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.

2007 Hummer H3 AutomaticFACTORY OEM SERVICE PROCEDURE

Installation Procedure

Fig 1: Removing/Installing PCM

Courtesy of GENERAL MOTORS CORP.

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

Fig 2: Locating PCM & Body Wiring Harness PCM Connector

Courtesy of GENERAL MOTORS CORP.

Connect the body wiring harness PCM connector to the PCM.
Engage the CPA retainer.

Fig 3: Locating PCM & Engine Wiring Harness PCM Connectors

Courtesy of GENERAL MOTORS CORP.

Connect the engine wiring harness PCM connectors to the PCM.
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

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready Tools Compare Repair Quote Quote Shield Pro

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.