I'm not sure this has the diagnostic blink code but it might just need a reset. These are out of the manual for this locomotive. The engine might thing it has a strobe light.
Reprogramming your locomotives to restore features I f your locomotives are unresponsive to your commands in the TrainMaster Command Control environment, we recommend that you follow this procedure to reset your locomotive set.
1. Slide the Command reverse unit switch on your locomotives to the PGM position. See pages 13, and 36 for the location of the Command Reverse Unit switch on each unit. Work with only one locomotive at a time.
2. Plug in and connect your Command Base.
3. Place your locomotive on the track, then power up the track.
4. Press ENG and enter the locomotive’s ID#.
5. Press SET.
6. Press ENG and enter the locomotive’s ID# again.
7. Press AUX1.
8. Enter 2 for this particular locomotive.
9. Turn off track power and wait ten seconds.
10. Slide the Command reverse unit switch back to the RUN position. Repeat these steps for each locomotive. At this point, your locomotive has been reset. Restore power to the track and operate the locomotive as usual. Be sure to use the ID# entered in Step 4.