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DTC U0214 [Advanced Keyless 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.
DTC U0214 POSSIBLE CAUSE TABLE

DTC U0214 Keyless receiver.
DETECTION CONDITION 
  • When the keyless receiver power supply voltage is less than 7.5 V. 
POSSIBLE CAUSE 
  • Keyless receiver malfunction
  • Open or short circuit in wiring harness between keyless control module and keyless receiver
  • Keyless control module malfunction
G04323306Courtesy of MAZDA MOTORS CORP.