Corvette 2005-2008

Electronic Control Module



The Electronic Control Module (ECM) 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 ECM's memory, the ECM 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

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 ECM data. This information must be transferred to the new ECM.

  1. Using a scan tool, retrieve the percentage of remaining engine oil. Record the remaining engine oil life.
  3. Disconnect the negative battery cable.
  5. Remove the wheelhouse filler panel.
  7. Disconnect the engine wiring harness electrical connectors as shown (1) from the ECM.
  9. Remove the ECM bolts (2).
  11. Remove the ECM.
  13. Installation is the reverse of removal.
  15. Program the ECM.

    Click image to see an enlarged view

    Fig. ECM mounting



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