DES MOINES, Iowa -- Drivers don't have to adjust their car's radio dial, because some Des Moines stations are changing themselves.

A new digital signal is causing a few glitches for some car radios.

The problem started a few weeks ago. Fans of 93.3 FM and 102.5 FM noticed their radio station presets would sometimes refuse to stay on the right station.

Drivers would find that when they push their preset button that is set to 93.3 FM, it stays for a second and then switches back to 102.5 FM by itself.

GM and Chrysler dealers are trying to repair car radios in Des Moines.

It turns out it's not the radio, it's the signal.

Des Moines Radio Group, which owns the two stations, just began broadcasting a digital signal.

In some newer cars, that signal will tell drivers what song is playing and the artist. It's that signal that is confusing some radios.

"There are always quirks and growing pains with new technology, but this is the strangest I've seen," said Joe Farrington, chief engineer of the Des Moines Radio Group.

The radio station said it is aware of the problem and will replace some equipment will have it fixed in a month or so.