The P0512 code on your 2020 Jeep Grand Cherokee indicates a malfunction in the starter request circuit. This circuit communicates between the ignition system, PCM, and starter motor system.
Starter Request System
Modern vehicles use electronic communication between the ignition switch, PCM, and starter. When you turn the key or press the start button, a signal is sent to the PCM which then authorizes starter engagement. P0512 indicates a problem in this communication chain.
Grand Cherokee Starting System
The 2020 Grand Cherokee uses push-button start with electronic communication between the start button, body control module, PCM, and starter. The system must verify key presence, security authorization, and proper conditions before allowing cranking.
Common Causes
The start button or ignition switch may be faulty. Wiring between the start signal and PCM may be damaged. The body control module may have issues. Security system interference can prevent start authorization. Neutral safety switch problems may affect start permission.
Diagnostic Approach
Use wiTECH to monitor start request signals through the system. Verify the start button or switch sends proper signal when activated. Check the neutral safety/park switch function. Verify security system is properly recognizing the key fob. Trace the starter request circuit for wiring issues.