It does sound like an issue with the powertrain control module (PCM). The code indicates an internal malfunction.
Take a look at the two pics below. The first one explains the code and the second provides the diagnostics for this code. If possible, perform the diagnostics and let me know what you find.
2014 Mazda 3 L4-2.0L (SKYACTIV-G)
Engine On-Board Diagnostics
Vehicle ALL Diagnostic Trouble Codes ( DTC ) Testing and Inspection P Code Charts P0600 P0600:00 Engine On-Board Diagnostics
ENGINE ON-BOARD DIAGNOSTICS
2014 - Mazda3 - Engine
DTC P0600:00 [SKYACTIV-G 2.0, SKYACTIV-G 2.5]
I will watch for your reply. If you have other questions, let me know.
Take care and God Bless,
Images (Click to enlarge)
Thursday, February 11th, 2021 AT 4:37 PM