# Kenworth T680 Used Price & Common Problems | Big Rig Risk

> Kenworth T680: one used listing at $12,000. Documented problems: fuel pump and spun main bearings. What to inspect before you buy.

**Verdict:** inspect

One observed listing at $12,000, a thin comp set. Biggest documented cost risk: the fuel pump, the most common complaint. Buy only after inspection.

**Observed used price:** $12,000–$12,000

**Documented failure risks:**
- Fuel pump: Fuel pump is the headline complaint: "the most common problem is the fuel pump... from 17
- EGR valve sticking open: EGR valve sticking open from carbon buildup at low idle causes derate/check-engine; on-
- Spun main bearings: A second mechanic source (Francisco Amaya) documents spun main bearings from deferred
- VGT turbo fouling: Engine-family sources (shared Cummins 15L platform, X15 = post-2017 ISX15): VGT turbo

## Sources
- [youtube.com](https://www.youtube.com/watch?v=oh6-x3lp-iM) (accessed 2026-08-19)
- [youtube.com](https://www.youtube.com/watch?v=vp3cl3E7Etw) (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)
- [youtube.com](https://www.youtube.com/watch?v=CrDuDh0DsbM) (accessed 2026-08-19)
- [dieselrebuildkits.com](https://dieselrebuildkits.com/) (accessed 2026-08-19)
- [truckpaper.com](https://www.truckpaper.com/listings/for-sale/kenworth/t680/conventional-day-cab-trucks) (accessed 2026-08-19)
- [NHTSA recall 25V181000 (ELECTRICAL SYSTEM:PROPULSION SYSTEM)](https://www.nhtsa.gov/recalls?nhtsacampaignnumber=25V181000) — "PACCAR Incorporated (PACCAR) is recalling certain 2022-2025 Peterbilt 520, 579, and 2021-2025 Kenworth T680 trucks.  The high voltage (HV) contactors may open, causing a sudden loss of high voltage and a loss of drive power." (accessed 2026-09-11)
- [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)

_Last verified 2026-09-11. Source: Big Rig Risk — https://bigrigrisk.com/trucks/kenworth-t680-cummins-x15/ — every claim checked against a primary source before publication (see /methodology/)._