# Peterbilt 389 Used Price & Common Problems | Big Rig Risk

> Peterbilt 389: used $79,950 to $149,950. Documented problems: injectors and relief valve. What to inspect before you buy.

**Verdict:** inspect

Used Peterbilt 389: $79,950–$149,950 observed used across 15 listings. The documented cost risk to price in: roadside coolant leaks and injectors at about $1,000 each. Buy only after inspection.

**Observed used price:** $79,950–$149,950

**Documented failure risks:**
- Roadside coolant leak: Roadside coolant leak ("coolant was leaking everywhere") followed within the same trip
- Injectors and relief valve: Injectors ~$1,000 each; a relief valve was flagged as a likely leak point during ISX/X15

## Sources
- [youtube.com](https://www.youtube.com/watch?v=JFo8-VoM_kU) (accessed 2026-08-19)
- [youtube.com](https://www.youtube.com/watch?v=CrDuDh0DsbM) (accessed 2026-08-19)
- [youtube.com](https://www.youtube.com/watch?v=YkuAPHTfYQw) (accessed 2026-08-19)
- [youtube.com](https://www.youtube.com/watch?v=e3HpmZ-z51Q) (accessed 2026-08-19)
- [dieselpro.com](https://dieselpro.com/blog/cummins-isx-history-specs-common-issues/) (accessed 2026-08-19)
- [4btengines.com](https://4btengines.com/top-isx15-problems/) (accessed 2026-08-19)
- [cylinder-heads.com](https://www.cylinder-heads.com/cummins-isx/) (accessed 2026-08-19)
- [dieselrebuildkits.com](https://dieselrebuildkits.com/) (accessed 2026-08-19)
- [soarr.com dealer inventory listings (15 real listings observed 2026-09-05)](https://www.soarr.com/for-sale/trucks/105/Peterbilt/389/sleeper-trucks-for-sale-in-missouri) (accessed 2026-09-05)
- [NHTSA recall 21V080000 (ENGINE)](https://www.nhtsa.gov/recalls?nhtsacampaignnumber=21V080000) — "PACCAR Incorporated (PACCAR) is recalling certain 2021-2022 Kenworth T680, T880, W990, T800, W900 and Peterbilt 579, 567, 389, 367 vehicles equipped with a Cummins X15 engine.  The capscrews that attach the flywheel to the crankshaft may have been improperly torqued, allowing the flywheel to detach." (accessed 2026-09-11)
- [NHTSA recall 15V108000 (STEERING:LINKAGES:TIE ROD ASSEMBLY)](https://www.nhtsa.gov/recalls?nhtsacampaignnumber=15V108000) — "PACCAR Incorporated (PACCAR) is recalling certain model year 2009-2015 Peterbilt 320, 365, 367, 388, and 389 trucks manufactured July 21, 2008, to February 28, 2014.  The front axle tie rod end clamp bolts may be improperly torqued." (accessed 2026-09-11)

_Last verified 2026-09-11. Source: Big Rig Risk — https://bigrigrisk.com/trucks/peterbilt-389-cummins-x15/ — every claim checked against a primary source before publication (see /methodology/)._