I don’t know if this helps.
Is 'Reduced Engine Power' the same as "Limp Mode"??
I don't know if the '08 GP transmissions have a Transmission Control Module(TCM) or "Input/Output Sensors" also called "Speed Sensors(not the ABS Speed Sensors)".
My '00 Dodge Intrepid had them.
When the input sensor goes bad, the car will only drive in 2nd gear("Limp Mode").
When the output sensor goes, the speedometer will not work.
I tried doing a search for a TCM and I/O Sensors for an ’08 GP.
The only thing that came back were speed sensors for ABS.
