45.1 SPN 596/FMI 13
This fault is typically the J1939 Cruise Control Enable Switch signal from Source #1, #2, or #3
is missing.
45.1.1
Missing Cruise Control Enable Switch Signal from Source #1,
#2, or #3 Check
Check as follows:
1. Check for multiple codes:
[a] If CPC SPN 168/FMI 0/14/18 (Battery Voltage) are present troubleshoot these first.
[b] If MCM SPN 625/FMI 9 is present, repair the CAN line faults.
[c] If only a “J1939 Error” fault is present, go to step 2.
2. Has the CPC been recently reprogrammed?
[a] If yes, check the proper configuration of the CPC.
[b] If no, connect ServiceLink to determine which modules are configured for the vehicle
and their communication status. Once this is done, follow the appropriate module
communication troubleshooting procedures for the affected module.
45.2 SPN 596/FMI 19
This fault is typically J1939 Cruise Control Enable Switch signal from Source #1, #2, or #3
is erratic.
45.2.1
Erratic Cruise Control Enable Switch Signal from Source #1, #2,
or #3 Check
Check as follows:
1. Check for multiple codes:
[a] If CPC SPN 168/FMI 0/14/18 (Battery Voltage) are present troubleshoot and repair
these first.
[b] If MCM SPN 625/FMI 9 is present, troubleshoot and repair the CAN line.
[c] If only a “J1939 Error” fault is present, go to step 2.
2. Has the CPC been recently reprogrammed?
[a] If yes, check the proper configuration of the CPC.
[b] If no, connect ServiceLink to determine which modules are configured for the vehicle
and their communication status. Once this is done, follow the appropriate module
communication troubleshooting procedures for the affected module.
