I have a Chrysler 300m, and the tail lights stay on when i turn the car off. This just started today, and i was wondering, what could the problem be?

Question edited for clarity.
Question moved to model category.

You connect a code scan tool and it tells you the issue. It will likely say a P0*** code that is 'VSS Failed no signal'. VSS = Vehicle Speed Sensor.

https://www.google.com/search?q=2002+chrysler+300m+speedometer+not+working

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Check that the wiring harness that goes to tail lights has a ground wire connected to a good grounding spot - not rusted or loose.

How long car was running without coolant,should check by hand if can turn engine ?

battery weak? if is if you have a charger or jump it off ,then go have battrey checked..may need new one, it's winter time!!!!!!!!!!!

check your fuses inside as well as under the hood, with a tester, as it is blown

Hello, my engine light was on for a VERY LONG time and everytime I got it checked no one could tell me what the problem was because things always checked out fine. The "code" says its a loose gas cap or something, but it wasnt that. My 300M also was having A HARD TIME STARTING UP for about 8 months and leaking coolant for about a month. I finally found a mechanic who knew what he was doing; 1. Leaking Radiator 2. Coolant found in #2 or #3 cylinder. The cause of this was a busted HEAD GASKET. If your 300M has trouble starting and the Engine light stays on have a mechanic check your engine for a busted head gasket and see if all your cylinders are firing correctly. I had to pay $2600 for a new Head Gasket, Radiator and all new hoses plus labor. CRYING!!!!!!!!!!

I have a 2001 300M 130K - very well kept. Stuff happens...

three or four plastic wing nuts in trunk behind light back them off an pull light asm away from body

check the multiplug connectors

You have a short in the wiring somewhere. have you tried to pull the connectors off the tail light assemblies? pull both then connect them 1 at a time to see which side is causing the problem, could be as simple as a bulb that has shorted it self out.

get a starting and charging system diagnostic. I am the owner of a 99 300M and I had a similar problem. It took about 3 months before my car would not start at all. But sometimes, I would get this clicking when turning the key in the ignition. It turned out to be a short in the starter. The starter and the alternator had to be replaced.