, manufacturer TSBs, automotive forums, and AI-assisted research. No aggregated owner-report counts available for this vehicle yet.

Campaign #19V88900012/12/2019

EXTERIOR LIGHTING:TURN SIGNAL:SWITCH

General Motors LLC (GM) is recalling certain 2019 Cadillac CT6 vehicles. Rotation of the steering wheel will not automatically cancel the turn-signals from flashing. As such, these vehicles fail to comply with Federal Motor Vehicle Safety Standard (FMVSS) number 108, "Lamps, Reflective Devices and Associated Equipment."

Campaign #19V11700021/02/2019

SEAT BELTS:REAR/OTHER

General Motors LLC (GM) is recalling certain 2018-2019 Cadillac CT6, Escalade ESV, Chevrolet Suburban, Volt, and GMC Yukon XL vehicles. Certain second-row or third-row rear seatbelts retractor assemblies may not automatically lock when the seatbelt is fully pulled out of the retractor, possibly preventing a child seat from being properly secured. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 208, "Occupant Crash Protection."

Campaign #18V67300026/09/2018

+ 3 more recalls. Check all on NHTSA.gov

Enter your VIN at NHTSA.gov to check recalls specific to your vehicle.

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.