NOTE: The following areas must be inspected before installing the PCM. Ensure there is no debris in the air filter/PCM housing assembly, or in the MAF/IAT sensor inlet screen that may distort the air flow. Ensure there are no signs of damage to the air filter/PCM housing assembly, or to the intake air duct. If a problem is found, replace the component as necessary.

Install the PCM. Install the PCM connectors. Tighten the PCM connectors screws to specification. See TORQUE SPECIFICATIONS . Install the intake air duct, the MAF/IAT sensor, and the air filter housing cover to the throttle body.
Ensure the intake air duct is installed properly on the throttle body. An improperly installed or distorted damaged air filter, or intake air duct may cause a DTC to set. Align and engage the tabs on the air filter housing cover with the slots in the air filter/PCM housing.
Tighten the air filter housing cover screws to specification. Tighten the intake air duct clamp at the throttle body. Reconnect the MAF/IAT sensor connector. Connect the negative battery cable. Install the rear seat cushion.

Fig 1: Locating Powertrain Control Module (4.0L)

Courtesy of GENERAL MOTORS CORP.

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

Powertrain Control Module: Installation

Use the Manual With the Right Hardware

When to See a Mechanic

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