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February 4, 2026 Service bulletin

Condition where the CARB Clean Truck Check will not pass due to a “Test Results Could Not Be Determined” error

Hino technical service bulletin 167-B2601-1 for 2023-2024 Hino Conventional Models.

Bulletin number
167-B2601-1
Component
Electrical system
Summary
Some vehicles may exhibit a condition where the CARB Clean Truck Check will not pass due to a “Test Results Could Not Be Determined” error. Units equipped with the Hino Edge Telematics system may require a software update to resolve the error.

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