It is located in the engine bay, above the driver's side frame rail and below the battery.
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YES
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Open your hood and look at the battery, Now look at the bottom left side of the battery and you will see a black plastic box mounted just below the battery. The PCM / Powertran control module is in that box.
with the door handle !!!!
Yes.
YES, Chevrolet did produce a truck in 2004 called a silverado.
The PCM. Power train control module / computer is what controls the transmission.