What is the ecm on 5.3 vortec engine?

The 5.3L Vortec engine doesn't have a single, universally named "ECM." The term used varies by year and even sometimes by specific vehicle application. You'll commonly see it referred to as one of the following:

* PCM (Powertrain Control Module): This is the most common and generally preferred term for the main computer controlling the engine and transmission.

* ECM (Engine Control Module): While sometimes used, this term is less precise, as the module often controls more than just the engine.

To find the correct name and location in *your* vehicle, you need to:

1. Find your vehicle's year, make, and model. This is crucial because the location and even the exact module name can vary.

2. Consult your owner's manual: The owner's manual should have a diagram showing the location of the PCM/ECM.

3. Use a repair manual specific to your vehicle's year and model: A repair manual (like those from Haynes, Chilton, or a factory service manual) will give you detailed information, including diagrams and potentially even part numbers.

4. Use an online parts database: Websites like AutoZone, Advance Auto Parts, or others allow you to search by vehicle information to find diagrams and parts, including the PCM/ECM.

Without knowing the specific year and model of your vehicle, it's impossible to give you a precise location or proper name for the engine control module.