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I bought a 2001 Chrysler 300M Friday and everything was fine. It ran great, I drove it about 3-4 hours Friday, then Saturday the check engine light came on and after a 30 min trip, it cut off pulling out of a parking lot. It runs rough and cuts off. The first time I checked the codes they were:

P0740
P0122
P0700
P1496
P0405

Cleared the codes and only P0122 and P0405 showed up. I am not a mechanic but a friend of mine used to be a mechanic at a Chevrolet dealership and because I have no money after just buying this car, we're trying to figure it out together. We replaced the Throttle Position Sensor, all of the codes, except P0122 and P0405 went away, but it cut off again. We cranked it back up, wiggled the wires going to the TPS and it immediately cut off. We replaced the plug and wires, and it cut off again. OBD website said it could be aligned wrong, but there is no way, that we can tell, to adjust it. It is now showing the following codes:

P0740
P0122
P0700
P1496
P0405
New one: P0106

I cannot afford to take it anywhere and because the car was sold as is, they are not responsible and won't fix it. If you have had a problem like this and could steer me in the right direction or could tell me where to go from here, I would greatly appreciate it. My thoughts are maybe the crankshaft position sensor? OBD said pedal position sensor, but according to Advance Auto's and Napa's websites, my car doesn't have one. I don't think I looked it up wrong, but I don't know. Any help would be greatly appreciated!
 

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A common thread among those diagnostic codes is a low voltage condition. I would first check battery and alternator and make sure they are functioning properly. Do a load test on the battery and check alternator output for proper charging. You could have an intermittent charging condition that sometimes causes low voltage in the electrical system. Is the battery icon lamp turning on? This could be a clue.

If the battery and alternator check to be satisfactory, look at fuse T in the power distribution center (PDC). Check the wiring from this fuse to the electrical system. Look for corroded connections / wire splices. Poor electrical connections will cause voltage drops and mislead you to think a sensor has failed.
 

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Welcome to Allpar. Sorry to hear of the bad luck with your purchase. The 2000 LH Powertrain Diagnostic Procedures book is a great tool to understanding and repairing powertrain fault codes.
First, it would be very unusual that all those components have all failed at the same time. More likely there is a wiring problem causing the fault codes and the trick is to see what they all have in common together.
Use the 'Possible Causes' for each fault code to see what they may all share electrically:

http://oskin.ru/pub/chrysler-dodge/manuals/Service Manuals/2000_LH_LHS_300M_Concorde_Intrepid/LH_Powertrain_Diagnostic_Manual/ELH_PWR.PDF

Component locations, connector pinouts, wire color codes and a simplified schematic are shown in the back of the book.
'Voltage low' fault codes are usually caused by a short-to-ground, usually from a wire being pinched or insulation rub-through to ground in the harness.
These can be intermittent which can make diagnosis and verification difficult.
P1496 may be a key fault code as all the engine sensors run on 5 volts. Look for this wire pinched or rubbed through to ground.
Always diagnose first.
 
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