Where is the ecu located on a 1999 dodge ram 5.9?

On a 1999 Dodge Ram 1500 with the 5.9L engine, the Powertrain Control Module (PCM), often mistakenly called the ECU (Engine Control Unit), is typically located under the hood, on the driver's side. It's usually mounted on the inner fender well, often near the brake booster. However, the exact position can vary slightly depending on options and trim level. It's a fairly large, black box with numerous connectors.

To be certain, you should:

* Consult your owner's manual: This is the best place to find the exact location for your specific vehicle.

* Look for a large, black box with numerous connectors: This is the most likely candidate.

* Use a wiring diagram: A wiring diagram for your specific truck will show the PCM's location and associated wiring. These can sometimes be found online through various automotive repair databases or forums.

Don't hesitate to check online forums dedicated to Dodge Rams of that year; someone may have already posted pictures of their PCM location.