Silverado 2008

Powertrain Control Module (PCM)

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Location



Specific to:

Chevrolet Silverado 1500 2008

The Powertrain Control Module (PCM) is located on a bracket on the side of the engine compartment.

Operation



Specific to:

Chevrolet Silverado 1500 2008

The Powertrain Control Module (PCM) performs many functions on your vehicle. The module accepts information from various sensors and computes the required fuel flow rate necessary to maintain the correct amount of air/fuel ratio throughout the entire engine operational range and controls the shifting of the transmission.

Based on the information that is received and programmed into the PCM's memory, the PCM generates output signals to control relays, actuators and solenoids. The module automatically senses and compensates for any changes in altitude when driving your vehicle.

Removal & Installation



Specific to:

Chevrolet Silverado 1500 2008


NOTE
It is necessary to record the remaining engine oil life. If the replacement module is not programmed with the remaining engine oil life, the engine oil life will default to 100 percent. If the replacement module is not programmed with the remaining engine oil life, the engine oil must be changed at 3,000 miles (5,000km) from the last oil change. A scan tool must be used to retrieve the PCM data. This information must be transferred to the new PCM.

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Disengage the harness connections from the PCM.
  6.  
  7. Disengage the retainer tabs securing the PCM to the bracket. Remove the PCM from the engine compartment.

    Click image to see an enlarged view

    Fig. PCM and related components-4.3L, 4.8L, 5.3L, 6.0L engines

  8.  

To install:


NOTE
Be sure to use new fasteners, as required.

  1. Position the PCM on its mounting.
  2.  
  3. Continue the installation in the reverse order of the removal procedure.
    NOTE
    If a new PCM was installed using the GM diagnostic scan tool, or equivalent, refer to the on-screen reprogramming directions and reprogram the PCM.

  4.  

Testing



Specific to:

Chevrolet Silverado 1500 2008

Service of the Powertrain Control Module (PCM) should consist of either replacement of the PCM or programming of the Electrically Erasable Programmable Read Only Memory (EEPROM). If the diagnostic procedures call for the PCM to be replaced, the replacement PCM should be checked to ensure that the correct part is being used. If the correct part is being used, remove the faulty PCM and install the new service PCM

 
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