Diesel Laptops CAN3-to-CAN1 Cross Over Converter Adapter — Compact inline CAN crossover for diagnostics, 24-month warranty

The Diesel Laptops CAN3 to CAN1 Cross Over Converter Adapter routes engine CAN 3 data into CAN 1 so standard diagnostic tools can read engine parameters on affected trucks.

This compact adapter resolves a common wiring mismatch found on certain model heavy-duty trucks and engines where engine data travels on CAN 3 instead of the more typical CAN 1 bus. Without the correct crossover, diagnostic interfaces and heavy-duty scan tools cannot access engine parameters, fault codes, or live sensor data. The Diesel Laptops adapter converts the signals so virtually any industry-standard diagnostic unit recognizes engine traffic as if it were on CAN 1.

Which vehicles require this CAN3-to-CAN1 crossover adapter?

If a truck’s engine data is on CAN 3 rather than CAN 1, you need this adapter. Known examples include newer model Peterbilts and Kenworths beginning in 2016 and many Cummins-equipped installations. Installing the adapter ensures compatibility with tools that expect engine traffic on the primary bus.

• 2016 and newer Peterbilt models with CAN 3 engine traffic
• 2016 and newer Kenworth models with CAN 3 engine traffic
• Cummins engine installations where engine data is routed to CAN 3
• Other trucks with OEM wiring that places engine messages onto CAN 3

Will this adapter work with my diagnostic tool or interface?

Yes — the Diesel Laptops CAN3-to-CAN1 adapter is designed to be compatible with the major diagnostic adapter brands and most OEM tools. It merely reassigns the CAN physical wiring so your existing tool reads engine traffic without special programming or additional hardware.

• Supports Nexiq USB Link (original and USB Link 2)
• Compatible with DG Tech DPA5 and DPA5 Plus interfaces
• Works with Noregon DLA 2.0+ and DrewTech DrewLinQ/TVIT
• Operates with Cummins Inline 5/6/7 and CAT Comm III adapters

How do I install and use the crossover adapter?

Installation is straightforward: connect the adapter inline between the truck harness and your diagnostic interface. No tool-specific configuration is needed; once connected, your scan tool will see engine CAN messages on the expected CAN 1 channel. The adapter is compact and built to handle workshop conditions.

• Plug the adapter between vehicle OBD/diagnostic port and your tool
• No software changes or additional drivers required
• Durable housing for repeated workshop use
• 24-month warranty included for peace of mind

What else is included and what are the product benefits?

Along with the converter cable you get a complimentary 30-day subscription to Diesel Repair to help with service information and troubleshooting. The adapter’s universal compatibility reduces downtime by allowing one diagnostic setup to work across affected trucks without rewiring or buying a second dedicated tool.

• Free 30-day Diesel Repair subscription with purchase
• Compact, durable design that fits tight diagnostic bays
• Universal fit across leading diagnostic adapter brands
• Two-year (24-month) warranty for reliability

Who is this for? Fleet technicians, owner-operators, and independent heavy-duty repair shops that service 2016-and-newer Peterbilt and Kenworth trucks, Cummins-equipped units, or any vehicle where engine data appears on CAN 3 will find this adapter essential. It’s ideal for teams that standardize on a single diagnostic interface and need a quick, reliable way to access engine data across mixed fleets without changing tools or modifying vehicle wiring.