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Security Light 23, DTC B2139/P1260 [Immobilizer System (Keyless Entry System)]: Notes

WARNING: This page is about a different car, the 2007 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.
SECURITY LIGHT 23, DTC B2139/P1260 DETECTION CONDITION AND POSSIBLE CAUSES

SECURITY LIGHT: 23  ID number data in the PCM and the instrument cluster do not match.
DTC:  B2139/P1260  
DETECTION CONDITION 
  • ID number data in the instrument cluster and the PCM are different.
POSSIBLE CAUSE 
  • Necessary procedures were not performed using the M-MDS after replacing the PCM.
  • Instrument cluster malfunction
  • PCM malfunction
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