Vehicle noise in Lodi is governed primarily by the California Vehicle Code, not by a local Lodi ordinance. CVC 27150 requires an adequate muffler at all times; CVC 27151 prohibits modifying the exhaust to amplify sound, with a 95 dBA cap for light vehicles.
California Vehicle Code 27150 requires every motor vehicle subject to registration to be equipped with an adequate muffler in constant operation and properly maintained to prevent any excessive or unusual noise. Cutouts, bypasses, and similar devices are prohibited (with a narrow exception for sanctioned off-highway racing events). CVC 27151 prohibits modifying the exhaust system in a manner that amplifies or increases noise beyond CVC 27150 limits or the Article 2.5 type-specific limits beginning at CVC 27200. For exhaust systems on motor vehicles with a manufacturer's GVWR of less than 6,000 pounds (other than motorcycles), a sound level of 95 dBA or less, tested per the current SAE International standard, complies. Lodi enforces these statewide standards through Lodi Police traffic enforcement; cited drivers may be ordered to a Bureau of Automotive Repair Referee Center to verify exhaust compliance. Local LMC Chapter 9.24 nuisance provisions also reach standing or repeated vehicle-related noise (revving, idling, sound systems) that disturbs the peace.
Vehicle exhaust citations are issued under CVC 27150/27151. A correctable 'fix-it' citation typically requires referee inspection at a BAR Referee Center. Failure to correct can convert to a court fine. LMC 9.24 violations (e.g., car stereos clearly audible at 50 feet on public streets) are enforced separately by Lodi Police as infractions or misdemeanors per LMC Title 1.
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