Operating a motor vehicle that produces exhaust noise in excess of the state's allowable decibel limits.
This guide is for general educational purposes only and does not constitute legal advice. TicketClear is a self-help document preparation service — we are not attorneys and do not represent clients. Review all prepared documents carefully before submitting. Fine amounts are estimates and vary by county and surcharge schedule.
CVC 27153(a) prohibits motor vehicles from emitting exhaust noise that exceeds statutory levels when the vehicle is in good working condition — targeting vehicles with modified or aftermarket exhaust systems designed to increase noise output. This goes beyond a simple muffler defect.
Excessive exhaust noise violations carry no DMV points, but they can be harder to resolve than a simple fix-it ticket if your exhaust system was intentionally modified. You may need to restore the exhaust to a compliant configuration.
No DMV points — no insurance impact.
Sports car with a loud aftermarket exhaust pipe is stopped at a traffic enforcement checkpoint.
Cited under 27153(a); driver must restore to factory-equivalent exhaust system or install a compliant aftermarket system.
Truck with diesel straight-pipe exhaust cited in residential neighborhood.
Straight-pipe (no muffler) exhaust is a clear violation; muffler must be installed.
These are the defense arguments that appear most often in successful Trial by Written Declarations for this violation.
Exhaust system was within noise limits
CVC 27153(a) prohibits excessive vehicle exhaust noise. Challenge the officer's subjective assessment with a professional exhaust noise measurement or manufacturer documentation.
Correctable violation
Repair or replace the exhaust system and get a Certificate of Correction.
⚠️ What NOT to Do
Optionally describe your situation — road conditions, time of day, officer position — and get a tailored document preparation overview.
Not necessarily. Aftermarket exhaust systems with a CARB Executive Order (EO) certification are legal. Non-compliant systems that exceed noise limits or alter emissions equipment are violations under CVC 27153 and emissions laws.
Upload your citation and TicketClear generates a personalized Trial by Written Declaration based on your specific situation. Starting at $49.99.
Check if my ticket qualifiesTakes 2 minutes. No payment required to check.
This guide is for general educational purposes only and does not constitute legal advice. TicketClear is a self-help document preparation service — we are not attorneys and do not represent clients. Review all prepared documents carefully before submitting. Fine amounts are estimates and vary by county and surcharge schedule.
Most California citations expire in 60 days. Check yours in 2 minutes. No payment required to see if you qualify.
Check my deadline, it's freeTakes 2 minutes. No payment required to check.