Clean Truck Check questions, answered.

For scheduling, have your vehicle identification, engine model year, fuel type, testing deadline and appointment address ready. Tell us about warning lights, recent repairs, a disconnected battery or a previous unsuccessful test.

For mobile service, identify the on-site contact, gate instructions and when the vehicle will be available. Ask the team to confirm that the location is suitable. Do not send account passwords or card information in appointment notes.

Read the preparation guide or book a test.

For a routine compliance deadline, CARB allows a passing emissions test within the 90 days before that deadline. A Notice to Submit to Testing or another enforcement notice has separate instructions and must not be treated as a routine reminder.

Our recommendation is to leave time for an unexpected readiness issue or repair rather than plan your first attempt for the last day. Share any notice with the team before selecting an appointment.

Official source: CARB test timing.

Check each vehicle's deadline in CTC-VIS. Most covered vehicles currently follow a twice-yearly schedule; specified annual-testing categories differ. CARB's published schedule moves most OBD-tested vehicles to four tests per year beginning October 2027, while annual exceptions remain.

Use the actual vehicle record rather than a generic date calculator. Put that due date in your booking notes. A fleet's vehicles may not all have the same deadline.

Official source: CARB testing schedule.

Look for the engine manufacturer's emission control label. The engine year may differ from the vehicle year shown on your registration, particularly after an engine replacement. A missing or unreadable label should be resolved with the manufacturer rather than guessed from the truck's appearance.

For a CTCA inquiry, send the engine details you have and tell us what is uncertain. A clear label photograph can help our team review the appropriate appointment; do not remove or alter the label.

Official source: CARB engine-label guidance.

Generally, 2013 and newer diesel engines and 2018 and newer alternative-fuel engines use OBD testing. Older diesel engines require smoke opacity plus a visual inspection; older alternative-fuel engines require a visual inspection rather than a smoke test. Special engine configurations need individual review.

Choose OBD testing or opacity testing after confirming your engine details. Tell us about an engine replacement before booking.

Official source: CARB test-method requirements.

Clean Truck Check generally covers diesel and alternative-fuel vehicles over 14,000 pounds GVWR operating on California public roads, including many vehicles registered elsewhere. Exemptions and special categories apply.

Have the GVWR, fuel type, engine information and registration state available. Do not assume a personal-use vehicle or motorhome is automatically exempt. We can help identify the service to ask about; CARB determines the applicable requirements.

Official source: CARB program overview.

Contact the submitting tester with the vehicle identification, test date and message you see. Check that you are viewing the correct vehicle record. A device-provider screen is not a substitute for confirming the result in CTC-VIS.

For a CTCA appointment, contact our team. Do not create duplicate records or pay for another appointment just because one screen has not updated. First have the submission and vehicle details checked.

Official source: CARB missing-results guidance.

Start with the exact CTC-VIS result. A failed emissions test, an invalid submission, a software issue and a referral are not interchangeable. The next step may be a repair, a corrected submission or a CARB-directed process.

Keep the result and test date. Contact the submitting tester so the next appointment addresses that result rather than simply repeating the same attempt. Confirm the applicable retest terms with CTCA before scheduling.

Official source: CARB result-by-result guidance.

Not Ready means the data does not satisfy applicable readiness criteria; it is not a passing test. It can follow a code clear, battery replacement or repair. The criteria depend on vehicle data, so a fixed 'drive 50 miles and it will pass' promise is not reliable.

Ask your tester or repair provider what must be checked before the next attempt. Continue only with safe, appropriate vehicle operation; do not ignore a fault to accumulate driving time.

Official source: CARB readiness information.

Tell the team before booking. Do not clear codes simply to turn off a warning light before an emissions test. A repair or battery disconnection can affect readiness even when the dashboard light is no longer on.

A technician needs to assess the actual cause and condition. A booking confirmation is not a prediction that the vehicle will pass. Ask about readiness before traveling, especially when the vehicle has just returned from a repair shop.

Official source: CARB test-results guidance.

Registration outside California does not, by itself, exempt a covered truck operating in the state. Motorhomes have different rules: registration state and qualifying use matter. Do not apply a general 'all RVs are exempt' rule.

Tell us the registration state, fuel type, GVWR, engine details and vehicle use before choosing a service. Confirm vehicle-specific exemption questions or notices with CARB.

Official source: CARB covered-vehicle and exemption overview.

Not necessarily. A Clean Truck Check hold can involve reporting, annual fees and testing. Check all outstanding requirements and allow for processing. Resolving the emissions hold is separate from completing the remaining DMV registration transaction.

Bring the exact hold notice and vehicle record to the discussion. CTCA can help with the testing or portal-support scope, but we should not promise that one test will instantly clear every registration problem.

Official source: CARB DMV-hold guidance.

A testing charge and CARB's annual compliance fee are different items. Some CTCA CTC-VIS setup offers list the fee as included, so check the specific package and confirm what will be paid for your vehicle. A regular testing invoice alone is not proof that the annual-fee status in CTC-VIS has been updated.

Review your service quote and vehicle account separately. See our OBD and opacity pages for testing, or CTC-VIS support for the package description. Confirm the scope and total before authorizing the service.

Official source: CARB reporting, fee and testing requirements.

No. You can book a normal CTCA test without purchasing a device. CTCA is an authorized seller of ASAH Vehicle Gateway, an optional automated-testing route for compatible vehicles.

Ask the team to confirm compatibility, current plans and setup before ordering. Automated testing does not repair a vehicle, replace CARB fees or remove the owner's other compliance obligations.

Ask about AVG or book a regular test.

Start with a vehicle list grouped by yard, engine type and deadline. Include availability, an on-site contact and access instructions. That helps us plan the test mix rather than assume every truck needs the same service.

Request a quote before booking a multi-vehicle or multi-location visit. Fleet pricing has conditions; a count alone does not confirm the final rate. See fleet testing and check mobile coverage.