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This fault indicates a high reading from the DEF tank level sensor circuit, typically pointing to an open circuit or a short to the 5V reference. Common causes include an unplugged sensor, a broken signal wire, or harness damage. What This Code Actually Means The "failed high" status usually suggests that the signal wire is either open or shorted to the 5V reference voltage. When the ECM detects read more

This code indicates a low voltage signal from the DEF tank level sensor circuit. It suggests an electrical fault rather than a mechanical issue with the tank itself. What This Code Actually Means A 'failed low' condition signifies that the voltage signal from the DEF tank level sensor is below the expected range, typically indicating a short to ground, a broken ground reference, or an internal f read more

This article delves into the SPN 1033 FMI 2 fault code, which indicates issues with the ACM2.1 engine hours data being erratic, intermittent, or incorrect. This is particularly relevant for technicians working with Freightliner Cascadia models equipped with the DD15 engine. What This Code Means SPN 1033 FMI 2 is triggered when the engine control module (ECM) detects that the data regarding engin read more

SPN 625 FMI 2 indicates a failure in communication with the Central Processing Controller (CPC), often seen in Freightliner Cascadia models equipped with the DD15 engine. This fault code typically suggests that the CPC has either stopped sending messages or is not receiving them correctly, leading to potential performance issues. What This Code Means SPN 625 FMI 2 specifically refers to the abse read more

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 resu 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 that th 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 means th 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 performa read more