Looks like a syntax error to me. Try:
wp_list_pages("title_li=&child_of=2143&exclude=$current_post_id")
OR
wp_list_pages("title_li=&child_of=2143&exclude=".$current_post_id)
Also I will suggest to pass parameters as array instead of a string, for better debugging.
wp_list_pages( array(
'child_of' => 2143,
'exclude' => array( $current_post_id ),
);
Make sure $current_post_id is giving proper value.
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