Duaparts Blog

The SPN 625 FMI 9 code indicates a missing heartbeat signal on the PT-CAN (Powertrain Controller Area Network), which is critical for communication between the engine control module and other components. This issue can lead to significant operational problems, including derate behavior in vehicles like the Freightliner Cascadia equipped with a DD15 engine. What This Code Means When the SPN 625 read more

SPN 513 FMI 9 indicates that the actual torque signal is not available through the CAN bus, which can lead to significant performance issues. This code often arises in modern diesel engines, such as the Freightliner Cascadia equipped with a DD15 engine, and can affect the engine's ability to perform optimally. What This Code Means The SPN 513 FMI 9 code signifies that the engine control module ( read more

This fault code indicates that the engine control module (ECM) is not receiving an engine speed signal via the Controller Area Network (CAN). This can lead to performance issues and potential derate behavior. What This Code Means SPN 190 FMI 9 signifies that the ECM is unable to detect the engine speed signal from the engine speed sensor through the CAN network. This lack of communication can re read more

The SPN 171 FMI 13 code indicates that the ambient air temperature signal is not available via the CAN bus. This can lead to incorrect fuel mapping and other performance issues in diesel engines. What This Code Means SPN 171 refers to the ambient air temperature sensor, which plays a crucial role in engine management by providing data for fuel mapping and emission control. FMI 13 signifies tha read more

SPN 168 FMI 0 indicates a high battery voltage condition in diesel engines. This fault code typically arises from electrical system issues that can affect the truck's performance and reliability. What This Code Means When you encounter SPN 168 FMI 0, it signifies that the engine control module (ECM) has detected a battery voltage level exceeding the normal operating range. Generally, this mean read more

This code indicates that the engine control module (ECM) is unable to receive the coolant temperature signal via the Controller Area Network (CAN). This can lead to improper fuel mapping and potential engine derate. What This Code Means SPN 110 FMI 9 signifies a loss of the coolant temperature signal, which is critical for the ECM to make informed decisions about fuel delivery and engine perfo read more

SPN 108 FMI 13 – Ambient Air Pressure Signal Not Available via CAN This fault code indicates that the engine control unit (ECU) is not receiving a valid ambient air pressure signal via the Controller Area Network (CAN). This issue can lead to poor engine performance and, in some cases, derate behavior if not addressed promptly. What This Code Means SPN 108 represents the ambient air pressure sens read more

What Does SPN 5246 FMI 0 Mean? SPN 5246 FMI 0 indicates that the aftertreatment system has entered an operator inducement condition due to an emissions-related failure. On trucks like the Freightliner Cascadia equipped with Detroit Diesel DD13 or DD15 engines, this code usually results in engine derate if not corrected. In simple terms:The truck detected an SCR/DEF system problem and is limiting read more

Is your New Cascadia with a DT12 transmission experiencing sluggish throttle response or delayed shifting?  This common drivability issue affects vehicles built between December 1, 2024, and January 25, 2025, due to incorrect TCM programming at the factory. Follow our verified solution to restore optimal performance. Affected Vehicles Model: Freightliner New Cascadia Transmission:&n read more

The U.S. trucking industry is facing a major shake-up. On October 1, 2025, a new 25% tariff on imported heavy-duty trucks will take effect, reshaping costs for fleets, manufacturers, and suppliers alike. For companies like Freightliner, one of America’s most recognized heavy-truck brands, the tariff creates both challenges and opportunities. What the Tariff Covers Scope: All heavy-duty truc read more