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DTC U0401:68 [Advanced Keyless Entry And Push Button Start System]: Notes

WARNING: This page is about a different car, the 2010 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.
DTC U0401:68 (ADVANCED KEYLESS ENTRY AND PUSH BUTTON START SYSTEM) DETECTION CONDITION AND POSSIBLE CAUSE

DESCRIPTION Receiving erratic data from PCM
DETECTION CONDITION 
  • Keyless control module receives the erratic data from PCM when the ignition switch is ON.
POSSIBLE CAUSE 
  • PCM DTC is stored
  • PCM malfunction
  • Keyless control module malfunction
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