Hawaii Engine & Jake Brake Rules
Hawaii has no statewide engine-brake ban and essentially no 'no engine brake' sign culture. The legal hook is the muffler statute (HRS 291-24.5): you cannot run a muffler that noticeably raises noise above factory level, fine $25 to $250 per offense. Heavy trucking and long grades are limited, so posted zones are rare. Use your engine brake normally on grades like Saddle Road or the Maui descents where nothing is posted.
A detail here is flagged medium confidence — confirm with the state DMV or the local ordinance before you rely on it.
How Hawaii handles engine braking
Hawaii has no statewide engine-brake ban and essentially no 'no engine brake' sign culture. The legal hook is the muffler statute (HRS 291-24.5): you cannot run a muffler that noticeably raises noise above factory level, fine $25 to $250 per offense. Heavy trucking and long grades are limited, so posted zones are rare. Use your engine brake normally on grades like Saddle Road or the Maui descents where nothing is posted.
What to watch for
- Ban scope: None
- Where posted & enforced: Essentially no 'no engine brake' sign culture. Heavy trucking and long sustained grades are limited across the islands, so posted engine-brake zones are rare to nonexistent. The state muffler statute is the only real legal hook. On grades like the Big Island's Saddle Road or the Maui descents you will not typically face a posted engine-brake restriction.
- Muffler / noise law: Yes, the real legal hook
- Fine: $25 to $250 per offense for a muffler violation (HRS 291-24.5). No separate engine-brake fine in practice.
Hawaii Engine Brake FAQ
Are engine brakes banned in Hawaii?
Where are the "NO ENGINE BRAKE" signs in Hawaii?
What is the fine for using an engine brake where it is banned in Hawaii?
Reference information for planning, not legal advice. Traffic laws change and this can be out of date, so always confirm the current statute and obey posted signs before you rely on it. Last reviewed July 2026. Source: https://law.justia.com/codes/hawaii/title-17/chapter-291/section-291-24-5/. See our Terms & Disclaimer.
More for Hawaii
Check Hawaii before you roll
Live weather, closures, and hazards on one map. Free, no account.
Open Live Map →