YPP OBD-II to J1939/J1708 Split Y Cable - Green 9-pin & 6-pin Adapter, 1 ft, Overmolded 20 AWG

The YPP OBD to Type 2 Green9p J1939 and 6p J1708 split Y cable converts J1939/J1708 truck diagnostic ports into a single OBD-II connection for diesel vehicle scanners and diagnostic tools.

Many heavy-duty diesel trucks use manufacturer-specific 9-pin J1939 and 6-pin J1708 ports instead of the common OBD-II plug found on lighter vehicles. This rugged, 1 ft (30 cm) split Y cable from YPP adapts those legacy green 9-pin and 6-pin connectors into a standard OBD2 interface, letting technicians and fleet managers connect modern scan tools, handheld readers, or telematics devices without rewiring or modifying the truck’s harness. The cable is built for workshop use, with overmolded connectors and thick 20 AWG conductors designed for frequent plugging and unplugging.

How does this cable simplify heavy-duty diesel diagnostics?

By bridging the physical and electrical gap between legacy J1939/J1708 ports and OBD-II diagnostic tools, the split Y cable eliminates the need for multiple adapters or custom harnesses. It allows a single OBD-II scanner to communicate with ECU networks that use the green 9-pin J1939 or 6-pin J1708 interfaces, saving time during inspections and repairs.

• Converts 9-pin J1939 and 6-pin J1708 ports to an OBD-II connector
• Supports common diesel diagnostic protocols used in heavy-duty trucks
• One short 30 cm cable keeps workbench and cab clutter minimal

Will this cable withstand daily shop and field use?

Yes — connectors are fully overmolded to resist strain, moisture ingress, and frequent handling, while the internal wiring uses robust 20 AWG conductors for reliable signal transfer. The short length reduces cable stress and snag risk when technicians move between inspection points.

• Fully overmolded connectors for mechanical durability
• Thick 20 AWG wires for stable electrical connections
• Compact 1 ft (30 cm) length reduces wear and tangling

Which vehicles and tools are compatible with this adapter?

The cable targets heavy-duty diesel trucks and equipment that employ green 9-pin J1939 and 6-pin J1708 diagnostic ports. It is intended for use with OBD-II-compatible scanners, handheld diagnostic tools, and telematics devices that accept an OBD2 input and can interpret J1939/J1708 messages.

• Works with trucks and engines using J1939 and J1708 protocols
• Ideal for OBD-II scanners, code readers, and telematics dongles
• Not a power supply — intended strictly as a signal/interface adapter

How do I use the split Y cable correctly?

Connect the green 9-pin J1939 and/or 6-pin J1708 plug(s) to the vehicle’s diagnostic receptacle(s), and then plug your OBD-II scanner into the cable’s OBD2 connector. If both vehicle ports exist, choose the matching protocol required by your tool; the adapter presents the appropriate wiring for those legacy ports to the OBD-II device.

• Plug green 9-pin or 6-pin into the truck’s diagnostic port
• Insert your OBD-II scanner into the adapter’s OBD2 end
• Select the correct protocol on your diagnostic tool before reading data

Who is this product for? Fleet technicians, independent diesel mechanics, mobile service operators, and diesel-focused telematics installers who need a straightforward, durable interface between legacy heavy-duty diagnostic ports and standard OBD-II tools will benefit from this YPP cable. Its short form factor and tough construction make it especially useful for busy shops and on-road diagnostics where quick, reliable connections matter. Note: this adapter converts physical connectors and wiring for diagnostic communications — consult your diagnostic tool documentation to confirm protocol support before use.