Chrysler Repair Questions? Ask a Mechanic for Answers ASAP
What pressure are the tires at now and is the left back still the problem child or has it moved to a new location when you rotated the tires?
This tells me that there is something wrong with the TPMS computer. If the wheel sensor was the problem it would show a different location if the sensor itself was bad. This is going to require the scan tool to locate the actual issue mostly because the scanner can see the live data and any codes that may be stored in the system.
You're missing the point.
From here and even where you are without a scan tool there is nothing you can do. The computer is not receiving the signal from the left rear tire. It's a computer problem.
If it was a tire pressure problem or a wheel sensor problem, it would have moved when you rotated the tire, when I asked you if the low tire moved when you rotated the tires and it didn't, this immediately tells me the sensor on the tire is fine and the problem is with the computer for the TPMS itself.
I am not sure what you would have me do other then try to guide you at this point. Are you wanting to replace the compter yourself or something?
Well, I would say the tire pressure control computer would have to be the failed component. The problem is without proper diagnostics there isn't any way to be 100% sure it's the problem. It doesn't seem to be picking up the signal from the left rear wheel sensor.