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

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

DTC 45 will set when RKE transmitter has been in program or synchronize mode while out of range of BCM. Fault may also be present if RKE transmitter is defective. Fault could be induced prior to BCM entering diagnostic mode. Most likely cause is that RKE transmitter is out of synchronization with BCM.