Engine Control Module: Removal

WARNING: This page is about a different car, the 2003 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.

ECM is located on right side top of engine. Turn ignition OFF. Remove screw securing Engine Control Module (ECM) ground wire to ECM. See Fig 1 . Flip release levers to open position and disconnect ECM connectors from ECM.
Remove nuts securing ECM to ECM bracket. Remove ECM from ECM bracket.

Fig 1: Removing ECM Ground Wire & Harness Connectors

Courtesy of GENERAL MOTORS CORP.