California 90-day vehicle inspections and CHP BIT reviews explained

What the BIT program is

The Basic Inspection of Terminals (BIT) program, formerly the Biennial Inspection of Terminals, is administered by the California Highway Patrol under California Vehicle Code section 34501.12. Under it, the CHP inspects the terminals of motor carriers operating regulated vehicles in California, generally on a two-year cycle, and assigns the terminal a rating.

The inspection is of the terminal, not just a truck. Inspectors review your maintenance program, driver records, hours-of-service documentation and the condition of vehicles selected on site.

Where the 90-day interval comes from

CVC §34505.5 requires motor carriers to inspect covered vehicles at least every 90 days. This carrier vehicle inspection is separate from the CHP-conducted BIT terminal inspection, even though the CHP reviews these records during a terminal inspection.

The 90-day inspection is your own periodic inspection of the vehicle, documented and retained. It is separate from the driver's daily vehicle inspection report and separate from the federal annual inspection.

• Every regulated power unit and trailer inspected at intervals not exceeding 90 days
• The inspection documented, with defects noted and their repair recorded
• Records retained and available at the terminal for review

Terminal ratings and what they trigger

A terminal inspection results in a rating. A satisfactory rating means you continue on the normal cycle. A conditional or unsatisfactory rating means follow-up: reinspection, and in serious cases action against your operating authority or motor carrier permit.

Ratings are heavily influenced by documentation. Two carriers with identically maintained trucks can get different ratings if one of them cannot produce the paperwork.

The records that decide the outcome

The common failure is not missing maintenance. It is maintenance performed by a shop that emailed an invoice, filed nowhere, with no link back to the unit and no evidence of the defect that prompted it.

• 90-day periodic inspection reports for each regulated vehicle
• Maintenance and lubrication records showing a systematic program, not ad-hoc repairs
• Repair records showing defects found were actually corrected
• Driver vehicle inspection reports (DVIRs)
• Driver records including hours of service and controlled-substance testing where applicable
• Records for regulated trailers, not only power units

How to be ready without a compliance department

Practical readiness comes down to three habits: inspect on a fixed interval rather than when a truck looks rough, record the defect and its repair on the same record, and keep everything attached to the vehicle rather than to a date folder.

AssetStacc was built around that pattern. Each power unit and trailer carries its own 90-day interval, inspections capture photos and signatures, defects convert into work orders, and completed work is retained as a PDF on the asset. When an inspector asks for eighteen months of history on unit 214, it is one export.

Common questions carriers get wrong

• The 90-day inspection is not the same as the federal annual inspection under 49 CFR 396.17 — if both apply to you, you owe both.
• Trailers subject to the program need their own inspection records.
• A shop invoice is not an inspection report. It records a repair, not a systematic inspection.
• Being small does not exempt you. Applicability depends on the vehicles you operate, not the size of your company.