Detroit DD15 GHG14 (2014-16) Fault Code: SPN 523 FMI 13 (MCM, CPC) Transmission Current Gear Signal Missing
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.
3. If any engine modules have been programmed recently, check configuration.
4. Another computer module on the truck (ABS, transmission, cab, etc…) has a failure that is causing this.
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