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
Courtesy of MAZDA MOTORS CORP.