The speedometer may become inoperative due to a failed vehicle speed sensor (VSS), . A failed sensor will require replacement.Google+
Car Problem Reports
Plymouth Grand Voyager Speedometer Not Working Due to Failed Vehicle Speed Sensor
Plymouth Grand Voyager Problem
Average Mileage: 195,333 mi (123,000 mi - 264,000 mi)
Visitor, 1998 Plymouth Grand Voyager, 199,000 mi
The entire panel goes dark. Including the overhead. We have tried every sensor. thanks to smart phone, I can put it on dash and keep track of speed. Occasionally the panel comes back on. ?? I guess it is time to let the old girl go..
Visitor, 1998 Plymouth Grand Voyager, 123,000 mi
The speedometer and all the dash gauges stopped working intermittently at first, now they have pretty much stopped working at all. Once in a while they will work for a few minutes.