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I doubt the problem is the torque converter. Three digit codes are brand-model specific.
Code 846 for Chrysler products means the transmission control module has discovered a problem with one of the internal pressure sensors. The problem could be the sensor, the control module, or internal damage to the transmission.
The diagnostic steps for the code would need to be carried out to find the actual problem. You may need a shop manual and special tools to do the testing.
The engine management light comes on to inform you that the engine is
not working correctly and it stores a fault code in the ECU with
information on what is wrong. You can only access this information via
a diagnostic device. If the DME (engine) ECU keeps on
seeing a fault on the engine operation it then goes into limp mode to
protect the engine from damage (low power or stops) when you cycle the
ignition it can reset the ECU and the process starts again (depending
on what the fault is).
I remember something about some codes being in hex or base sixteen so
did a hex to decimal conversion and got 420... Car is not strictly obd compliant as I think 03 onwards for diesel but I think the code is hex so should be p0420. If it is, cat below efficency, check what the lambda after cat is showing in live data.
I advise you to take your car to a
Chrysler main dealership or specialist to have a real time diagnostic
check done so a full diagnose can be given (this will have a set charge
of approx 20 mins labour).
It could be a failed part on the engine system or just a software glitch that will require an ECU programme update.
P0457 is a loose gas cap, P0456 is a small evap system leak. The seal on your gas cap is probably worn. Replace the cap, clear the codes with either a diagnostic tester or by disconnecting the battery for a few minutes and reconnecting it. It will take a few days for the code to come back if it isn't fixed, but that usually does the trick. I hope this helps.