Thanks Drover, Farwest and SouthernComfort. I'll check out the link and see how it goes. From reading another forum the TCM fixed everyones issues.
https://www.jeepgarage.org/threads/t....217787/page-2
EDIT: You sure this is the right place? They only seem to service on particular model. And yes their search tool doesn't work.
http://allgrandcherokee.com.au/about-us/
"We provide new, used and reconditioned parts to suit all 2011- WK Grand Cherokee vehicles to get your vehicle repaired and back on the road and you on your next adventure....and because we specialize in only one model of vehicle we can ensure your vehicle receives the best attention it can."