To be certain, you should:
* Consult your owner's manual: This is the best resource for the precise location of the PCM in your specific vehicle.
* Look for a large, rectangular electronic module: The PCM is usually a fairly large black box with numerous connectors.
* Search online for a diagram: A quick search for "2002 Dodge Ram van PCM location" with your specific engine size (e.g., "2002 Dodge Ram 1500 PCM location") might yield helpful images.
Caution: Be careful when working near the PCM. Disconnect the battery's negative terminal before working on any electrical components to avoid damage or injury.