Detroit DD15 GHG14 (2014-16) Fault Code: SPN 677 FMI 31 (MCM, CPC) Starter Jammed (Tooth to Tooth Jam)
NOTE: This fault code indicates the starter teeth have not engaged correctly into the flywheel (jammed).
NOTE: Attempt to start the engine. If the engine starts correctly, attempt to start the engine three times. If the fault does not re-occur, clear code and release vehicle. The starter may not engage the flywheel.
POSSIBLE CAUSES:
1. Starter motor alignment.
2. Starter drive damage.
3. Incorrect starter installed.
4. Flywheel damage.
PROBABLE CAUSES:
1. Starter motor alignment.
2. Starter drive damage.
3. Incorrect starter installed.
4. Flywheel damage.
![International Truck ISIS - Oncommand Service Information Q4.2020 [04.2020]](https://www.ecuforcetruck.com/wp-content/uploads/2022/01/OnCommand-2020-1-300x300.png.webp)
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