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The ECU is located on the firewall on the passenger side of the vehicle. It is about 14 inches wide, 10 inches high and maybe 3 inches thick. It has three wiring harnesses plugged into it. If you are going to change it, make sure ignition is off. To unplug the harnesses there is a small tab on top of each. Pull the tab back then you can unplug each harness. There are three screws with 8mm heads that hold it on, 2 on the left and one on the right.

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14y ago
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Q: Where is the ecu located on a 1999 dodge ram 5.9?
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