Trucking Glossary

A code recorded by a control system to identify a detected condition. It guides diagnosis but is not proof of a particular failed part.

A control-system restriction on available engine power or operation. Causes and severity depend on the vehicle and condition.

A process that oxidizes accumulated soot in a diesel particulate filter under controlled conditions. Types and operating requirements vary.

Diesel Particulate Filter: a device trapping particles in diesel exhaust. Regeneration burns off accumulated soot; remaining ash may require cleaning according to the manufacturer. Restriction or faults can reduce available engine power.

Planned inspection and servicing based on time, mileage, use or manufacturer requirements to reduce preventable failures.

A description of proposed work and expected charges before repair, distinct from the final invoice. Added work may require further agreement.

A shop record of reported concerns, agreed work and service activity; terminology and layout vary.

A charge for investigating, testing or diagnosing a problem, potentially payable even when repair is not authorized.

The pricing rate for labor, often per hour. The total also depends on billed hours and the agreed pricing method.

Service provided at the vehicle's location, distinct from towing to a shop and limited by available equipment and conditions.

Time a vehicle is unavailable for transport because of repair, waiting or another cause. Payment for losses depends on applicable terms.