The check engine light is generally to alert you to some condition that is causing the emission control system to malfunction. This could be as simple as a gas cap that is not sealed properly to a fuel injection problem, i.e. to rich .
If the car runs normally with no noise, then try removing & replacing the gas cap correctly. The light should go out in a few minutes. If it doesn't and the engine runs normally, take the car to a service shop when it is convenient. Pepboys, Kragen and Autozone will check it for free.
If the engine runs rough, then slow down & drive carefully to avoid stressing the engine (i.e. no hard acceleration) and get it to a service shop as soon as possible - do not keep driving it, permanent expensive engine damage may result.
Check the rear lower part of engine -- follow the + battery cable
unhook the neg. cable from your battery and wait 5 minutes
Mine came on on my 2001 Concorde because a rat got to the wires of a sensor, the little bastards did it three times :(
find out what it is.... (preferably with a scanner) fix it... , clear codes with scanner
After repairing the cause, you can reset with a scan tool or by unhooking the battery.
The Concorde could misfire for several reasons. Start by checking for proper fire to the spark plugs. Then check engine compression to see if a cylinder compression is down.
After fixing the cause of the problem. you clear code with a scan tool, or by unhooking the battery.
check the battery and or alternator
The same place you check it.
this issue is usually caused by the output speed sensor. that is a common problem with all Chrysler products. it is located on the transmission
The TCM (trans computer) has detected a problem and set a code. This causes the trans to go into safe mode and not shift. Have it checked for codes.
Refine your question with following info: Is there a check engine light? are any fuses blown? Have recent repairs been made?