The ECM in a 2003 Chevy Tahoe can be found in the engine compartment near the battery on the driver's side of the compartment. This is a large black plastic piece that has a bundle of wires that lead into it. If You are having problems with Your ECM then You will want to use an OBD II scan tool first to see if there are any codes that are stored in it. If there are not any codes then You will want to reset the ECM. To reset it You will need to disconnect the battery wires on it and then attach them together and allow the energy to drain from the vehicle.
Logan Reynolds
November 29, 2020
No, it’s located under hood below battery
Antonia B.
April 9, 2020
The ecm in a 2003 chevy tahoe is located under the glove box area in the passenger side of the vehicle.
The Questions and Answers on this page are the statements and opinions of their respective authors and not VehicleHistory.com. VehicleHistory.com
does not research or authenticate any of the Answers provided.