what does this check engine code meanp1643

2001 DODGE CARAVAN
220,000 MILES • 3.3L • V6 • 2WD • AUTOMATIC
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KELLY JEAN
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  • 2 POSTS
the check engine is on and the code it gives me is p1643 and want to know what it means
Feb 11, 2016 at 11:06 PM
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SATURNTECH9
  • ✓Experienced Mechanic
  • 30,869 POSTS
Which engine do you have?
Feb 12, 2016 at 11:06 AM
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KELLY JEAN
  • MEMBER
  • 2 POSTS
3.3 v6 automatic
Feb 13, 2016 at 11:42 AM
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STRAILER
  • ✓Experienced Mechanic
  • 55,628 POSTS
DTC P1643 Engine Speed Output Circuit.
Feb 15, 2016 at 1:17 AM
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