Why Fleets Are Using the RP1226 Connector in Their Vehicles

Telematics systems, dash cams, and ELDs are essential for fleet management today—improving safety, efficiency, and sustainability—but deploying these solutions at scale can be complex. Having a standardized installation protocol is critical to ensuring a smooth and successful rollout. One of the easiest ways to accomplish this is by using RP1226 connectors in your vehicles. A relatively new cable introduced specifically for heavy-duty vehicles, this connector provides a standardized and efficient interface for seamless vehicle connectivity, allowing fleet managers to access critical information about vehicle health, location, and driver behavior. This standardized connection not only simplifies the installation process but also guarantees compatibility across different vehicle models, saving time and effort when integrating Samsara solutions with your fleet. 

In fact, organizations operating vehicle models made in late 2019 and newer are encouraged to use the RP1226 connector to install telematics devices in your fleet, and using the RP1226 connector is a “recommended practice” from the 2015 TMC (ATA’s Technology and Maintenance Council). 

What is the RP1226 connector and what is it used for?

The RP1226 connector is a standard 14-pin connector used in heavy-duty vehicles. Its purpose is to establish a standardized electrical connection between the truck's cab and various devices or equipment. This connector enables communication and power transfer between the truck's electrical system and external devices. The RP1226 connector was introduced as a standardized cable—both in pin layout and design—to ensure compatibility across different manufacturers and vehicle models. Using vehicle data accessed by integrating the RP1226 connector with Onboard Diagnostic Ports, Samsara’s Vehicle Telematics solution surfaces insights used for electronic logging devices (ELDs), fuel management, GPS tracking, and more. 

Other considerations for the RP1226 connector:

• The location of the connector varies among OEMs. 

• OEMs implement different levels of data access through the RP1226 connector due to a combination of factors, including technical considerations, proprietary systems, regulatory requirements, and business strategies.

Why is the RP1226 connector replacing 9-pin connectors? 

Introduced in 2018 as an optional dedicated diagnostics port for heavy-duty vehicles, the RP1226 connector has surpassed 9-pin connectors as the approved cable for telematics devices for reasons such as standardization, expanded functionality, and ruggedized design. Here’s a closer look at why the RP1226 is replacing 9-pin connectors:

• Standardization and compatibility: Standardized connectors ensure compatibility across different vehicle manufacturers and models, making it easier to connect third-party devices. 9-pin connectors, such as the J1939 connector, have previously been accepted as the industry-standard cable, but today, most OEMs are moving toward the RP1226 connector. 

• More pins for enhanced functionality: As the name suggests, a 9-pin connector has nine pins, which limits the number of data and power connections that can be established. In contrast, the RP1226 connector has 14 pins, offering more options for data transfer, power supply, and communication between the vehicle and telematics devices. 

• Heavy-duty applications: The RP1226 connector is specifically designed for heavy-duty vehicles, which often require more robust and durable connections due to the challenging operating conditions they face. These connectors are built to withstand vibrations, exposure to harsh weather, and rough handling. While 9-pin connectors can be suitable for certain applications, they do not always meet the same durability requirements for heavy-duty vehicles.

• Industry acceptance: Over time, the RP1226 connector has gained acceptance and adoption within the heavy-duty vehicle industry. As more manufacturers and telematics providers align with these standards, the RP1226 connector has become the preferred cable for a consistent and reliable connection.

• Future-proofing: As technology advances and telematics applications evolve, a more robust and feature-rich connector like the RP1226 can better accommodate future needs. The additional pins and standardized design make it easier to adapt to new functionalities and emerging requirements in the telematics industry.

Benefits of using the RP1226 connector with your Samsara devices

Fleets experience many benefits of using the RP1226 connector to install Samsara devices in their vehicles, such as ensuring vehicle warranties remain valid. The top three benefits of using this cable include:

• Validate vehicle warranties: The RP1226 connector is the preferred, and approved, choice among many OEMs. In some instances, if the RP1226 port is available and not used for the telematics connection, it may void the vehicle’s warranty. It’s recommended that you read and understand the terms of your vehicle warranty coverage.

• Seamless integration: The RP1226 connector simplifies integrating Samsara Vehicle Telematics with your fleet. By having a standardized connector, you can ensure devices are universally compatible with your fleet, reducing installation complexities.

• Data collection and analysis: Samsara Vehicle Telematics rely on data collection from the vehicle's onboard sensors and systems. The RP1226 connector facilitates the flow of data, enabling Vehicle Gateways to access critical information, such as engine performance, fuel consumption, location, and vehicle health. This data is then aggregated in your Samsara Dashboard.

Using the RP1226 connector with Samsara devices

To quickly and easily connect Samsara devices to your vehicles with RP1226 connectors, you’ll need to locate the port in your vehicles (your OEM can provide detailed information on your vehicle’s RP1226 connector location). Common locations for the RP1226 connector include the center console, kick panel, and diagnostic port. Below are RP1226 port locations for six major OEMs:

Kenworth and Peterbilt: On the left-hand side of the steering wheel behind the dash/fuse panel cover

Volvo: Under the instrument panel

Freightliner: Behind the dashboard panel 

Mack: Under the instrument panel

International: Behind and below the cup holder

Once you’ve located your vehicle's port, you’ll connect the Samsara VG-B1226 or VG-CRP1226 cable (the vehicle's RP1226 port will remain accessible using the unconnected port on the y-cable). Complete your installation with these steps: 

• If you’re installing the VG-CRP1226, fasten the unconnected RP1226 port to the vehicle's original port location. 

• Once either cable is connected, verify the gateway indicator light is green—the USS/CAN hub is now fully functional. 

• Connect the existing gateway cable to the female 12-pin connector of the hub. 

• Use the ports on the hub to plug in any previously plugged devices. All functionality supported through the gateway will be supported through the hub. 

• Re-secure the gateway and cables to the vehicle using the zip ties provided.

RP1226 connector tips 

RP1226 connectors are extremely reliable and durable but in the event you experience issues, follow these simple tips to restore your connection:

• Check for physical damage: Inspect the RP1226 connector and its mating connector for any visible damage, such as bent or broken pins, damaged housing, or signs of corrosion. 

• Verify proper connection: Ensure that the RP1226 connector is securely plugged into its mating connector. Sometimes, a loose connection can cause intermittent electrical contact, leading to communication problems.

• Clean the connectors: Dust, dirt, and debris can accumulate in the connectors over time, hindering proper electrical contact. Use compressed air or electrical contact cleaner to clean both the RP1226 connector and its mating connector before reconnection.

• Inspect wiring and harness: Check the wiring harness connected to the RP1226 connector for any signs of damage, such as frayed wires or cuts. Damaged wiring can cause intermittent or no connectivity between the vehicle's electrical system and the connected device.

• Use proper pinout configuration: Ensure that the pins in the RP1226 connector match the correct pinout configuration specified for the connected device or equipment. Using an incorrect pinout can result in miscommunication or failed connections.

• Check fuse and circuitry: Verify the fuses and associated circuitry related to the RP1226 connector. A blown fuse or faulty electrical components can disrupt power supply and data transfer.

• Scan for error codes: Use appropriate diagnostic tools or onboard diagnostics to scan for error codes related to the RP1226 connector or connected devices. Error codes can provide valuable clues about the nature of the problem.

• Update firmware and software: If the RP1226 connector is used with telematics devices or electronic control modules, ensure that the firmware or software is up to date. Manufacturers may release updates to address compatibility or performance issues.

• Consult service manuals: Refer to the vehicle's service manuals or technical documentation for specific troubleshooting procedures related to the RP1226 connector. 

• Reach out to Samsara for assistance: If RP1226 connector issues persist, reach out to Samsara for troubleshooting help.

Learn more about installing RP1226 connectors in your fleet or reach out for assistance today →