FOXWELL HD301 Heavy-Duty Truck Scanner — 16/9/6-Pin Diesel Code Reader, Full-System Diagnostics

The FOXWELL HD301 is a plug-and-play heavy-duty diesel and full-system truck scanner that reads and clears codes, shows live sensor data, and supports 6/9/16-pin truck protocols without subscriptions.

The HD301 combines a rugged hardware design with broad protocol coverage to help fleet managers, owner-operators, and diesel technicians diagnose commercial vehicles, pickups, and equipment on the spot. It includes a built-in 16-pin OBDII connector plus dedicated 6-pin and 9-pin adapters so older J1708/J1587 rigs and newer J1939 systems are both supported. No app, no Wi‑Fi, and no recurring fees make it a straightforward tool for roadside troubleshooting and routine shop diagnostics.

How does the HD301 identify problems across a truck’s systems?

HD301 performs full-system scans of accessible electronic control modules, not just the engine. It reads stored and pending trouble codes across Engine, Transmission, ABS, SRS, Chassis, and Body Control modules to reveal where faults originate.

• Retrieves and clears DTCs for multiple ECUs including ABS and transmission
• On-device DTC lookup library provides quick fault definitions
• Supports J1939, J1708, J1587 and standard OBDII protocols
• Compatible with major diesel brands: Cummins, PACCAR, Caterpillar, Detroit

What live data and testing functions does it provide?

The scanner displays essential real-time sensor readings in a stable text format so you can monitor system behavior while the engine runs. That data helps pinpoint issues like overheating, low fuel pressure, or irregular RPMs without guesswork.

• Live parameters: coolant temperature, engine RPM, fuel pressure, and more
• Text-based PIDs make logging and interpretation quick and reliable
• Read/erase capability for check-engine indicators and stored faults
• Note: does not perform DPF regeneration procedures

Which vehicles and equipment will this scanner work with?

Designed primarily for heavy-duty diesel trucks, the HD301 also covers pickups, buses, trailers, and many off-road machines. The combination of 16-pin OBDII plus 6- and 9-pin adapters extends coverage to older commercial models and wide-ranging engine platforms.

• Works with Freightliner, Kenworth, Peterbilt, International, Mack, and other truck makers
• Compatible with diesel engines from Cummins, PACCAR, Caterpillar, Detroit
• Useful for construction and agricultural equipment and some marine diesels
• Tip for light-duty diesel pickups: use the WWW-OBD menu for accurate testing

How easy is the HD301 to use and maintain?

The tool is built for on-the-road convenience: plug into the vehicle’s diagnostic port and start scanning—no battery charging, apps, or cloud setup required. FOXWELL provides lifetime free software updates so coverage stays current without subscription fees.

• Plug-and-play operation with immediate access to vehicle data
• No batteries, no Wi‑Fi, and no monthly subscription charges
• Multilingual support includes English and Spanish for broader usability
• Durable handheld design that fits fleet and field environments

Who is this for? The FOXWELL HD301 is aimed at fleet managers, diesel technicians, owner-operators, and anyone who maintains commercial vehicles or heavy equipment and wants a reliable, professional-level scanner without recurring fees. It’s a practical choice for shops that need broad protocol compatibility and quick on-site diagnostics, and for truck owners who prefer to troubleshoot and clear common faults themselves to reduce downtime and service costs.