Hello and welcome to just answer Dodge The FCM (Front Control Module) is a small computer that is attached to the under hood fuse box. This computer is responsible for controlling the lights, wipers, horn, and other body related accessories. The dealer has a scan tool (StarScan) that can diagnose the FCM's inputs and outputs. If the dealer diagnosed it as a failed FCM, then it probably is. If for some reason replacing the FCM does not fix your problem then the dealer needs to stand behind their diagnosis and repair and then re diagnose the issue for free. Ask them if they will do this before going ahead with the FCM replacement.
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The FCM is the gateway module and if it is not responding then it will need to be replaced before any further diagnosing can continue. Now the only other thing it could be is that the powers and grounds to the FCM are not present. So ask the dealer if they verified that the battery feed and ground to the FCM. If they did, then the FCM is bad and will need to be replaced and programmed. Now even though the FCM is bad, the dealer's scan tool should still be able to communicate with the PCM and see if it is on line or not, so ask them why they think the PCM may be suspect.
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