Removal Procedure

Fig 1: Identifying ECM Engine Wiring Harness Electrical Connector

Courtesy of GENERAL MOTORS CORP.

Using a scan tool, retrieve the percentage of remaining engine oil. Record the remaining engine oil life.
Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection (LAT) or Battery Negative Cable Disconnection and Connection (LZ4, LY7, and LE5) .
Slide the lever locks to the up position in order to release the engine wiring harness electrical connectors.
Disconnect the engine wiring harness electrical connectors (1) from the engine control module (ECM).

Fig 2: View Of ECM

Courtesy of GENERAL MOTORS CORP.

Release the retaining tab located in the battery tray using a small screwdriver or other suitable tool.
Remove the ECM by lifting upward after releasing the tab.