2000 Dodge Durango Engine Light On

Hi griffinb1. There IS a code in the Engine Computer. The code readers the parts stores use don't do everything the expensive equipment does, and sometimes won't read every code. GM products can have a Check Engine light on with no stored codes, but bot Chryslers. When that light is on, there is a code that will lead to the circuit or system with the problem, not necessarily the bad part.

Find a mechanic with a hand-held computer, called a scanner, to read the code(s). You can also read them yourself. To read the diagnostic fault codes, cycle the ignition switch from "off" to "run" to "off" to "run" to "off" to "run" three times within five seconds, then leave it in the "run" position. If the starter ever engages, even for a second, turn the ignition switch off, wait a few seconds, then start the procedure over. Older vehicles flashed the Check Engine light to read the codes, but yours will display in the odometer. Record the code(s) and holler back with the results.

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Then there has to be a code in another computer. Inexpensive code readers only read the codes in the Engine Computer. I've never seen one yet that will access the Body or Transmission Computers. For those, you will have to visit a mechanic with a scanner that can look at all of the computers. Any problem that is detected that could adversely affect tail pipe emissions is supposed to turn on the Check Engine light. When the problem is detected by a different computer, it tells it to the Engine Computer because he is the only one in charge of the Check Engine light.

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