DTC 45: Receiver Processing Currently In 20-Second Lock-Out: Description

At least 50 consecutive digital RF messages were received from a Remote Keyless Entry (RKE) system transmitter that is programmed to Body Control Module (BCM), but message did not pass encryption security test. BCM will cease processing any RKE system transmitter digital RF messages (good or bad) for 20 seconds. No remote function capabilities will exist.

DTC 45 will set when RKE system transmitter has been in program or re-synchronize mode while out of range of BCM. Fault may also be present if transmitter is defective.

Most likely cause is that RKE system transmitter is out of synchronization with BCM. To re-synchronize transmitter, press LOCK and UNLOCK buttons on transmitter simultaneously for 5 seconds.