What is the ECU in a Jeep Wrangler?

The ECU in a Jeep Wrangler, like in most modern vehicles, is the Engine Control Unit (also known as the Powertrain Control Module or PCM). It's the "brain" of the engine and drivetrain. It's a computer that receives input from various sensors throughout the engine and vehicle (like oxygen sensors, throttle position sensor, crankshaft position sensor, etc.), processes that information, and then sends signals to control things like fuel injection, ignition timing, and other critical engine functions. The specific name and location might vary slightly depending on the year and model of the Wrangler, but its function remains consistent.