Fig 1: Identifying Engine Wiring Harness Electrical Connectors & ECM

Courtesy of GENERAL MOTORS COMPANY

Using a scan tool, retrieve the percentage of remaining engine oil and automatic transmission fluid life. Record the remaining engine oil and automatic transmission fluid life.
Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection (With Side Post) , Battery Negative Cable Disconnection and Connection (With Top Post) .

CAUTION:

In order to prevent any possible electrostatic discharge damage to the ECM, do not touch the connector pins.

Unlock and disconnect the engine wiring harness electrical connectors (1) from the ECM (2).

Fig 2: View Of Tabs, Retainers & ECM

Courtesy of GENERAL MOTORS COMPANY

Use the tabs (3) in order to disengage the retainers (2) on the ECM bracket from the ECM (1) and remove the ECM.

Fig 3: Identifying Locking Tabs

Courtesy of GENERAL MOTORS COMPANY

If replacing the ECM bracket perform the following steps, otherwise proceed to step 4 in the installation procedure.
Using a small flat-bladed tool, depress the locking tabs (1) on the ECM bracket.

Fig 4: View Of ECM Bracket

Courtesy of GENERAL MOTORS COMPANY

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Removal Procedure