SPN 904/FMI 19 This fault is typically the front axle speed signal is erratic.‪ Check as follows:‪ Check for multiple codes: If CPC SPN 168/FMI…

SPN 973/FMI 13 This fault is typically the engine retarder selection signal is missing.‪ Check as follows:‪ Check for multiple codes: If CPC SPN 168/FMI…

SPN 973/FMI 9 This fault is typically the J1939 EBC1 (Engine Brake Switches) is missing.‪ Check as follows:‪ Check for multiple codes: If CPC SPN…

SPN 986/FMI 9 This fault is typically the J1939 CM1 message is missing.‪ Check as follows:‪ Check for multiple codes: If CPC SPN 168/FMI 0/14/18…

SPN 973/FMI 19 This fault is typically the engine retarder selection signal is erratic.‪ Check as follows:‪ Check for multiple codes: If CPC SPN 168/FMI…

SPN 1071/FMI 3 This fault code indicates that there is a short to power.‪ Check as follows:‪ Turn the ignition OFF. Disconnect the fan control…

SPN 1071/FMI 5 This fault code indicates that there is an open circuit.‪ Check as follows:‪ Check for multiple codes. If SPN 647/5, SPN 1072/5…

SPN 1071/FMI 4 This fault indicates that there is a short to ground.‪ Check as follows:‪ Turn the ignition OFF. Disconnect the fan control solenoid.…

SPN 1072/FMI 5 This fault code indicates that the Jake Brake Stage 1 circuit failed open.‪ Check as follows:‪ Disconnect the front injector valve cover…

SPN 1072/FMI 4 This fault code indicates that the Jake Brake Stage 1 circuit failed low.‪ Check as follows:‪ Disconnect the front injector valve cover…