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How do I repair cruise control? on 1997 Jeep Grand Cherokee

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
cruise control comes on fine yet it refuses to engage and when it does engage it works for a few seconds and disengages. Check engine light is on and code reads p0121. transmission shifts late or will not shift into overdrive.
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