I've been looking, not hard at all, for trans temp on my Ram. When I looked into it a while back, I guess Ram doesn't like to share their data without paying fee's and I couldn't find a phone app that did.
It doesn't say it doesn't work...
TFT Transmission Fluid Temperature
Not all vehicles report TFT. In some cases where TFT is not reported, you may be able to implement this gauge through the X-GAUGE programmable gauge system. Check online at
www.ScanGauge.com/support for your specific vehicle.
2003
WORKS ON ALL
Jeep Liberty with the diesel engine does not report fuel use or trip functions and some of the gauges. Unless the recall ECU software update has been completed.