# Freightliner Coronado Common Problems & What to Check | Big Rig Risk

> Freightliner Coronado: documented problems include engine-transmission oil leak and preventive fluid flush. What to inspect before you buy used.

**Verdict:** inspect

Used pricing varies; see sources. Biggest documented cost risk: 2012 Coronado, "eng controller no response" dash warning. Buy only after inspection.

**Documented failure risks:**
- Engine controller fault: 2012 Coronado, "eng controller no response" dash warning: owner quotes a dealer-level
- Engine-transmission oil leak: Owner-reported oil leak at the engine/transmission junction area, resolved under warranty
- Turbo, exhaust manifold, and transmission output shaft seal: Turbo, exhaust manifold, and transmission output shaft seal were replaced on this truck, per the owner's documented service history.
- Preventive fluid flush: Preventive fluid flush of the engine, transmission, and rear ends was performed at 300,000 miles as preventive maintenance.
- 554Me8EI9BQ: The "5 Things I HATE" video (ID 554Me8EI9BQ) raises vague noise/vibration complaints on this truck.

## Sources
- [youtube.com](https://www.youtube.com/watch?v=zMdGxD5_wNk) (accessed 2026-08-19)
- [youtube.com](https://www.youtube.com/watch?v=nZ1dkIqpLg4) (accessed 2026-08-19)
- [4btengines.com](https://4btengines.com/top-isx15-problems/) (accessed 2026-08-19)
- [dieselpro.com](https://dieselpro.com/blog/cummins-isx-history-specs-common-issues/) (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)
- [5 Things I HATE About my 2016 Freightliner Coronado Glider !! Problems as well.](https://www.youtube.com/watch?v=554Me8EI9BQ) (accessed 2026-08-19)
- [REBUILD COMPLETE! 2016 Freightliner Coronado GLIDER KIT Semi Truck Review ](https://www.youtube.com/watch?v=npU4rtURzBU) (accessed 2026-08-19)

_Last verified 2026-08-19. Source: Big Rig Risk — https://bigrigrisk.com/trucks/freightliner-coronado-cummins-isx15/ — every claim checked against a primary source before publication (see /methodology/)._