Autel 9‑Pin J1939 to 16‑Pin OBD‑II Diagnostic Adapter — Compact Passive Converter

Autel's original 9Pin J1939 male to 16Pin OBD2 female adapter converts a J1939 9-pin vehicle port into a standard OBD-II 16-pin socket for diagnostics and fleet devices. This compact adapter provides a space-saving bridge between heavy-duty vehicle J1939 systems and common OBD-II scanners or ELD trackers. Designed by Autel for use with diagnostic tools and fleet management equipment, it lets technicians and fleet operators connect OBD-II-compatible devices—such as Autel MaxiSYS and other scan tools—to vehicles equipped with a 9-pin J1939 diagnostic port without rewiring or bulky converters.

How does this adapter let my OBD-II scanner work with a 9-pin J1939 port?

The adapter presents a female 16-pin OBD-II socket on one side and the J1939 9-pin male on the other, mapping the vehicle’s J1939 signals to the OBD-II connector pinout used by many scanners. It is a passive mechanical converter—no electronics—so it relies on compatible protocols in the vehicle and scanner.

• Converts physical connector from J1939 9-pin male to OBD-II 16-pin female
• Pass-through for vehicle diagnostic signals when protocols match
• No internal active circuitry—compact and low-profile

Which tools and vehicles are compatible with this adapter?

Use this adapter with heavy-duty trucks and fleet vehicles that have a standard J1939 9-pin diagnostic port. It is intended for OBD-II scanners and fleet management devices that support the vehicle’s protocol—check your scanner’s specifications for J1939 or SAE J1939 compatibility before connecting.

• Works with many J1939-equipped Freightliner and other heavy-duty trucks
• Compatible with Autel MaxiSYS MS909CV, MS908CV and similar OBD-II scanners when protocol matched
• Designed for diagnostics, ELD tracking, and fleet telematics devices that expect an OBD-II socket

What are the physical features and warranty details?

The adapter is intentionally small to save space in crowded dash areas or diagnostic setups and functions as a connector rather than a cable. Autel backs the product with a one-year warranty and a 30-day return/replace policy for buyer confidence.

• Compact, plug-in adapter—not a lengthening cable
• Durable molded housing for frequent connect/disconnect cycles
• 1-year warranty plus 30-day no-reason return and replacement policy

How should I confirm it will work with my equipment?

Before buying, verify that your vehicle uses the J1939 9-pin diagnostic port and that your scan tool or fleet device supports the J1939 protocol or can read SAE J1939 messages via an OBD-II connector. If uncertain, consult your scanner’s manual or contact Autel support for guidance.

• Confirm vehicle port type: J1939 9-pin male required
• Confirm scanner or device supports J1939/SAE J1939 or equivalent
• Contact Autel support (autelonline@outlook.com) for compatibility questions

Who is this for This adapter is aimed at fleet technicians, heavy-duty truck owners, and mobile diagnosticians who need a reliable, low-profile way to use OBD-II scanners or ELD trackers on vehicles with a J1939 9-pin port. It’s ideal when you want quick, tool-free connections without adding cables or complex electronics—perfect for routine diagnostics, on-the-road troubleshooting, and fleet device installations.

FAQ

Q: Can I use this adapter with any OBD-II scanner?

A: Only if the scanner supports the vehicle's J1939 protocol; the adapter only converts the connector, not protocols.

Q: Does the adapter include a warranty?

A: Yes — Autel provides a one-year warranty plus a 30-day return or replacement policy.