It maybe just a coincidence between the recent service on the car and
the door opener not receiving as well. It is possible that something
in the house is causing the door opener to not receive the
transmitters signal as well. You may have a situation where the door
opener receiver is being desensed or overloaded with an unwanted
signal. A baby monitor, cordless phone are some possibilities.

This doesn't have anything to do with a door opener but I once had an
interference problem with my satellite dish on certain channels. I
eventually traced it down to a UPS on my computer. So maybe something
as innocuous as this might be interfering. Start by turning things
off in the house and see where that may lead you.

I installed two openers in my parents garages a number of years ago.
Both worked equally well but then one day my mother was complaining
that the door on her side of the garage wasn't working as well. She
complained that she had to be right in front of the door to open it.
We tried a new battery in the transmitter but that didn't help. What
it turned out to be was my father decided to install brackets on the
garage ceiling to hang his aluminum ladder in order to get it off the
floor of the garage. The ladder was causing the door opener mechanism
to not receive as well. Removing the ladder from the ceiling made the
opener operate as it should. Putting it back and the problem
reappeared. An adjustment on the little wire antenna improved
reception but not like it was without the ladder being near the
opener.

But first try reorienting the little wire antenna on the door opening
mechanism if it has one sticking out the back.

Just a few ideas. Hope this helps.

Bob



"R. P." <r_pol12gar@hotmail.com> wrote in message news:<rtqdnUNosI12LJHdRVn-vw@comcast.com>...
> "Doordoc" <doordoc@prodigy.net> wrote:
> > Is the transmitter one that is built into the visor or roof console or
> > is it a standard garage door opener transmitter that is normally hung
> > on the visor w/ a clip? If it is built-in I would guess that something
> > like a short is drawing off the transmitter power when the car is
> > running. If it is a stand alone transmitter the transmitter battery
> > could be weak (do not use alkaline batteries) or the transmitter could
> > be slightly out of tune and the running engine blocks out the weak
> > signal. There is also the chance that your receiver in the garage is
> > sending out a weaker signal then what it use to.
>
> I have the same old hand held garage door opener I've had before
> this problem started. It is NOT one of those newer, more secure openers
> with the rolling or encrypted code. Replacing the battery seems to make
> no difference. There must be some kind of RF interference emitted from
> the running car that seems to act as a jammer on the garage door
> transmitter and I figure it must have started after one of the regular
> service visits but I did not make the mental connection right away. I
> used to be able to open or close the garage from the street at the end
> of my driweway but now I have to work at it with the car's front almost
> touching the garage door. It's really frustrating.
>
> Rudy