Installing telematics devices in heavy-duty trucks requires precise knowledge, especially when it comes to locating the OBD2 port. For those working with 2016 Mack and Peterbilt models, understanding the diagnostic port location is crucial for efficient installation and vehicle maintenance. This guide provides expert insights into finding the OBD2 location on these specific truck models, ensuring a smooth process for installing devices like Geotab GO.
Understanding OBD2 Ports in Heavy-Duty Trucks
Since 1997, most light-duty vehicles have standardized with a 16-pin OBDII (On-Board Diagnostics II) port. However, heavy-duty trucks, including Mack and Peterbilt, can have variations. While many utilize OBDII ports, they might also feature other diagnostic connectors like 9-pin (J1939) or 14-pin (RP1226) ports. For 2016 models, Mack and Peterbilt trucks commonly use a 9-pin or 16-pin diagnostic port, but the exact type and location can vary.
Comparison of different OBD ports in light-duty vehicles.
Note: While this image shows light-duty vehicle ports, it illustrates the general appearance differences between OBDII and other diagnostic connectors.
Locating the OBD2 Port in 2016 Mack Trucks
For 2016 Mack truck models, the diagnostic port location can generally be found in a few common areas. Keep in mind that specific placements can slightly differ based on the exact model and cab configuration.
Common Locations for 2016 Mack OBD2 Ports:
- Under the Dashboard: The most frequent location is beneath the dashboard on the driver’s side. You’ll typically need to look under the steering column or towards the center console area. It might be exposed or covered by a small panel.
- In the Glove Compartment: Some Mack models might position the diagnostic port inside the glove compartment. Check the upper or side walls of the glove box for a port.
- Engine Compartment (Less Common): Although less common for OBD2 ports, it’s worth a quick check in the engine compartment, especially near the firewall. This is more typical for older or specialized diagnostic connectors, but worth a glance if the interior locations are unfruitful.
Important Considerations for 2016 Mack Trucks:
- Port Type: In 2016, Mack trucks could utilize either a 9-pin or a 16-pin diagnostic port. Visually inspect the port to determine the type before selecting a harness. For 16-pin ports, the universal harness HRN-GS16K22-A is often suitable with the heavy-duty adapter HRN-CG13S1-A for 12/24V systems. For 9-pin ports, HRN-GS09K2-A is generally recommended.
- Clean Truck Check (CTC) Compliance (California): If the Mack truck operates in California and is part of the Clean Truck Check program, ensure that the chosen connector and device are compliant. For CTC compliance using a 16-pin port, a universal harness setup (HRN-CG13S1-A + HRN-GS16K22-A) is advised.
Locating the OBD2 Port in 2016 Peterbilt Trucks
Similar to Mack, 2016 Peterbilt trucks also present a few typical locations for their diagnostic ports. Again, variations can exist, so a thorough check is always recommended.
Common Locations for 2016 Peterbilt OBD2 Ports:
- Dashboard Area (Driver’s Side): Peterbilt often places the diagnostic port on the driver’s side dashboard. Look for it to the right of the steering column, possibly integrated into the dashboard panel or just underneath it.
- Below the Dashboard: Like Mack, Peterbilt may also position the port under the dash, closer to the firewall or center console.
- Behind a Panel (Center Console or Dashboard): In some Peterbilt models, the port might be concealed behind a small, easily removable panel in the center console or dashboard.
Important Considerations for 2016 Peterbilt Trucks:
- GO9 Recommendation: For 2016 and newer Peterbilt models, especially 2017+, utilizing a Geotab GO9 device or newer is highly recommended to ensure optimal compatibility and functionality. Older GO devices might have compatibility issues with certain engine types (MX13 and MX15).
- Port Type and Harness: Peterbilt trucks in 2016 predominantly used 9-pin diagnostic ports. For these, the HRN-GS09K2-A harness is the standard recommendation. While 16-pin OBDII ports might be present in some configurations, 9-pin is more typical for heavy-duty applications in this year.
- RP1226 Port Consideration: While less common for standard OBD2 connections in 2016 Peterbilt models, some might be equipped with a 14-pin RP1226 port. If an RP1226 port is available and preferred (though not for CTC compliance in California), the HRN-CS14S21 or HRN-CS14T2 harness can be considered for compatible devices. However, for general telematics and diagnostic access, the 9-pin or 16-pin OBD port is usually the target.
General Tips for Finding Diagnostic Ports
- Visual Inspection: Always start with a thorough visual inspection of the common locations mentioned above. Use a flashlight to illuminate dark corners under the dashboard.
- Consult Vehicle Manual: Refer to the vehicle’s owner’s manual. While it may not pinpoint the exact “OBD2” location, it might indicate the location of diagnostic connectors or ports.
- Online Resources: Online forums and truck-specific communities can sometimes offer model-specific advice on diagnostic port locations.
- Professional Installer Assistance: If you are unsure or encountering difficulties, consulting a professional installer is always a good option. Authorized installers have experience and can quickly locate the port and ensure proper device installation.
- Geotab Harness Compatibility Tool: Use Geotab’s harness compatibility tools and documentation to cross-reference the vehicle’s make, model, and year to recommended harnesses once you’ve identified the port type.
Choosing the Right Harness for 2016 Mack and Peterbilt Trucks
Once you have located the diagnostic port on the 2016 Mack or Peterbilt truck and identified whether it’s a 9-pin or 16-pin connector, selecting the correct harness is straightforward.
- For 9-Pin Ports: The HRN-GS09K2-A harness is generally the go-to choice for both 2016 Mack and Peterbilt trucks with 9-pin diagnostic ports.
- For 16-Pin Ports: If you find a 16-pin OBDII port, the universal T-Harness HRN-GS16K22-A, potentially paired with the HRN-CG13S1-A adapter for certain Mack models or 24V systems, is usually appropriate.
Always verify the port type visually before ordering harnesses. Misidentifying the port can lead to installation delays and incompatibility.
Disclaimer: This information is provided as a general guide based on common 2016 Mack and Peterbilt truck configurations. Actual port locations and types can vary. Always verify the specific vehicle’s diagnostic port before proceeding with any installation.
