GM Service Manual Online
For 1990-2009 cars only

Circuit Description

The powertrain control module (PCM) sends a state of health message to the EBCM within 5.5 seconds after the modules are powered up. This message is sent via serial data communications.

DTC Descriptors

This diagnostic procedure supports the following DTC:

    • DTC C0290 Class 2 Data Link Malfunction
    • DTC C0292 Lost Communication With Engine Control System

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

The EBCM fails to receive serial data from the PCM.

Action Taken When the DTC Sets

If equipped, the following actions occur:

    • The EBCM disables the TCS.
    • The traction off indicator turns ON.

Conditions for Clearing the DTC

The conditions for setting the DTC are no longer present and you use the scan tool Clear DTCs function.

Step

Action

Yes

No

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Scan Tool Does Not Communicate with Class 2 Device

Go to Diagnostic System Check - Vehicle