Used 2018 GMC C6 Price in the US
A used 2018 GMC C6 in the US typically lists for $21,240–$24,274, with a median asking price of $22,725 across 40 active US dealer listings (as of 2026-09-01). The cheapest one listed right now is $13,500, a 2018 Medium Conventional 97 in Cleveland, OH — below 95% of the market, so expect an older model year, a base trim or high mileage.
- Typical range
- $21,240 – $24,274
- Median
- $22,725
- Cheapest 5%
- under $15,972
- Cheapest listed now
- $13,500
Browse by model year
cheapest per yearCheapest 10 listed right now
ranked by price-
$13,5002018 GMC C6 Medium Conventional 97192,559 mi · Cleveland, OH · National Car MartView listing →
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$15,5002018 GMC C6 Medium Conventional 97155,241 mi · Traverse City, MI · Jack's Auto SalesView listing → -
$16,6812018 GMC C6 Medium Conventional 97140,443 mi · Lansing, MI · LaFontaine Ford of LansingView listing → -
$17,9952018 GMC C6 Medium Conventional 97142,309 mi · Springfield, OH · Drive Safe AutoView listing → -
$18,2452018 GMC C6 Medium Conventional 9773,639 mi · New Baltimore, MI · Car CountryView listing →
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$19,9952018 GMC C6 Medium Conventional 97141,561 mi · Benton, AR · Cash Cars of ArkansasView listing → -
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$20,6452018 GMC C6 Medium Conventional 97117,645 mi · Lake City, MI · Classic ChevroletView listing →
These are the bottom of the market, not the going rate — every one is priced below 95% of active listings. A typical used 2018 GMC C6 asks $21,240–$24,274. Cars this far under usually carry an older model year, a base trim or high mileage.
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10 pinnedFAQ
How much does a used 2018 GMC C6 cost?
A used 2018 GMC C6 in the US typically lists for $21,240 to $24,274, with a median asking price of $22,725 across 40 active US dealer listings. Nine in ten are priced between $15,972 and $26,337 (as of 2026-09-01, source: UnderMarket Cars).
Is $23,000 a good price for a used 2018 GMC C6?
That sits at about the market median ($22,725) for a used 2018 GMC C6. Under $21,240 puts you in the cheapest quarter of active US listings and under $15,972 in the cheapest 5%; above $26,337 is the priciest 5% (as of 2026-09-01).
What is the cheapest used 2018 GMC C6 for sale right now?
$13,500 — a 2018 GMC C6 Medium Conventional 97 in Cleveland, OH, $9,225 under the median (as of 2026-09-01).
Are these MSRP or real asking prices?
Real asking prices from active US dealer listings, deduplicated by VIN — not manufacturer MSRP. They already reflect dealer discounts, and they exclude tax, title, registration and dealer fees.
How often are prices updated?
UnderMarket Cars refreshes US dealer listings continuously and re-generates this used 2018 GMC C6 price page at least twice a day. The data date shown on this page is 2026-09-01.
Explore more
Prices updated 2026-09-01. Data covers active dealer listings across the USA.