Fatigued or broken wires to the output speed sensor can cause problems with the cruise control, erratic shifting, and speedometer operation. This may also cause Check Engine Light illumination.Google+
Car Problem Reports
Chrysler 300M Worn Wires to Output Speed Sensor May Cause Problems With Cruise Control/Shifting/Speedometer
Chrysler 300M Problem
Average Mileage: 156,022 mi (100,066 mi - 189,000 mi)
Visitor, 1999 Chrysler 300M, 189,000 mi
I was driving when the car stopped accelerating and then cut off. The RPMS goes up but the speedometer wont move at all.
Had what it seems to be a comon problem with input/output sensors, gears were not shifting on there own had to use autostick until problem was fix. But parts were not costly at all labor will be the exspensive thing.
Visitor, 2000 Chrysler 300M, 179,000 mi
IT NEVER WORKED