Out of RF Range

You need to try and tether the remote to the TIU with a four wire phone cord. See if that fixes it and then we'll know.

 I think we need to rally Barry on a quick list of troubleshooting fixes. or 

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This and a whole lot more is all in MTH’s “The DCS O Gauge Companion 2nd Edition", available for purchase as an eBook or a printed book at MTH's web store!

  Borrowed from Barry's post. I may get in trouble for this one.....

If tethering the TIU and the remote doesn't improve things, remove the TMCC engine from the layout and see if things improve.

Second, what is different or what's changed on the layout since the last time everything worked as it should?

Hey Barry- I hadn't changed anything on the layout. I tethered the TIU and the remote and was able to run the engines just fine. I'm going to try again without them tethered and see what happens. 

It sounds as if the transceiver board in the TIU or the remote or both may have lifted out of its socket. If so, you'll need to open the devices and press down carefully on the transceiver board to reseat it.  I suggest the TIU first since it's easier to get into. If reseating the board in the TIU doesn't do it, you'll have to open the remote.

When you open these devices, be vary careful not to pull up on the antenna wire or the transceiver board itself. Doing so can cause damage that's very difficult to repair.

The DCS O Gauge Companion 2nd Edition, pages 155-157  has a detailed discussion regarding this issue and it's resolution.

This and a whole lot more is all in MTH’s “The DCS O Gauge Companion 2nd Edition", available for purchase as an eBook or a printed book at MTH's web store!

Thanks Barry. Without the TIU and remote tethered, I had the same problem. I'll check the transceiver board next. Thanks.