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FinalBid / Copart + IAAI

2018 GMC Sierra 2500HD auction results: final bids and sale history

FinalBid holds 1,752 completed Copart and IAAI auctions for 2018 GMC Sierra 2500HD. Across 1,727 recorded USD final bids, the median sold price is $12,600. Most of those cars were sold with front end. Half of the 835 verified odometer readings sit above 107,122 mi. The oldest auction in the archive closed in May 8, 2019, the newest in Nov 9, 2026. Auction results for the 2018 GMC Sierra 2500HD at Copart and IAAI. Each sold lot below shows the final bid together with the damage, odometer and title that explain it, so you can see where a particular 2018 GMC Sierra 2500HD belongs in the sold-price range rather than guessing at an average.

$9,650
Median final bid
$5,613–$14,794
Middle half
$20,630
Top 10% from
$37,750
Highest

Price index

Median final bid by month (line) and number of sales (bars), last 12 months.

$7,000 $8,770 $10,530 $12,300 Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov $9,200

Final bid by damage type

Median final bid by primary damage, all model years, last 12 months.

Damage Sold Median final bid
Rear end 25
$11,300
Side 46
$10,050
Front end 170
$9,250

Where they go

Buyer country of the winning bid, with the median price and model year each market buys. Shares of 248 sales with a known buyer country.

Buyer country Share Median final bid Median model year
United States
92%
$9,600 2018
Mexico
8%
$7,900 2018
Guatemala
0.8%
$5,450 2018

Country totals only. Individual lots do not show the buyer's country.

Copart vs IAAI

Copart 207 sold median $8,900
IAAI 111 sold median $11,150

Last 12 months · updated November 10, 2026

Sierra 2500HD years

2026 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001

GMC models

Acadia C1500 Caballero Canyon Denali Envoy Hummer EV Jimmy Rally Safari Safari Cargo Savana Savana Cargo Savana Commercial Sierra 1500 Sierra 1500HD Sierra 1500HD Classic Sierra 2500 Sierra 2500HD Sierra 3500 Sierra 3500HD Sierra Denali Sierra Denali Classic Sierra EV Sonoma Suburban Terrain Typhoon Van Vandura Yukon Yukon Denali Yukon XL

Auction archive FAQ

How much does a 2018 GMC Sierra 2500HD sell for at Copart and IAAI?

Over the last 12 months the median final bid for a 2018 GMC Sierra 2500HD was $9,650; half of the 318 sales went for $5,613 to $14,794.

Where do 2018 GMC Sierra 2500HD cars from US auctions go?

Among sales with a known buyer country: United States (92%), Mexico (8%), Guatemala (1%).

Is a 2018 GMC Sierra 2500HD cheaper at Copart or IAAI?

Median final bid over the last 12 months: Copart $8,900, IAAI $11,150.

How much does a 2018 GMC Sierra 2500HD sell for at auction?

The auction results listed here are the answer — every 2018 GMC Sierra 2500HD lot carries its own final bid. Read the range and place your car inside it instead of trusting one figure.

What pushes a 2018 GMC Sierra 2500HD final bid to the bottom of the range?

Water and fire losses, missing keys, deployed airbags and a branded title. Any two of those together usually explain a sold price that looks improbably low.

VIN history beyond the auction

Look past the final bid on any 2018 GMC Sierra 2500HD

Title brands, accident reports and odometer entries: the VIN history behind any auction lot.

Example VIN history →