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You can go to Advance Auto, Auto Zone, or other auto parts stores and they will hook up their OBD diagnostic tool to your car and it will read the codes that are causing you your problem. Then they can tell you what the code means, or at least a general idea of where the problem is. For instance, I had a check engine light on, I took it to Advance Auto, they identified the code and told me it was related to the ignition or a spark problem. He told me in his experience to check the spark plugs and spark plug wires first. It was a cracked spark plug boot that gave me an ignition problem whenever it rained or was damp/humid out. You can also google the actual code once you know it, the auto parts stores will give you a printout after they run the OBD scan tool on your car.
the computer in your dodge truck has picked up 1 or more trouble codes in the system, you will have to hook up a code testing retrieving tool to the aldl [ assembly line diagnostic link ] , normally located under the instrument panel on the left side in your truck close to the steering wheel, and retreive the codes and verify them by the booklet that came with the tester, if you don't have a tester, then go to your closest auto part store and explain to them about your engine light being on, they will hook the tester up for free, and tell you what the computer has picked up, good luck, and hope that this information was helpful to you.
Need to check for codes. Need a scanner hooked up and test drive to be able to see what happening. Hopefully someone did not add the wrong fluid because this could contaminate and destroy all rubber parts in the brake system and cause swelling issues.