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Cruise control
The most likley cause is a faulty brake switch. The switch is sending a signal to the PCM that you are braking and turns off the cruise control. It is important that the ratchet adjustment is set correctly when replacing the switch. A less likely cause is a software issue in the PCM that would need a flash programing update for the PCM. This can only be done at a Chrysler Dealership with special equipment.
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