Is the 2021 Cadillac CT4 reliable?

The 2021 Cadillac CT4 has 9 complaints filed with NHTSA (1.0x the segment average). Our reliability verdict: above-average. Most common issue: ENGINE problems.

What are common problems with the 2021 Cadillac CT4?

Top problems: ENGINE (2 complaints, avg repair $500); TIRES (1 complaints, avg repair $500); STEERING (1 complaints, avg repair $500). Issues typically appear around 50K miles.

Are there any recalls on the 2021 Cadillac CT4?

Yes, there are 4 recall(s): AIR BAGS:SIDE/WINDOW:CURTAIN, AIR BAGS:SRS MALFUNCTION WARNING LAMP/LIGHT, EXTERIOR LIGHTING:LIGHTING CONTROL MODULE:SOFTWARE, POWER TRAIN:AUTOMATIC TRANSMISSION. Contact any Cadillac dealer to verify if recalls have been completed on your specific vehicle.

How much does it cost to fuel a 2021 Cadillac CT4?

The 2021 Cadillac CT4 gets 26 MPG combined. At current US average gas prices, driving 12,000 miles per year costs roughly $1846. See the interactive fuel cost calculator on this page for state-specific pricing.

How much does it cost to insure a 2021 Cadillac CT4?

Estimated US average full-coverage insurance for the 2021 Cadillac CT4 is approximately $2,250/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.

2021 Cadillac CT4

Problems, Recalls & Reliability Report

Above Average

Quick Summary

The 2021 Cadillac CT4 has 9 owner complaints filed with NHTSA — that's 1.0x the segment average of 9. The most common issue is engine problems (22% of all complaints), specifically: engine and transmission for the second time in 90 days apart. supposedly be a new part. i don’t think so.. There are 4 recalls issued for this model year.

Total Complaints

Recalls Issued

—/5

Safety Stars

1.0x

vs Segment Avg

Known Problems(top 5 of 8)

ENGINE

2 complaints

22%

• Engine and transmission for the second time in 90 days apart. Supposedly be a new part. I don’t think so.
• valve body failed and was supposedly repaired. I had the car 1 day and valve body failed again. My car has been in the shop since November 4, 2024 with no estimated time of repair because no parts are available. I was told they would replace the transmission. That has not happened yet. No parts

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

“Engine and transmission for the second time in 90 days apart. Supposedly be a new part. I don’t think so.”

— NHTSA complaint filing

Recalls (4)

AIR BAGS:SIDE/WINDOW:CURTAIN05/08/2021

General Motors, LLC. (GM) is recalling certain 2020-2022 Cadillac CT4 and CT5 vehicles. The roof rail side-curtain air bags may not have been installed correctly, which could result in an improper air bag deployment during a crash.

Risk: Air bags that do not deploy properly can increase the risk of injury in a crash.

Fix: Dealers will inspect both left and right-side roof rail air bags and reinstall the air bags, as necessary, free of charge. Owner notification letters were mailed on August 30, 2021. Owners may contact Cadillac customer service at 1-800-458-8006. GM's number for this recall is N212342780.

Fuel Cost Calculator for 2021 Cadillac CT4

Live EIA prices

Annual miles driven: 12,000

Your state (affects local gasoline price)

Per year

$1,847

Per month

$154

Per mile

15.4¢

MPG

City driving (worst-case MPG)

$2,286/yr

Highway driving (best-case MPG)

$1,412/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 2021 Cadillac CT4

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

$2,250

Full coverage / month

$188

Liability only / year

$710

vs US avg

+34%

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 age1.05x

= Full coverage estimate$2250

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 2021 CT4, 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

TIRES(~50K mi)

$500

STEERING(~50K mi)

$500

ELECTRICAL(~50K mi)

$500

DRIVER ASSIST/CAMERAS(~50K mi)

$500

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

🔍 Pre-Purchase Inspection Checklist

Based on 9 owner complaints for this specific year, here's what to check or ask about:

☐
ENGINE: Engine and transmission for the second time in 90 days apart. Supposedly be a new part. I don’t think so.
Typically appears around 50K miles. Repair cost ~$500
☐
TIRES: 235 40 80 run flat Both front and rear passenger tires no damage to rim less that 10k miles
Typically appears around 50K miles. Repair cost ~$500
☐
STEERING: While driving the power steering was lost. The the auto hold function lit up. The collision warning light lit up. The stabilitrak system lit up. The air bag safety system lit up. Steering became very hard and made for y safe driving. Later that day 01-22-24, all warning light went out and power st
Typically appears around 50K miles. Repair cost ~$500
☐
ELECTRICAL: While driving the power steering was lost. The the auto hold function lit up. The collision warning light lit up. The stabilitrak system lit up. The air bag safety system lit up. Steering became very hard and made for y safe driving. Later that day 01-22-24, all warning light went out and power st
Typically appears around 50K miles. Repair cost ~$500
☐
RECALLS: Verify all 4 recalls have been completed — free at any Cadillac dealer
☐
General: Get a pre-purchase inspection from an independent mechanic ($100-$200)