Are HOS247's Clean Truck Check devices CARB-certified?
Yes. HOS247 uses the Pacific Track PT40, a continuously connected device certified by CARB and listed on the official CARB OBD Test Devices page .
How to install CARB Clean Truck Check devices?
Continuously connected devices for Clean Truck Check plug directly into the vehicle’s diagnostic port—no professional installation required.
Does the engine need to be on for emissions testing?
Yes. Emissions tests require the engine to be on and idling.
Are tests performed while the vehicle is moving?
No. The device captures emissions data only when the vehicle is idling, not while driving.
Does the testing require any input from the driver?
No. Emissions tests run automatically while the vehicle is idling and do not require any input or action from the driver.
What data is included in CARB submissions?
The device transmits only the vehicle emissions data required by CARB for the Clean Truck Check test. No location data is included.
How often do vehicles need to complete Clean Truck Check tests?
Effective January 1, 2025, most heavy-duty vehicles are required to complete two emissions tests per year. Starting in 2027, the required number of annual emissions tests will increase from two to four per vehicle.
Can the CARB testing frequency be adjusted in the system?
Yes. The system allows operators to set and update the required testing frequency for each vehicle at any time.