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Hi, On all EFI system cars and trucks, there is a computer (ECU) that manages engine. The stored code(s) in ECU can be looked at by using a code reader. Most mechanics have one. The reader can tell you what area of the engine the trouble is. Some cars and truck even have a self diagnostic mode that can be viewed. good luck.
The ECM is located in a slot on the passenger's side of the firewall, under the hood.
Look for the large connector and ground wire. Be sure to disconnect the
negative battery cable, prior to removal or installation of the ECM.
BCM on the 2001 durango was also known as the CTM but regardless it is located on driver side kick panel where your left foot would be if you are driving. there is two screws to remove panel. its a black box with three plug ins.
Which engine light are you referring to? If you are talking about the Check Engine light then it is on because there is a problem with the emissions system. It can be as minor as a loose gas cap or more severe. You need to have the ECU scanned with an OBD2 scan tool. The tool will retrieve the code stored by the ECU. This will tell the technician what part is being effected but not necessarily the defective part. It takes skill and training to determine what the problem is. I suggest you seek out a qualified mechanic with the tools and training and do not just throw parts at the problem.
The ECU would have to be programmed from the dealer. It normally costs somewhere around $100 to have it reprogrammed. The reason it needs reprogrammed is because the factory theft module in your car is different than the theft module in the car that the "new" ECU came from. I had this problem with my 1997 Cadillac Deville.
All you would have to do is get it to a Dodge dealership and have them reprogram the ECU. Make sure you explain that you just replaced the ECU, and you need it reprogrammed to match your SUV.
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