ad ra - D rive ▁II ▁and ▁Qu ad ra - T rac ▁II ▁systems . ▁This ▁followed ▁cases ▁of ▁cars ▁rolling ▁away ▁due ▁the ▁transfer ▁case ▁moving ▁into ▁neutral ▁of ▁its ▁own ▁accord , ▁and ▁the ▁owner ▁not ▁having ▁applied ▁the ▁par king ▁bra ke . ▁The ▁recall ▁re vised ▁the ▁Final ▁Drive ▁Control ▁Module ▁( F DC M ) ▁software . ▁However , ▁following ▁the ▁recall ▁there ▁were ▁w ides p read ▁reports ▁on ▁enthus iast ▁web ▁sites ▁ ▁of ▁both ▁the ▁neutral ▁and ▁low ▁ratio ▁modes ▁of ▁the ▁transfer ▁case ▁ce asing ▁to ▁function , ▁and ▁a ▁survey ▁showed ▁that ▁fewer ▁than ▁ 1 0 % ▁of ▁respond ents ▁had ▁experienced ▁no ▁issues ▁with ▁the ▁recall . ▁Att empt ing ▁to ▁resolve ▁these ▁issues , ▁some ▁deal ers ▁subsequently ▁replaced ▁the ▁transfer ▁case ▁actu ator , ▁F DC M , ▁and ▁even ▁the ▁transfer ▁case ▁itself , ▁often ▁at ▁customer ▁exp ense ▁and ▁usually ▁to ▁no ▁avail . ▁ ▁The ▁cause ▁of ▁the ▁roll - aw ays ▁was ▁fault y ▁sol der ing ▁in ▁the ▁transfer ▁case ▁actu ator . ▁It ▁has ▁been ▁dedu ced ▁that ▁the ▁re vised ▁software ▁detect s ▁this ▁by ▁not ing ▁any ▁deviation ▁in ▁resistance , ▁and ▁there up on ▁lo cks ▁the ▁transfer ▁case ▁in ▁high ▁ratio ▁for ▁safety ; ▁but ▁that ▁it ▁is ▁over - react ing ▁to ▁minor ▁resistance ▁variations ▁from ▁other ▁causes . ▁Origin ally ▁Ch rys ler ▁deal ers ▁claimed ▁that ▁the ▁loss ▁of ▁neutral ▁and ▁low ▁ratio ▁following ▁the