2005 Chrysler Sebring Q&A
2005 Chrysler Sebring Question: Why does my speedometer jump when I'm idling?
While idling, either in park or with my foot on the break my speedometer jumps like i'm going between 10-20MPH. I noticed it tends to do it more often when the heat is on. I was told it would be the speed sensors so I had those replaced and its still doing it. The first time it happened I brought it to the shop, the tranny fluid was 2 qts low and it came back with 2 codes, one for the speed sensors, the other for a gear shift sensor or something like that. Now that I've replaced the speed sensors its coming back with no codes. Please help I have no clue what is going on. - jroemen
Was the first code a Vehicle Speed Sensor VSS) that was initially wrong. It is only a pulse generator that puts out an alternating a/c voltage that increases with road speed. They do fail. It could be an instrument cluster problem, but it sounds like a bad ground, another circuit (brake light, heater circuit) is feeding back into the speedometer and making it pulse. You would have to look at a wiring diagram and see where the circuits cross on the power or ground side. - patrick mannion
I believe the problem "IS" the alternator like one genteman stated, because when stopping at a light, my 2004 Sebring would bump and the engine would speed up, and the speedometer would show 10-20 MPH. I watched it closely and when it did it one time the battery warning light (meaning the alternator is not working) came on for about a minute and then went out. I will change the alternator tonight after work. - skymaxbob