Certain vehicles listed above, may have a condition where the transmission control valve has worn, resulting in a gradual loss of pressure within the valve. The effects can cause harsh shifting, setting a service engine soon message, reduced engine performance or P0747 diagnostic trouble code. This special coverage covers vehicles that return after TCM Update Product Safety N242480630 and have P0747 condition described above for a period of 15 years or 150,000 miles (240,000 km), whichever occurs first, from the date the vehicle was originally placed in service, regardless of ownership. For vehicles covered by Vehicle Service Contracts, all eligible claims with repair orders on or after Marc
full bulletin at NHTSA ↗2019 Cadillac CT6 powertrain problems
moderate 12 complaints filed with NHTSA · avg repair $2,500 · see powertrain across all vehicles →
Complaints
12
Recalls
0
Avg fix
$2,500
When does it fail?
Of the 12 powertrain complaints filed for the 2019 Cadillac CT6, here's the actual mileage breakdown — failures cluster heaviest at 50,000-75,000 mi.
0-25k
25-50k
50-75k
75-100k
100-125k
125-150k
150k+
Each bar shows the share of total complaints filed at that mileage range. Peak failure window highlighted. Some owners report problems earlier; some make it well past 150,000 miles symptom-free. Maintenance habits and driving conditions shift the curve as much as mileage alone.
What stands out
Among the 5 model years of Cadillac CT6 in our records for powertrain problems, this one ranks #2 by owner-complaint volume.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering powertrain on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
Certain vehicles listed above, may have a condition where the transmission control valve has worn, resulting in a gradual loss of pressure within the valve. The effects can cause harsh shifting, setting a service engine soon message, reduced engine performance or P0747 diagnostic trouble code. This special coverage covers vehicles that return after TCM Update Product Safety N242480630 and have P0747 condition described above for a period of 15 years or 150,000 miles (240,000 km), whichever occurs first, from the date the vehicle was originally placed in service, regardless of ownership. For vehicles covered by Vehicle Service Contracts, all eligible claims with repair orders on or after Marc
full bulletin at NHTSA ↗This preliminary informational (PI) bulletin provides information to dealership personnel that may be helpful when addressing underbody component corrosion with customers.
full bulletin at NHTSA ↗Certain vehicles listed above, may have a condition where the transmission control valve has worn, resulting in a gradual loss of pressure within the valve. The effects can cause harsh shifting, setting a service engine soon message, reduced engine performance or P0747 diagnostic trouble code. This special coverage covers vehicles that return after TCM Update Product Safety N242480630 and have P0747 condition described above for a period of 15 years or 150,000 miles (240,000 km), whichever occurs first, from the date the vehicle was originally placed in service, regardless of ownership. For vehicles covered by Vehicle Service Contracts, all eligible claims with repair orders on or after Marc
full bulletin at NHTSA ↗This bulletin provides information on identifying Non-GM Engine Calibrations for Gasoline Engines using the Tech 2 or GDS 2.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
Owners of the 2019 Cadillac CT6 describe a cascade of powertrain failures tied to NHTSA campaign 25V148000. The most dangerous issue: vehicle rollback after parking on an incline. Owners report the car rolls backward 1–2 feet after they exit, requiring them to apply the brake to prevent injury. The column shifter gets stuck in neutral or refuses to engage park; owners have to work the shifter back and forth repeatedly before drive or park locks in.
At higher mileage (77K–84K miles), owners report wheels locking up at highway speeds (50–75 mph), causing sudden loss of power and requiring emergency coast-to-shoulder stops. One owner had the rear differential replaced and transmission solenoid code P0747 retrieved. Another owner's differential was replaced, but after recall service, the transmission began shifting hard with check engine lights.
Dealers consistently report that recall repair parts are unavailable, halting repairs indefinitely. Multiple owners state GM exceeded reasonable timelines without providing a fix. One owner attempted to shift from neutral to drive and needed multiple push-to-start attempts and shifter manipulation just to move the vehicle. The pattern is clear: transmission and differential components are failing under normal driving, and the recall remedy remains unavailable months after notification.
Same Cadillac CT6 powertrain reports on nearby years: 2017
Failure modes owners describe
Vehicle rollback on incline / unable to hold park
Vehicle rolls backward 1–2 feet after parking on incline. Driver attempts to exit; has to apply brake to stop vehicle. Column shifter may be stuck in neutral or refuse to shift to park. Push-to-start button requires multiple presses; shifter may need to be moved back and forth repeatedly before vehicle engages drive or park.
When: 50,000–58,000 miles
Symptoms owners cite: Vehicle rolls backward when parked on incline; Column shifter stuck in neutral; Shifter difficult to move to park; Push-to-start button unresponsive or requires multiple attempts; No warning lights at time of failure
Recalls/TSBs owners mention: NHTSA Campaign Number 25V148000 (Power Train) issued. Recall repair parts not yet available as of complaint dates. Dealers unable to repair; manufacturers directed dealers to advise owners parts are unavailable.
Transmission hard shifting / shuddering
Transmission shudders and shifts hard during normal driving at various speeds. Check engine warning light may illuminate. Dealer diagnosis identified fractured transmission control valve related to recall 25V148000.
When: 65,000 miles; check engine light present before recall issued
Symptoms owners cite: Transmission shudders while driving; Hard shifting; Check engine warning light illuminated
Repairs/costs cited: Dealer diagnosed fractured transmission control valve; vehicle not repaired due to unavailable recall parts.
Recalls/TSBs owners mention: NHTSA Campaign Number 25V148000 (Power Train). Dealers confirmed failure was recall-related but repair parts unavailable.
Wheels lock up / transmission failure during driving
While driving at highway speeds (50–75 mph), wheels lock up suddenly. Vehicle sways side to side and loses power, forcing driver to coast to roadside. Traction control warning light may illuminate; 4WD service message may appear. One case diagnosed as rear differential failure with transmission solenoid code; transmission later diagnosed as failed and requiring replacement.
When: 77,000–84,000 miles
Symptoms owners cite: Wheels lock up during driving; Vehicle sways side to side; Vehicle loses power and decelerates; Traction control warning light illuminated; 4WD service message displayed; Vehicle lagging at 50 mph
Codes mentioned: P0747 (Transmission Solenoid Stuck Open)
Repairs/costs cited: One case: rear differential replaced by independent mechanic. Transmission later required replacement but not completed by dealer. Other cases: transmission failure diagnosed; vehicle not repaired.
Recalls/TSBs owners mention: NHTSA Campaign Number 25V148000 (Power Train) / Manufacturer Recall N242480630. Recall repair parts not available.
Hard shifting after recall repair
After recall repair under campaign 25V148000 was performed, vehicle developed hard shifting with check engine warning light. Dealer unable to diagnose or repair the issue.
When: 77,000 miles, post-recall repair
Symptoms owners cite: Hard shifting after recall repair; Check engine warning light illuminated post-repair
Repairs/costs cited: Vehicle returned to dealer but not diagnosed or repaired.
Recalls/TSBs owners mention: Recall 25V148000 performed; subsequent hard shifting and check engine light not addressed.
Synthesized from 12 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 12 most recent
The contact owns a 2019 Cadillac CT6. The contact stated that while driving approximately 75 MPH, the wheels locked up and the vehicle started swaying from side to side, and the vehicle decelerated. The contact was able to coast to the side of the road and had the vehicle towed to an independent mechanic. The vehicle was diagnosed with rear differential failure, and DTC: P0747 (Transmission…
The contact owns a 2019 Cadillac CT6. The contact received notification of NHTSA Campaign Number: 25V148000 (Power Train); however, the part to do the recall repair was not yet available. The contact stated while driving at various speeds, the vehicle shuddered, and the transmission was shifting hard. There was no warning light illuminated. The vehicle was taken to the dealer, where it was…
The contact owns a 2019 Cadillac CT6. The contact received notification of NHTSA Campaign Number: 25V148000 (Power Train); however, the part to do the recall repair was not yet available. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The dealer was made aware of the issue and confirmed that parts were not yet available. The manufacturer…
The contact owns a 2019 Cadillac CT6. The contact received notification of NHTSA Campaign Number: 25V148000 (Power Train); however, the part to do the recall repair was unavailable. The local dealer was contacted, and it was confirmed that the part was not yet available. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was…
The contact owns a 2019 Cadillac CT6. The contact received notification of NHTSA Campaign Numbers: 25V148000 (POWER TRAIN); however, the part to do the recall repair was not yet available. The contact stated that upon parking and exiting the vehicle, the vehicle rolled backwards approximately 1 to 2 feet. The driver's door was ajar with the driver’s foot near the vehicle, and the contact was able…
The contact owns a 2019 Cadillac CT6. The contact received notification of NHTSA Campaign Number: 25V148000 (Power Train); however, the part to do the recall repair was not yet available. The local dealer was contacted and confirmed that parts were not yet available. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was made…
On several separate occasions, my Cadillac CT 6 which has been under recall for months by General Motors does not have an adequate repair for the repair shops authorized by the manufacturer, namely GM franchised Cadillac dealer repair shops and hence I am unable to have my vehicle repaired because the franchised GM dealers inform me that due to the recall and General Motor’s refusal or inability…
The contact owns a 2019 Cadillac CT6. The contact stated while driving approximately 50 MPH, the vehicle was lagging. There were no warning lights illuminated. The contact received notification of NHTSA Campaign Number: 25V148000 (Power Train); however, the part to do the recall repair was not yet available. The local dealer was contacted. The contact stated that the manufacturer had exceeded a…
The contact owns a 2019 Cadillac CT6. The contact received notification of NHTSA Campaign Number: 25V148000 (Power Train); however, the part to do the recall repair was unavailable. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the issue. The contact had not experienced a failure. VIN tool confirms parts…
The contact owns a 2019 Cadillac CT6. The contact stated upon parking and exiting the vehicle, the vehicle started to roll back 1 to 2 feet. The contact stated that his foot was still near the vehicle, and the contact was able to depress the brake pedal, and the vehicle stopped. The contact pressed the Push to Start button and moved the column shifter back and forth until the vehicle…
Had powertrain trouble with your 2019 Cadillac CT6?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the powertrain problem on the 2019 Cadillac CT6?
It's a documented issue but not catastrophic. 12 complaints have been filed. Repairs average $2,500 and most owners catch it before it causes a breakdown.
At what mileage does the powertrain typically fail?
Based on the 12 complaints filed, powertrain issues most often appear around 70,667 miles. Some report problems earlier; some make it well past 150,000 with no symptoms. Maintenance habits matter — vehicles that received timely fluid services and were not regularly overworked tend to last longer.
What does it cost to fix?
Independent shops typically charge around $2,500 for powertrain repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to powertrain?
No active recalls currently cover powertrain issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2019/Cadillac/CT6.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.