SAE J1939 OBD2 Diagnostic Cable, Type 2 Green 9-Pin to 16-Pin Adapter

Last updated: 13 September 2026

Overview

A J1939 OBD2 diagnostic cable takes the round 9-pin diagnostic port found on
heavy vehicles and presents it as the familiar J1962 16-pin socket, so one scan tool, fault
reader or telematics dongle can work across a whole fleet. This is the Type 2 build: green
shell, the assignment used on most North American heavy trucks from the mid-2010s onward and on
a lot of construction and farm machines. It carries the CAN pair together with battery and
ground. It is a passive wiring adapter, not a protocol converter, and the bit rate it works at
is decided by the vehicle and the tool, not by the cable.

Key Specifications

The 9-pin pinout, letter by letter

The shell is a 9-position round connector with pins identified A through J — there is no I,
which trips people up the first time they read a pinout chart. The physical shell is the same
across the Deutsch HD10 and HD16 families; what changes between vehicle makers is what sits in
each cavity. Treat the table below as the common assignment, not as a guarantee, and build to
the pinout you measure or the one your tool vendor publishes.

That split between the two shells is where most wasted service hours come from. A tool that
expects the 250 kbps network on C and D will sit there silent on a truck where the 250 kbps
traffic lives on F and G, or on H and J, while C and D run at the faster backbone rate. The
shell color tells you which world you are in before you plug anything in.

Type 1 and Type 2 are not interchangeable

Same shell, same pin letters, different assignment. The two variants are keyed differently by
color and by the flange, and one will not substitute for the other in a mixed fleet.

• Type 2, green shell — the usual fitment on 2015-and-later North American
  heavy trucks and on many current construction and agricultural machines. Commonly quoted at
  500 kbps on the backbone pair with a second channel or the legacy link on the second pair.
• Type 1, black shell — still found on older tractors, coaches, generator
  sets and a large share of the European parc. Commonly quoted at 250 kbps with the legacy
  J1708 pair alongside.
• Mixed fleets — stock both. The cost of one wrong adapter is a truck off
  the road for a day, which dwarfs the price of the part.

250 kbps and 500 kbps: where the number actually lives

Bit rate belongs to the network and the controllers on each end, not to the copper. What the
cable contributes is length and balance: keep the run short, keep the pair twist up to the
contact, and terminate the drain properly, or you lose the margin the network needs at the higher
rate. That is why the stock lengths stop at 1 m.

Passive means passive

There is no chip in this cable. It does not translate between SAE J1939, SAE J1708 or any manufacturer-specific protocol,
and if your tool asks for a message the vehicle does not broadcast, this cable will not invent
it.

Construction

• Conductors for the CAN pair, battery and ground at 20 to 18 AWG, sized so voltage drop is
  negligible at the lengths offered.
• Aluminum foil plus tinned copper braid over the signal pair, with the drain terminated at
  the connector end.
• Oil-resistant PVC or TPU jacket for routing past engines, gearboxes and hydraulic lines.
• Overmolded strain relief at both connector bodies, which is where this type of cable
  normally fails first.

Lengths and options

Stock lengths are 0.3 m, 0.5 m and 1 m. The 0.3 m version holds the tool clear of the dash
panel; 1 m is the choice when the reader sits on a bench or a cart beside the cab. Longer runs,
right-angle bodies, unshielded cost-reduced builds and private-label overmold tooling are
available on request.

How to specify your build

1. Shell color — green Type 2 or black Type 1, read off the vehicle port.
2. Pin assignment — the standard one, or the one your tool vendor
   documents.
3. Length and whether you need a right-angle body.
4. Jacket — PVC for cab routing, TPU where it will see oil and weather.
5. Quantity, and whether you want both shell types in one shipment.

Typical applications for this J1939 OBD2 diagnostic cable

• Fleet service bays standardizing one scan tool across mixed model years
• Telematics dongles that need a J1962 socket on a truck with a round 9-pin port
• Roadside service vans working on construction and agricultural machines
• Diagnostic port extensions alongside our J1939
  9-Pin Y Splitter Cable for ELD and GPS trackers
• Workshops that still carry legacy tooling, paired with our black
  9-pin J1939 Type 1 adapter

Workmanship and testing

Assembly and inspection follow IPC/WHMA-A-620 Class 3 workmanship criteria under our ISO 9001 quality management system, and every unit passes 100% continuity and pinout testing before it is packed. Conductor range is 32 to 12 AWG. Where an ingress rating is specified we can quote seal checking on the production batch.

Custom builds and ordering

Prototypes run from 5 pcs with a 3 working day turnaround; volume orders start at MOQ 500 pcs
and ship 14 working days after sample sign-off. OEM and ODM orders ship under your part number
and labeling.

Related diagnostic leads

• J1939 9-Pin Y Splitter
  Cable for ELD and GPS Trackers
• Black 9-Pin J1939 Type 1
  Adapter to OBD2 16-Pin Socket
• DT06 to J1939 Adapter Cable
  for Tractors and Excavators
• Heavy-Duty
  9-Pin Industrial Diagnostic Cable Assembly
• OBD-II
  16-Pin to DB9 CAN Bus Diagnostic Cable, 25 ft

Full range: automotive
cable and wire harness.

Frequently Asked Questions