2021 Peterbilt 389 X15 — Used Market Prices & Trends

The 2021 Peterbilt 389 powered by the X15 is currently represented by 13 active listings on TruckRadar. Listed units show a median odometer reading of about 371,000 miles. Most are configured as conventional cab with tandem rear axle (6x4) drivetrains, commonly paired with RTLO20918B and Eaton 18-Speed transmissions. Geographically, the largest concentrations of 2021 389 inventory sit in South Carolina, Texas, and Illinois. TruckRadar is not publishing a median asking price for this configuration because its priced listings are concentrated with a single dealer, so a median would reflect one seller's pricing rather than the broader market. To gauge pricing, review the individual active listings below — each shows the dealer's own asking price directly. Buyers comparing this configuration often also evaluate the 579 and 567. All figures reflect active dealer listings on TruckRadar and are asking prices, not sale prices.

2021 Peterbilt 389 X15 — Frequently Asked Questions