46.1 SPN 597/FMI 13 This fault is typically the J1939 Service Brake Switch signal from Source #1, #2, or #3 is missing. 46.1.1 Missing Service Brake Switch Signal from Source #1, #2, or #3 Check Check as follows: 1. Check for multiple codes: [a] If CPC SPN 168/FMI /14/18 (Battery Voltage) are present troubleshoot these first.. I have a 2010 CE with multiple problems stemming from DTC 1222 / SPN 597 / FMI 2 for the brake light switch. I checked both switches on the brake valve, both have 12 volts with KOEO, and grounds are good as well. I ohmed the switches out just to be sure, and both are good. With KOEO, the code goes "Active" when brake pedal is pressed, and when.
SPN 597 FMI 2 is a fault code that indicates a problem with the service brake switch signal on a Freightliner truck. The service brake switch is a device that sends a signal to the engine control module (ECM) when the driver applies or releases the service brake pedal.. Detroit DD15 GHG14 (2014-16) Fault Code: SPN 597 FMI 2 (CPC) Service Brake Status Not Plausible. NOTE: Please see the step by step troubleshooting procedures for this specific code. PROBABLE CAUSES: 1. If any codes related to battery voltage are present, fix those first. 2. If 625-9 present, troubleshoot that instead.
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