Engine fault code

On Saturday and today the car stereo system keeps shutting off and restarting on its own for approximately one to two minutes along with the engine. Gave a jump and then shut off and restarted within one minute after the stereo system did its own shut off and restart.
The same happened today, however the engine did not restart and the check engine light was on.

I used a Launch Creader VIII scan tool and the engine code read
P1320 -ignition signal-Primarygtc status 29.

Check engine light off.

What do I need to do now?