VIN Prefix 5KK: Western Star (WMI)
VINs that start with 5KK are typically Western Star trucks, built by Daimler Truck North America. Here's what the prefix tells you — and what it doesn't.
Last updated: June 2026 · Data sources: NHTSA vPIC (live) and FMCSA public inspection records (periodic refresh).
Quick answer
The prefix 5KK is a Western Star World Manufacturer Identifier (WMI) — the first three VIN characters that identify the manufacturer. It does not identify a specific truck or its history. Enter the full 17-character VIN to decode the exact vehicle and check its FMCSA DOT roadside inspection history.
Free FMCSA roadside summary. We accept exact 17-character VINs only and never silently correct a VIN.
Why a prefix isn't enough
The WMI (5KK) only tells you the manufacturer. The remaining 14 characters encode the model, engine, GVWR, plant, model year, and serial number — and the full VIN is what FMCSA roadside records are matched against. For a Western Star VIN lookup, use the complete 17-character VIN.
Learn more
Frequently asked questions
- What truck brand is VIN prefix 5KK?
- VINs beginning with 5KK are typically Western Star, built by Daimler Truck North America. The first three characters (the WMI) identify the manufacturer, but you need the full 17-character VIN to identify and check a specific truck.
- Can I check DOT history from just the VIN prefix?
- No. A prefix identifies the manufacturer, not a specific vehicle. Enter the full 17-character VIN to check FMCSA roadside inspection history.