I don't have Text::ParseWords installed on my system now. but tried a re-formulation of your code (untested), yes this last line is trouble!

#!/usr/bin/perl
use warnings;
use strict;
use diagnostics;
use Text::ParseWords;

my $csvfilename = "data.csv";
open( FILE, "<", $csvfilename" )
  or die("Couldn't open CSV file $csvfilename:$!\n");

while ( my $line = <FILE> ) 
{

    my @fields = quotewords( ',', 0, $line ); #no & needed!
      #print will bomb with undef value later if problem
      #or ( warn "problem on line $.:$_" );
      #but maybe you want something like this...
    warn ("less than 6 things on $line") if @fields <6;  

    my ($id,$brand,$dbt,$cdt,$color,$number) = (@fields)[0..5];
    #my ($id,$brand) = (@fields)[0,1]; if all you need is id and brand

    # print "@fields\n";           #prints all fields space separated
    print join("\t",@fields),"\n"; #now with tab sparated

    print "array size = ", scalar(@fields) , "\n";

    print "$id\t$brand\n";
}
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Update:
So the short version would be like:

#!/usr/bin/perl -w
use strict;
use diagnostics;
use Text::ParseWords;

my $csvfilename = "data.csv";
open( FILE, "<", $csvfilename" )
  or die("Couldn't open CSV file $csvfilename:$!\n");

while ( my $line = <FILE> ) 
{
    my @fields = quotewords( ',', 0, $line ); #no & before 
                                              #quotewords() needed!
    
    my ($id,$brand,) = (@fields)[0,1];

    print "$id\t$brand\n";
}
[download]