On-road vehicle noise in Menifee is governed primarily by state law: California Vehicle Code §27150 (adequate muffler in constant operation) and §27151 (no exhaust modification that amplifies noise — 95 dBA cap for vehicles under 6,000 lb tested per SAE J1169). Cities cannot impose stricter operational decibel limits on on-road vehicles (CVC §21 preemption). Local enforcement: Riverside County Sheriff (contract police) issues CVC citations; Menifee adds local layer via MMC §11.07.020 (Unruly or Loud Conduct) for stationary vehicle noise — e.g., parked car with stereo blasting, repeated revving, idling trucks — and §9.210.060 for noise from off-street vehicle staging (delivery yards, drive-throughs).
California Vehicle Code §27150 requires every motor vehicle to have an 'adequate muffler in constant operation and properly maintained to prevent any excessive or unusual noise,' and prohibits cutouts, bypasses, and similar devices. §27151 (effective Jan 1, 2023, as amended by SB 570) prohibits modifying the exhaust system in a manner that amplifies noise and sets a 95 dBA SAE-tested limit for vehicles under 6,000 lb (excluding motorcycles, which have separate standards). These provisions preempt local regulation of in-traffic noise — Menifee cannot, for example, cap engine RPM or set a local dBA limit at the curb. What Menifee CAN regulate: (a) stationary vehicle noise on private property (loud car stereos in driveways, drag-style revving, modified exhausts run in a residential cul-de-sac) under MMC §11.07.020 and §9.210.060; (b) commercial truck idling under air-quality and nuisance provisions (CARB anti-idling rule, 13 CCR §2485, caps diesel truck idling at 5 minutes); (c) off-road and unregistered vehicle noise on private property — fully local. Aftermarket exhaust complaints typically go to Sheriff (CVC enforcement); residential disturbance complaints go to Code Enforcement (MMC enforcement).
CVC §27150/§27151 violations: California vehicle infraction (correctable; bring vehicle to compliance and sign-off required). MMC §11.07.020 violations: infraction citation by Sheriff or Code Enforcement. CARB anti-idling violations: California Highway Patrol or Air Resources Board; penalties up to $300 per incident. Repeat residential modified-exhaust complaints can be supplemented with §9.210.060 nuisance abatement.
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