2018 GMC C6 prices in the U.S.
The median pre-owned asking price for a 2018 GMC C6 in the U.S. is $22,637 based on 39 active listings.
As of September 9, 2026, the median asking price for a used 2018 GMC C6 in the U.S. is $22,637, based on 39 active dealer listings tracked by VinAssessment.
◷ Updated September 9, 2026 ▤ 39 active dealer listings, refreshed daily
Typical: $20,750–$24,180 — the middle half of 39 asking prices
Why the wide range? Price depends mostly on configuration and mileage — see below. This spread covers the middle 96% of asking prices: we exclude the cheapest and priciest 2% (payment-priced ads, typos, salvage) so outliers don't distort it.
What moves the price on a 2018 GMC C6
The $20,750–$24,180 typical range isn't randomness — one factor explains most of it:
Asking prices run about $25,445 at 60K–75K miles and fall to $19,995 over 105K miles — roughly $1,200 for every 10,000 miles.
Find your mileage and trim in the configurator below.
Configure the exact car
Modelled from 39 real asking prices, adjusted for mileage and location. Not a formal appraisal.
What would a 2018 GMC C6 cost per month?
Estimate the monthly payment on a $22,637 vehicle. Move the numbers to match your own loan.
Estimate only. Excludes tax, title, registration and dealer fees, and assumes a fixed-rate loan with equal monthly payments. Your actual rate depends on your credit and lender.
2018 GMC C6: a fair price for your mileage
A 2018 GMC C6 sheds roughly $1,200 for every 10,000 miles. Find your mileage below.
| Mileage ⓘ | Based on ⓘ | Fair price ⓘ | Typical range ⓘ |
|---|---|---|---|
| 60K–75K miles | 5 listings | $25,445 | $24K–$26K |
| 75K–90K miles | 10 listings | $23,942 | $23K–$25K |
| 90K–105K miles | 10 listings | $22,712 | $22K–$23K |
| Over 105K miles | 12 listings | $19,995 | $17K–$21K |
Same trim and condition assumed — mileage is the biggest lever after configuration.
Live 2018 GMC C6 listings, priced by VIN
Every VIN links to a full market report: decode, active listings and the local price band. Shop 2017–2019 GMC C6 listings on VehiSales →.
Price trend
Average price is down $992 since June 11.
2018 GMC C6 prices by state
| State | Typical price | Listed this year | Active now |
|---|---|---|---|
| Ohio | $19,728 | 5 | 5 Shop 2017–2019 nearby → |
Listed this year counts every 2018 GMC C6 first listed in 2026 (sold and active), with currently active cars as a floor. Typical price is the median of each car's latest asking price — or the average of active listings where this-year data is thin.
Factory configurations of the 2018 GMC C6
2 factory configurations left the plant as a 2018 GMC C6 — the most common are below, each decoded into its own build sheet from the VIN pattern.
Keep exploring C6 prices
2018 GMC C6 · $22,637 typical · 39 listingsMore 2018 GMC prices
Own a 2018 GMC C6? See what it's worth →
Frequently asked questions
Why do 2018 GMC C6 prices range from $15,020 to $26,826?
The spread comes down to configuration and mileage: higher-mileage, base-configuration examples sit near the low end, while low-mileage and premium configurations reach the top. Half of all listings fall between $20,750 and $24,180 — see the mileage and trim breakdowns above for where a specific vehicle lands.
How much should mileage change the price of a 2018 GMC C6?
Expect roughly $1,200 less for every 10,000 miles on the odometer. A 60K-mile example should cost about $3,600 less than a 30K-mile one of the same trim — check the fair-price-by-mileage table above for your band.
How many 2018 GMC C6 are for sale right now?
39 in total, nearly all pre-owned. Counts refresh daily from live dealer inventory.
How we calculate these prices
We track 39 active listings for this vehicle across dealer sites nationwide, updated every day. Average and median are computed from real asking prices on live listings. We exclude the top and bottom 2% of prices to reduce the influence of extreme values. This does not verify title status or guarantee that every erroneous listing is excluded. Prices reflect dealer asking prices — not final sale prices — and exclude taxes, fees, and incentives. Trim and mileage move the price more than any other factor; see the breakdowns above.
Want the original factory equipment and MSRP behind a specific car? Pull the original window sticker by VIN →
Shopping for this car?
Check individual VINs before you buy — decode the exact trim and mileage, see every active listing, and how each price compares to the local market.