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P1636 - Inductive Signature Chip Communication Error

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P1636 - INDUCTIVE SIGNATURE CHIP COMMUNICATION ERROR

For Expedition, F-150, F-Series Super Duty, Mustang, Navigator 
Description:  This DTC sets when the PCM has lost communication with the inductive signature chip.
Possible Causes: 
  • Low battery voltage
  • Battery or charging system concern
  • Damaged PCM
Diagnostic Aids:  Refer to the Automatic Transmission article.
For All Others 
Description:  This DTC sets when the PCM has lost communication with the inductive signature chip.
Possible Causes: 
  • Damaged PCM
Diagnostic Aids:  Check for other DTCs and diagnose those first. Clear the DTCs, repeat the self-test. If the DTC is retrieved again, install a new PCM. Refer to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) .
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All Refer to the Description, Possible Causes and Diagnostic Aids for the DTC.
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