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Security Light 22, DTC B2141/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 22, DTC B2141/P1260 DETECTION CONDITION AND POSSIBLE CAUSES

SECURITY LIGHT: 22  Communication error between the instrument cluster and the PCM (data transfer error)
DTC:  B2141/P1260  
DETECTION CONDITION 
  • Communication error between the instrument cluster and the PCM (data transfer error)
POSSIBLE CAUSE 
  • Malfunction in the wiring harness (CAN line) between the instrument cluster and the PCM
  • Instrument cluster malfunction
  • PCM malfunction