Used 2018 GMC C5 Price in the US
A used 2018 GMC C5 in the US typically lists for $18,371–$22,991, with a median asking price of $19,995 across 7 active US dealer listings (as of 2026-08-28). The cheapest one listed right now is $15,686, a 2018 Medium Conventional 97 in Palm Harbor, FL — below 95% of the market, so expect an older model year, a base trim or high mileage.
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cheapest per yearCheapest 7 listed right now
ranked by price-
$15,6862018 GMC C5 Medium Conventional 97122,981 mi · Palm Harbor, FL · Tasca LincolnView listing →
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$17,7472018 GMC C5 Medium Conventional 97104,000 mi · Panama City, FL · Go 2 Auto'sView listing → -
$18,9952018 GMC C5 Medium Conventional 97141,521 mi · Huntsville, TX · Dale's Auto SalesView listing → -
$19,9952018 GMC C5 Medium Conventional 97102,951 mi · Yuma, AZ · Michelle's Auto - YumaView listing →
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$21,9002018 GMC C5 Medium Conventional 9734,850 mi · San Diego, CA · San Diego Auto HouseView listing →
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$25,1442018 GMC C5 Medium Conventional 9754,188 mi · Athens, GA · Heyward Allen Motor CompanyView 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 C5 asks $18,371–$22,991. Cars this far under usually carry an older model year, a base trim or high mileage.
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7 pinnedFAQ
How much does a used 2018 GMC C5 cost?
A used 2018 GMC C5 in the US typically lists for $18,371 to $22,991, with a median asking price of $19,995 across 7 active US dealer listings. Nine in ten are priced between $16,304 and $24,825 (as of 2026-08-28, source: UnderMarket Cars).
Is $20,000 a good price for a used 2018 GMC C5?
That sits at about the market median ($19,995) for a used 2018 GMC C5. Under $18,371 puts you in the cheapest quarter of active US listings and under $16,304 in the cheapest 5%; above $24,825 is the priciest 5% (as of 2026-08-28).
What is the cheapest used 2018 GMC C5 for sale right now?
$15,686 — a 2018 GMC C5 Medium Conventional 97 in Palm Harbor, FL, $4,309 under the median (as of 2026-08-28).
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 C5 price page at least twice a day. The data date shown on this page is 2026-08-28.
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Prices updated 2026-08-28. Data covers active dealer listings across the USA.