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I have a 1999 Chrysler 300M. On two occasions my car went into limp mode. The first time it happened I was cruising down the highway at 70mph when the speedometer suddenly went to zero. The car continued to run normally until I was forced to slow for traffic. As soon as I slowed down, the car went into limp mode and stayed there. The second time it happened, the car went into limp mode but the speedometer continued to work normally. As least with my car, a faulty speed sensor was the cause of the problem on both occasions. The Chrysler mechanic explained that there are two such speed sensors on or in the transmission. He also said those speed sensors tend to fail more than other things.

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16y ago

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