SPN 523/FMI 13 This fault is typically the transmission current gear signal is missing.‪ Check as follows:‪ Check for multiple codes: If CPC SPN 168/FMI…

SPN 527/FMI 9 This fault is typically the J1939 CCVS message from Source #1, #2, or #3 is missing.‪ Check as follows:‪ Check for multiple…

SPN 523/FMI 9 This fault is typically the J1939 ETC2 message is missing.‪ Check as follows:‪ Check for multiple codes: If CPC SPN 168/FMI 0/14/18…

SPN 558/FMI 1 This fault is a typically incorrect wiring of the Idle Validation Switch (IVS).‪ Check as follows:‪ Connect the diagnostic tool Turn ignition…

SPN 558/FMI 4 This diagnostic condition is typically either a short to ground or an open wire.‪ Check as follows:‪ Disconnect the Idle Validation Switch.…

SPN 558/FMI 3 This diagnostic condition is typically an open circuit.‪ Check as follows:‪ Disconnect the Idle Validation Switch. Turn the ignition ON (key ON,…

SPN 596/FMI 19 This fault is typically J1939 Cruise Control Enable Switch signal from Source #1, #2, or #3 is erratic.‪ Check as follows:‪ Check…

SPN 596/FMI 13 This fault is typically the J1939 Cruise Control Enable Switch signal from Source #1, #2, or #3 is missing.‪ Check as follows:‪…

SPN 597/FMI 19 This fault is typically J1939 Service Brake Switch signal from Source #1, #2, or #3 is erratic.‪ Check as follows:‪ Check for…

SPN 597/FMI 13 This fault is typically the J1939 Service Brake Switch signal from Source #1, #2, or #3 is missing.‪ Check as follows:‪ Check…