Is the 2018 Cadillac CT6 reliable?

The 2018 Cadillac CT6 has 13 complaints filed with NHTSA (0.8x the segment average). Our reliability verdict: excellent. Most common issue: ENGINE problems.

What are common problems with the 2018 Cadillac CT6?

Top problems: ENGINE (2 complaints, avg repair $500); TRANSMISSION (2 complaints, avg repair $500); STEERING (2 complaints, avg repair $500). Issues typically appear around 50K miles.

Are there any recalls on the 2018 Cadillac CT6?

Yes, there are 2 recall(s): SEAT BELTS:REAR/OTHER, SEATS:MID/REAR ASSEMBLY. Contact any Cadillac dealer to verify if recalls have been completed on your specific vehicle.

How much does it cost to fuel a 2018 Cadillac CT6?

The 2018 Cadillac CT6 gets 25 MPG combined. At current US average gas prices, driving 12,000 miles per year costs roughly $1920. See the interactive fuel cost calculator on this page for state-specific pricing.

How much does it cost to insure a 2018 Cadillac CT6?

Estimated US average full-coverage insurance for the 2018 Cadillac CT6 is approximately $2,143/year (sedan-luxury class). Actual quotes vary heavily by state, driver age, driving record, and credit — see the interactive insurance estimator on this page for state-specific pricing.

2018 Cadillac CT6

Problems, Recalls & Reliability Report

Excellent Reliability

Quick Summary

The 2018 Cadillac CT6 has 13 owner complaints filed with NHTSA — that's 0.8x the segment average of 16. The most common issue is engine problems (15% of all complaints), specifically: my cadillac ct6 (2018) quit working while on the expressway. i was in the middle of no where, in georgia. this made for a very dangerous situation as the car suddenly lost all power going to the wheels while driving at approx. 75 mph. i was barely able to get around traffic to be able to pull over a. There are 2 recalls issued for this model year.

Total Complaints

Recalls Issued

—/5

Safety Stars

0.8x

vs Segment Avg

Known Problems(top 5 of 8)

ENGINE

2 complaints

15%

• MY CADILLAC CT6 (2018) QUIT WORKING WHILE ON THE EXPRESSWAY. I WAS IN THE MIDDLE OF NO WHERE, IN GEORGIA. THIS MADE FOR A VERY DANGEROUS SITUATION AS THE CAR SUDDENLY LOST ALL POWER GOING TO THE WHEELS WHILE DRIVING AT APPROX. 75 MPH. I WAS BARELY ABLE TO GET AROUND TRAFFIC TO BE ABLE TO PULL OVER A
• The brake makes a rattling and metal grinding sound, the dealership said nothing is wrong with the brakes, still problematic. The transmission shifts too hard. Dealer said nothing wrong. Yet cat kicks too hard.

Typical onset: 50K miles Est. repair: $500

“MY CADILLAC CT6 (2018) QUIT WORKING WHILE ON THE EXPRESSWAY. I WAS IN THE MIDDLE OF NO WHERE, IN GEORGIA. THIS MADE FOR A VERY DANGEROUS SITUATION AS THE CAR SUDDENLY LOST ALL POWER GOING TO THE WHEELS WHILE DRIVING AT APPROX. 75 MPH. I WAS BARELY ABLE TO GET AROUND TRAFFIC TO BE ABLE TO PULL OVER A”

— NHTSA complaint filing

Recalls (2)

SEAT BELTS:REAR/OTHER26/09/2018

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."

Risk: If the child seat is not properly secured in the event of a crash, it can increase the risk of injury.

Fix: GM will notify owners, and dealers will inspect the rear seatbelt retractors and replace them if necessary, free of charge. The recall began November 7, 2018. Owners may contact Cadillac customer service at 1-800-458-8006, Chevrolet customer service at 1-800-222-1020 or GMC customer service at 1-800-462-8782. GM's number for this recall is 18315.

Fuel Cost Calculator for 2018 Cadillac CT6

Live EIA prices

Annual miles driven: 12,000

Your state (affects local gasoline price)

Per year

$1,920

Per month

$160

Per mile

16.0¢

MPG

City driving (worst-case MPG)

$2,182/yr

Highway driving (best-case MPG)

$1,600/yr

Based on EPA fuel-economy ratings and EIA weekly retail prices (2026-07-20). Real-world cost varies with driving style, trim/engine, terrain, and traffic.

5-Year Gas Price History

EIA weekly retail data · 2021 → today

Show:

Current

$4.00

5-year low

$2.78

5-year high

$5.01

Since 2021

+27%

Source: US Energy Information Administration weekly retail gasoline prices.

Estimated Insurance Cost for 2018 Cadillac CT6

Estimate only, not a quote. Modeled from NAIC + HLDI averages for a hypothetical 35-year-old driver with clean record + full coverage. Your actual quote depends heavily on your age, driving history, credit, ZIP code, and insurer.

Your state (affects local premium average)

Full coverage / year

$2,143

Full coverage / month

$179

Liability only / year

$710

vs US avg

+28%

How this estimate is calculated

US base full-coverage premium$1674

× state (US)1.00x

× vehicle class (sedan-luxury)1.28x

× theft risk1.00x

× safety rating1.00x

× vehicle age1.00x

= Full coverage estimate$2143

Coverage assumed: 100/300/100 liability + comprehensive/collision, $500 deductibles. Data sources: NAIC 2024 + HLDI loss studies.

Maintenance & Warranty

Cadillac New-Vehicle Warranty Coverage

Bumper-to-bumper (basic)

4 yr / 50K mi

Powertrain

6 yr / 70K mi

Hybrid/EV battery

8 yr / 100K mi

Corrosion (rust perforation)

6 yr / 100K mi

Roadside assistance

6 yr / 70K mi

These are the terms for a new Cadillac. If you're buying a used 2018 CT6, remaining coverage is usually pro-rated from the vehicle's original in-service date. Not all coverage transfers between owners — check with a Cadillac dealer for VIN-specific remaining warranty.

Estimated Repair Costs

ENGINE(~50K mi)

$500

TRANSMISSION(~50K mi)

$500

STEERING(~50K mi)

$500

FUEL SYSTEM(~50K mi)

$500

SPEED CONTROL(~50K mi)

$500

Estimates based on average reported repair costs. Actual costs vary by location, shop, and severity.

🔍 Pre-Purchase Inspection Checklist

Based on 13 owner complaints for this specific year, here's what to check or ask about:

☐
ENGINE: MY CADILLAC CT6 (2018) QUIT WORKING WHILE ON THE EXPRESSWAY. I WAS IN THE MIDDLE OF NO WHERE, IN GEORGIA. THIS MADE FOR A VERY DANGEROUS SITUATION AS THE CAR SUDDENLY LOST ALL POWER GOING TO THE WHEELS WHILE DRIVING AT APPROX. 75 MPH. I WAS BARELY ABLE TO GET AROUND TRAFFIC TO BE ABLE TO PULL OVER A
Typically appears around 50K miles. Repair cost ~$500
☐
TRANSMISSION: MY CADILLAC CT6 (2018) QUIT WORKING WHILE ON THE EXPRESSWAY. I WAS IN THE MIDDLE OF NO WHERE, IN GEORGIA. THIS MADE FOR A VERY DANGEROUS SITUATION AS THE CAR SUDDENLY LOST ALL POWER GOING TO THE WHEELS WHILE DRIVING AT APPROX. 75 MPH. I WAS BARELY ABLE TO GET AROUND TRAFFIC TO BE ABLE TO PULL OVER A
Typically appears around 50K miles. Repair cost ~$500
☐
STEERING: ON MAR 1, 2021 WHILE DRIVING SUPER CRUISE MODE, MY CAR JERKED VIOLENTLY TO THE LEFT ALMOST STRIKING ANOTHER CAR. I WAS ON THE FL TURNPIKE ABOUT 20 MILES NORTH OF ORLANDO HEADING SOUTH. THE HIGHWAY WAS INCREASING FROM 2 LANE TO 3 LANE SOUTHBOUND AND I WAS IN THE RIGHT LANE. WHEN I ENTERED THE LANE TR
Typically appears around 50K miles. Repair cost ~$500
☐
FUEL SYSTEM: MY CADILLAC CT6 (2018) QUIT WORKING WHILE ON THE EXPRESSWAY. I WAS IN THE MIDDLE OF NO WHERE, IN GEORGIA. THIS MADE FOR A VERY DANGEROUS SITUATION AS THE CAR SUDDENLY LOST ALL POWER GOING TO THE WHEELS WHILE DRIVING AT APPROX. 75 MPH. I WAS BARELY ABLE TO GET AROUND TRAFFIC TO BE ABLE TO PULL OVER A
Typically appears around 50K miles. Repair cost ~$500
☐
RECALLS: Verify all 2 recalls have been completed — free at any Cadillac dealer
☐
General: Get a pre-purchase inspection from an independent mechanic ($100-$200)