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DTC P164C - Internal Control Module Start-Stop Performance

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2018 Ford Transit-350 HD, 2018 Ford Transit-350, 2018 Ford Transit-250, 2018 Ford Transit-150, and 2018 Ford F-550 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
P164C - INTERNAL CONTROL MODULE START-STOP PERFORMANCE

Description:  This DTC sets when an error occurs in the PCM.
Possible Causes: 
  • Module programming error
  • Aftermarket performance products
  • Damaged PCM
Diagnostic Aids:  This DTC may be accompanied by other DTCs. Check for other DTCs and diagnose those first. If no DTCs are present, continue to follow diagnosis for this DTC.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All GO to PINPOINT TEST AA .