
Is your fleet CARB-compliant?
Avoid costly fines – ensure your vehicles comply with the Clean Truck Check and aftermarket parts regulations.
Clean Truck Check compliance can save you thousands of dollars per truck in downtime and penalties
Geotab’s CARB-compliant T-harness eliminates the risk of fines

Webinar
How to comply with the Clean Truck Check regulations
The first deadline for CARB’s Clean Truck Check emissions testing program was January 1, 2025, and it’s not just for California fleets. Do your trucks meet the requirements?
Watch our on-demand webinar to discover how Geotab can help streamline your fleet compliance with the Clean Truck Check program. You’ll learn how you can automate emissions testing, minimize downtime and save money with Geotab's CARB-compliant Clean Truck Check solution.
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What is CARB compliance and how does it affect your fleet?
We’ve put together a comprehensive guide to help your fleet navigate the tricky terrain of CARB compliance.
What you will learn:
- How to meet CARB's requirements using our step-by-step breakdown, no matter where your fleet is based.
- How telematics can simplify compliance and help fleets remain cost-effective.
- How to protect your fleet's operations while contributing to cleaner air and public health.
Commonly asked questions about CARB compliance
What is the CARB standard for aftermarket telematics solutions?
California Vehicle Code sections 27156 and 38391 prohibit the advertising, sale, offering for sale, or installation of any add-on or modified aftermarket part for on- or off-highway vehicles that modifies the original design or performance of a California vehicle's emission control system, unless it is exempted by CARB.
Pursuant to Health and Safety Code section 43016, a maximum civil penalty of $42,450 is applicable to each sale, offer for sale, installation, or advertisement of any part, device or mechanism intended for use with, or as part of, a required motor vehicle pollution control device or system that alters or modifies the original design or performance of the motor vehicle pollution control device or system, and for which an anti-tampering exemption has not been issued by CARB pursuant to CVC section 27156 and California Code of Regulations, title 13, section 2222.
How does Geotab’s telematics solution meet the CARB standard?
For a product to be considered CARB-compliant, it must undergo extensive testing. If the product passes without harming a vehicle’s emissions control or measurement, it is assigned a CARB Executive Order (EO) number. Geotab’s GO Telematics Kit is the only aftermarket telematics solution with a T-harness to pass the rigorous CARB testing and receive an Executive Order.
Geotab’s GO Telematics Kit enables you to use one of our compliant T-harnesses to legally connect a Geotab GO9, GO9+ or GO9 Rugged telematics device to the OBD port of a vehicle without violating the CARB regulations. With support for both J1939 and J1979 protocols, our GO Telematics Kit ensures seamless compliance with emissions regulations for heavy, medium and light-duty vehicles.
What is the CARB Clean Truck Check program?
CARB’s Clean Truck Check is a program that aims to reduce greenhouse gas emissions within the transportation industry. It applies to heavy-duty, non-gasoline vehicles with a gross vehicle weight rating (GVWR) of over 14,000 pounds that operate in California (no matter where they are based). Under the program, fleets are required to test these vehicles for emissions on a regular basis and submit their results to CARB. The goal is to ensure fleet managers have the information they need to maintain and repair malfunctioning vehicle systems.
There are four methods for fleets to submit emissions-related data to remain in compliance:
- Certified testing facilities: Fleets may take their vehicles to be tested at a facility operated by CARB employees.
- Portable Emission Acquisition System (PEAQS): These systems are usually roadside and collect a snapshot of emissions data from your fleet vehicle.
- In-house Periodic Smoke Inspection Program (PSIP) with non-continuously-connected OBD scan tools: This requires an employee in-house to manually collect emissions data from your fleet vehicles.
- Employ a CARB-compliant telematics device to transmit data continuously: By utilizing a telematics device, fleets can collect emissions data continuously without inhibiting vehicle uptime.
What are the CARB-compliant solutions offered by Geotab?
1. Either a GO9®, GO9+® or GO9 Rugged® device.
2. A T-harness from the following list:
HRN-GS09K2
HRN-GS09K2-A
HRN-GS16K22
HRN-GS16K22-A
HRN-GR09K1
HRN-GR09K1-A
HRN-BD16S5
3. A CARB EO label, which needs to be applied under the hood.
In addition, our secure cloud platform, MyGeotab, features emissions reporting software, which records and automatically submits the information required for compliance with the Clean Truck Check program.
How does the GO Telematics Kit automatically gather and submit the required compliance data?
Geotab’s GO9 devices record data from the vehicle and upload it to the secure MyGeotab online platform. An application created specifically for this integration requests this data from MyGeotab, encrypts it and sends it to CARB servers.
The data collection process occurs while the vehicle is not moving on the first Ignition ON event after a new installation, and every seven days thereafter. While in cellular coverage, the submission process happens immediately once the data is available. While out of cellular coverage, the GO device stores up to 15 complete submission files on the device until cellular coverage is restored.
Do any other telematics vendors have a CARB Executive Order for a T-harness?
Geotab is the first and only aftermarket telematics solution vendor at this time to receive an Executive Order from CARB for a continuously connected T-harness. Geotab collaborated closely with CARB to ensure our telematics solutions meet CARB’s strict compliance standards.
Avoid CARB violations, streamline compliance and maintain uninterrupted access to your fleet telematics data
Find out how Geotab can provide you with continuous data insights while ensuring compliance with CARB’s gold standard for aftermarket telematics solutions and the Clean Truck Check program.