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ProblemsByVinFile / 2018-CADILLAC-CT6NHTSA data synced 1 day ago
Cadillac
2018 Cadillac CT6 problems
Light NHTSA footprint — 10 owner complaints and 2 active recall campaigns. Either a clean record or thin data; we'll show what's there.
The 2018 Cadillac CT6 has 10 NHTSA owner complaints and 2 recalls on file (U.S. federal records, as of August 2026). The most-reported system is powertrain at 3 complaints, typically surfacing around 26,250 miles (~$2,500 to repair). Source: NHTSA Office of Defects Investigation.
Solid reliability overall. Common issues are concentrated in a few systems.
0
Critical
2
Severe
0
Moderate
Should you avoid this 2018 CT6?
Generally reliable
Buyable on the data — keep up the usual maintenance and inspect normally.
No systemic severe-failure pattern in the complaint record
Reliability score 8.4/10 — above the segment average
2 recall campaigns on file
Our read of the federal NHTSA complaint and recall record for this exact year and model —
not a substitute for a pre-purchase inspection. How we score.
Buying a used 2018 Cadillac CT6? Check these first
Here's what this model is known to do — so you can inspect for it, price it in, or
make the seller fix it before you sign.
What to inspect on this specific car
powertrain — 3 owner reports
· tends to show around 26,250 mi · ~$2,500 to fix
steering — 3 owner reports
· tends to show around 31,250 mi · ~$700 to fix
Recalls to confirm are done
Run the VIN from the listing — 2 active recalls on this model. Recall repairs are always free.
Verdict for buyers: 8.4/10 model. The priciest documented failure is
powertrain (~$2,500) — get the
seller's service records for it or inspect closely. Otherwise an average-risk used buy at a fair price.
We tell you what this model is known for and what to inspect — a vehicle-history report
tells you what this exact car has been through. Smart buyers get both.
A noise, a warning light, a repair quote, "should I buy this?" — get an answer grounded in
this vehicle's actual NHTSA record, not generic advice.
Dash light, leak, worn part — snap it and we'll read it against this car's record.
Photo attached — type a question or just hit Ask.
Answers use this vehicle's NHTSA complaint & recall record — owner-reported and unverified, not a diagnosis. Verify anything safety-critical with a mechanic.
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What owners are saying
recent NHTSA-filed complaints · verbatim
2018 CT6· powertrain
Front differential case ripped in half and separated from the ring gear. The broken chunk of differential case and pinion was still attached to the driveshaft while coming to an abrupt stop. Damage done within driveshaft tunnel. No warning, no vibration, no cause for concern,…
My engine light is on and this is the 15th time I have bought my car in for various engine problems like engine power reduced and other problems with this car. The car would just stop in the middle of the ride or jerking as I drive it. I have been on the highway when it has…
Loss of all vehicle power while traveling on the freeway at highway speeds. Vehicle check engine, power limited, and electric motor overheat warning lights come on. The combustion engine will not start, and battery power availability goes to zero. This is very dangerous to…
Stuck Thermostat. Vehicle not achieving operating temperature in the correct time. ALL 3 of the people I know with CT-6's had the exact same issue this year.
Had a problem with your 2018 Cadillac CT6?
File a complaint with NHTSA → It's free and official — owner filings are what build the federal safety record behind this page.
Estimate your repair exposure
Drag to your current mileage. Numbers are derived from this vehicle's complaint history.
General Motors LLC (GM) is recalling certain 2018-2019 Cadillac CT6, Escalade ESV, Chevrolet Suburban, Volt, and GMC Yukon XL vehicles
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.
General Motors LLC (GM) is recalling certain 2016-2018 Cadillac CT6 vehicles
If the child seat cannot be attached correctly to the anchorage bar, there is an increased the risk of injury.
Fix: GM will notify owners, and dealers will inspect, remove any excess adhesive, and apply anti-corrosion primer to the inboard child seat anchorage bars, free of charge. The recall began August 3, 2018. Owners may contact Cadillac customer service at 1-800-458-8006. GM's number for this recall is 18228.
Common questions
Is the 2018 Cadillac CT6 reliable?
Mostly yes. With a reliability score of 8.4 out of 10 based on 10 owner complaints filed with NHTSA, the 2018 Cadillac CT6 is generally a sound vehicle. The areas to watch are listed in the top problem section above — most are budget items, not deal-breakers.
Should you avoid the 2018 Cadillac CT6?
On the NHTSA data, the 2018 Cadillac CT6 does not need avoiding. Buyable on the data — keep up the usual maintenance and inspect normally. The record behind that call: No systemic severe-failure pattern in the complaint record; Reliability score 8.4/10 — above the segment average; 2 recall campaigns on file. This is our read of the federal complaint and recall data — not a substitute for a pre-purchase inspection.
What should I check before buying a used 2018 Cadillac CT6?
Inspect the powertrain first — it's the most-reported issue on this model, with 3 owner complaints filed. Typical failure occurs around 26,250 miles. Average repair cost runs about $2,500 at an independent shop. Also confirm any open recalls have been completed by running the VIN, and ask for service records covering the problem areas listed above.
Is the 2018 Cadillac CT6 a good used car to buy?
It scores 8.4 out of 10 on our NHTSA-based read of 10 owner complaints. The main thing to watch is powertrain. Typical failure occurs around 26,250 miles. Priced fairly and clean on inspection, it's a reasonable used buy. Our data covers what this model is known for — pair it with a vehicle-history report on the VIN to see what that specific car has been through.
What's the most common problem on the 2018 Cadillac CT6?
Based on NHTSA records, the most-reported issue is powertrain, with 3 complaints filed. Typical failure occurs around 26,250 miles. Average repair cost runs about $2,500 at an independent shop.
What's the most expensive thing that goes wrong?
The powertrain is one of the costlier repair items. Average repair cost runs about $2,500 at an independent shop. Typical failure occurs around 26,250 miles. Catching early warning signs can sometimes extend life by 20–30,000 miles.
How do I check if my Cadillac CT6 has open recalls?
Paste your VIN into the decoder at the top of this page. We pull live from NHTSA, so you'll see exactly which campaigns apply to your vehicle and whether the dealer has logged the fix. Recall repairs are always free regardless of mileage or warranty status.
Is an extended warranty worth it on a 2018 Cadillac CT6?
Math is straightforward: a quality service contract runs $1,800–3,500 over 3 years. With 10 complaints on file and the costliest repair averaging $2,500, one major failure more than pays for it. The catch is reading the contract — many providers exclude wear items and require pre-authorization, so cheaper plans are not always better value.
Recall and complaint data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database, last synced 1 day ago. Verify the raw federal record at
nhtsa.gov/vehicle/2018/Cadillac/CT6.
Editorial commentary written by ProblemsByVin contributors and reviewed by ASE-certified mechanics.
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