My truck is a 2015 freightliner dd15 and its showing a code SPN 525 FMI 7 I recently changed a battery and then this code showed up with a check engine light. It's a automatic transmission it would try to engage to a gear until it stops
Need help with a code
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by JJDuran, Feb 26, 2020.