Only just seen your post. Code 84 is a generic code normally associated with other diagnostic trouble codes apart from the Code 84.
Where are you located in the world (you didnt complete your sign up).
Which engine petrol/gas, diesel. Auto or manual? (you havent told us)
Code 84 can simply mean it needs servicing; or if associated with other codes (use code reader to find them) you may have DPF problems (if diesel), but can be due to other issues.
Try using the 'Search' tab for other posts.
Typical other discussion on links like :- http://www.chevroletownersclub.co.uk/forum/23-orlando/2574-code-84-a.html
Your current information is too vague to be able to provide any meaningful reply.
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