Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

2006 Hummer H3 AutomaticFACTORY OEM SERVICE PROCEDURE

Installation Procedure

Install the PCM (1) into the PCM mounting bracket, allowing the tabs to fully engage.

Fig 1: Removing/Installing PCM

Courtesy of GENERAL MOTORS CORP.

Connect the body wiring harness PCM connector to the PCM.

Fig 2: Locating PCM & Body Wiring Harness PCM Connector

Courtesy of GENERAL MOTORS CORP.

Engage the CPA retainer.
Connect the engine wiring harness PCM connectors to the PCM.

Fig 3: Locating PCM & Engine Wiring Harness PCM Connectors

Courtesy of GENERAL MOTORS CORP.

Engage the CPA retainer.
If a NEW PCM was installed, the PCM must be programmed. Refer to Control Module References .

Factory Service Tools

Use the Manual With the Right Hardware

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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.

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