On-road vehicle noise in Yuba City is enforced primarily under California Vehicle Code §§27150–27151 (mufflers and modified exhaust) and §27200 et seq. (vehicle noise limits), which preempt local on-road noise regulation. Chapter 17 covers off-road/idling vehicle disturbances on private property.
California Vehicle Code §27150 requires every motor vehicle to be equipped with an adequate muffler in constant operation, and prohibits cutouts or bypasses. §27151 prohibits modifying an exhaust system to amplify or increase noise; for vehicles under 6,000 lbs GVWR (excluding motorcycles), a 95 dBA sound level limit applies (SAE J1169/J1492 test). §27202 sets motorcycle noise limits (80–82 dBA depending on model year). AB 1824 (effective Jan. 2019) requires immediate citations for §27150/§27151 violations rather than 'fix-it' tickets. Yuba City Police enforce these on public roads; Code Enforcement handles vehicle noise originating from private property under Chapter 17's reasonable-person standard.
Vehicle Code §27150/§27151 fines run several hundred dollars after assessments; AB 1824 eliminated correctable-violation status, so first citations carry full fine. Chapter 17 private-property vehicle noise: up to $100 first offense, $200 second, $500 third.
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