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In a 2003 Chevy Tahoe, you can locate the ECM, which is a big black plastic component with a cluster of wires, near the battery on the left side of the engine compartment. If you're experiencing issues with the ECM, begin by using an OBD II scan tool to check for any stored codes. If no codes are found, proceed to reset the ECM by disconnecting and connecting the battery wires and waiting for the vehicle's energy to drain.
No, it's situated beneath the hood, right under the battery.
The electronic control module (ECM) in a 2003 Chevrolet Tahoe can be found beneath the glove compartment on the right side of the SUV.