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Q: What causes my van to not shift speeds correctly

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My van is not shifting speed and trans axle light is flashing

My car has 151000 miles.
My car has an automatic transmission.

A: The shifting is controlled by the transmiss...

The shifting is controlled by the transmission control module and if the shift light is flashing then the module is detecting a problem in one of the sensors (like a speed sensor which will cause the module to set a code and go into a failure mode and will shift rough). This is so you do not get stranded on the road and can take it to a service facility and get the computer scanned and diagnose the codes stored.

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