Drove pickup and got check engine light came on while breaking. Returned home and turned on ignition switch 3 times. Got p done code. What does this mean.

THAT really sounds like someone is pranking you by swapping your car for another car just like it.

Up to this point in time, mechanic 1 has only done some maintenance work on the car. Things that would be done from time to time to maintain the car.
Since you have lost trust in this mechanic, I would go to a different place and have them diagnose the codes. If the second place gives you the same recommendation you can decide what to do.
You can tell the second place you are getting a second opinion, or not.

I would look at the ignition switch and the neutral safety switch for voltage. It could be the ignition switch is worn out and not making contact with all of the circuits. The neutral safety switch would be affected by moving the shifter.

there is a code in the pcm that will have to be checked out fix this

Check and make sure you are getting power to the ignition switch and to the stator wire on the starter. Turn the key on and and measure the volts going to the starter on both wires. You should a atleast 12 volts going to the stator wire and to the main wire from the battery. If you are not getting power there it could be a fuseable link in the power wire from the ignition. I noticed that you replaced the ignition switch make sure the rod from the key switch has not come out of the switch.

FIRST YOU TURN IGNITION SWITCH ON WITH ENGINE OFF.LOOK AT MIL LIGHT IT SHOULD COME ON 3 SECONDS THEN GO OFF IT NOT THEN YOU GOT BURN OUT BULB OR A CIRCUIT PROBLEM.IF ALL IS WELL. ATTEMPT TO START ENGINE.TURN OFF IGNITION. WITH OUT STARTING ENGINE.TURN IGNITION ON OFF ON OFF AND WITHIN 5 SECONDS RECORD 2 DIGIT DIAGNOSTIC TROUBLE CODES.DISPLAYED BY FLASHING MIL LIGHT.YOUR MIL FLASHES WILL BE YOUR CODE LIKE THE MIL LIGHT FLASHES 5 TIMES THEN PAUSE FLASHES 3 TIMES THAT CODE 53 THAT YOUR CODE.IT LIKE MORSE CODE.WHEN DONE TURN OFF IGNITION SWITCH.GO TO AUTO ZONE OR ADVANCE AUTO GET HAYNES COMPUTER CODE BOOK. TO GET CODE MEANING OR WHAT SENSOR GONE BAD.HOPE THIS CAN BE SOME HELP.

its the IG switch circuit or the IG switch Or ECU Which all means that check your Computer behind the right side kick panal for a good connection on everything and check the IG switch which is the ignition switch its located under the dash connected to your ignition

sounds like your plug wires are breaking down have them replaced along with your spark plugs!

Confirm the condition of your battery then check the ignition switch and power distribution box for any loose connections

It sound like you are having a electrical problem.You need to check your electrical/ignition system,not all electrical problem the diagnostic machine can read.