DTC 43 - Last Transmitter Message Received Had Sumcheck Error

Malfunction/Condition

The digital RF message received was from a Remote Control Door Lock Transmitter that is programmed to the BCM, but the message did not pass the sumcheck security test.

Operational Effects

No remote function capability (i.e., Lock, Unlock; etc.).

Potential Causes

The Remote Control Door Lock Transmitter is not in sync with the BCM. This can be caused by the Remote Control Door Lock Transmitter buttons being pressed more than 256 times while out of range of the BCM. It can also be caused by changing the Remote Control Door Lock Transmitter's battery and pushing the transmitter's buttons more than 10 times while out of range of the BCM. This malfunction could also be encountered if the digital RF message has an error due to noise from the surrounding environment or if the Remote Control Door Lock Transmitter itself is defective.

Comments

The most likely cause is the Remote Control Door Lock Transmitter out of sync with the BCM. To re-synchronize the transmitter to the BCM, press "Lock" and "Unlock" buttons on the transmitter at the same time for 5 seconds.