California Air Resources Board

Please read these instructions to accurately complete the separate vehicle emissions control equipment inspection form.

You must use the separate Vehicle Emissions Control Equipment Inspection Form to conduct the Vehicle Emissions Control Equipment Inspection (visual inspection) on heavy-duty vehicles without on-board diagnostic (OBD) systems.

The Vehicle Emissions Control Equipment Inspection Form is required in section 2198, title 13, California Code of Regulations (CCR), Heavy-Duty Inspection and Maintenance Regulation (HD I/M), also known as Clean Truck Check.¹ 

General Information: Vehicle Applicability 

The Vehicle Emissions Control Equipment Inspection must be performed on any non-OBD heavy-duty vehicle that receives a Notice to Submit to Testing starting in January 2023 to meet Clean Truck Check requirements. The Clean Truck Check emissions compliance testing requirements are effective on October 1, 2024, and the Vehicle Emissions Control Equipment Inspection must be performed on any non-OBD heavy-duty vehicle subject to Clean Truck Check. Non-OBD vehicles are those with: 

• 2012 and older model year diesel engines or diesel hybrid systems or 2017 model year and older alternative fuel engines or alternative fuel hybrid systems, or
• The vehicle is an on-road vehicle equipped with an off-road engine.² 
• 1: The final HD I/M Regulation is contained in sections 2195 through 2199.1, title 13, CCR.
• 2: An off-road engine used in an on-road vehicle is a rare situation and must have been previously approved through a CARB issued waiver. 

Instructions for Completing the Vehicle Emissions Control Equipment Inspection Form 

Vehicle Information, Registered Vehicle Owner, and Clean Truck Check Tester Information 

• Fill in all requested information on the registered vehicle owner, the vehicle/engine, and the Clean Truck Check Tester conducting the inspection. 
• Please use your computer or device to submit the information. If you must handwrite, please write legibly as these forms must be reviewed. 

Vehicle Emissions Control Equipment Checklist 

Emission Control Label (ECL): 

• Please check a box for ECL Condition: Clear and Readable, Faded/Not Readable, or Missing 
• Please fill in engine family name, manufacturer, engine model, and year.  
• A missing or illegible ECL will result in the vehicle failing the Vehicle Emissions Control Equipment Inspection and the Clean Truck Check compliance test. 

Visual Inspection of the Emissions Control Components: 

• Perform a visual inspection of all emissions control components listed on the ECL. 
• Refer to reliable sources of engine and vehicle technical specifications, such as service and repair manuals, or other reliable published sources for information on the proper configuration of each emissions control component. 
• The Vehicle Emissions Control Systems Inspection section (page 2 of the Form) includes a detailed components list.  
• Upon completing the inspection of each emissions control component, record the findings in the Vehicle Emissions Control Systems Inspection section (page 2 of the Form) using one of the following designations in the applicable column for each component. 
• Pass 
• Needs Repair 
• Not Applicable 
• For components NOT listed on the ECL, check the Not Applicable box because a component that is not identified on the ECL is not required. 
• Any vehicle with a missing, modified, defective, or disconnected emissions control component or system will fail the Vehicle Emissions Control Equipment Inspection and the Clean Truck Compliance Test. 
• Please see below for details on the inspection criteria for each component. 

Retrofit DPF – VDECS Family Name 

A diesel vehicle with a 2006 or older model year engine may be equipped with a VDECS, often referred to as a retrofit DPF, that requires the inspection steps in the table above to verify Clean Truck Check compliance. If the vehicle has a retrofit DPF, provide the VDECS family name found on the VDECS label.  

• For vehicles equipped with a VDECS, there should be two VDECS labels: one located on the VDECS itself and the other located on the engine (separate from the ECL).  
• Be advised: It is illegal to use a non-verified diesel retrofit device or install a VDECS on an engine/vehicle for which it is not verified. CARB staff will determine that trucks in these conditions will fail the Vehicle Emissions Control Equipment Inspection, the Clean Truck Check Compliance Test, and may issue a citation for tampering. 
• Component that Needs Repair 
• Please provide details of the necessary repair in the box above Credentialed Clean Truck Check Tester Certification 
• Credentialed Clean Truck Check Tester Certification 
• Please Sign, print your name, and enter the date of inspection. 
• By signing and submitting this form to CARB, you are attesting that you have fully and accurately performed this inspection in accordance with the requirements of Clean Truck Check.  
• There may be significant penalties for submitting false statements and information or omitting required statements and information. 

Instructions for Submitting the Vehicle Emissions Control Equipment Inspection Results to CARB 

Only credentialed Clean Truck Check testers may perform the Vehicle Emissions Control Equipment Inspection and submit this form. Forms associated with standard emissions compliance testing must be submitted to non-obd-test-submission@arb.ca.gov. 

• The subject line of the email to CARB must contain only the VIN; 
• Example: JN3MS37A9PW202929 
• Scan the completed and signed Vehicle Emissions Control Equipment Inspection Form and include as an attachment to the email. Note that the Form has two pages, and you must scan and submit both pages as a single document to CARB. 
• If applicable, scan, upload, and attach the accompanying smoke test opacity receipt or electronic test results (if the smoke meter has the capability of uploading results directly to your computer) in the same email. 
• CARB will send an autoreply to the HD I/M Tester confirming receipt of the Non-OBD Vehicle Compliance Test email. 

A test associated with a Notice to Submit to Testing from CARB enforcement should be sent to hdvehicleenforcement@arb.ca.govand include the following: 

• Non-OBD Vehicle Compliance Test; VIN; HD I/M Tester ID 
• Example: Non-OBD Vehicle Compliance Test; JN3MS37A9PW202929; IB032459