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Chrysler Technical Service Bulletin 18-078-16 just done on my 2016 Longhorn.
This SB is mostly for the Rotella oil replacement but also included updated ECM and TCM.
Now warm idle speed is slower than before and I can feel the idle engine shake in the cab, steering wheel, etc.
Was this SB supposed to slow the idle and who can I contact to complain?
George
 

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Welcome to the forum. A good start would be to contact your dealer and explain the circumstances. Please let us know what you find out.
 

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Anyone else who had the update notice a lower idle when warm?
 

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Mine is idling right at 700 rpm when at operating temperature. No ecm update as of yet

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