GM Service Manual Online
For 1990-2009 cars only

Circuit Description

The powertrain control module (PCM) and the electronic brake control module (EBCM) communicate on the serial data link whenever the ignition is ON.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC C0240 EBCM Malfunction

Conditions for Running the DTC

    • The ignition is ON.
    • The engine is running at a speed greater than 450 RPM for 5-20 seconds.

Conditions for Setting the DTC

The EBCM receives a serial data message stating that the PCM has lost the ability to reduce engine torque.

Action Taken When the DTC Sets

    • The EBCM disables the vehicle stability enhancement system (VSES).
    • Engine torque reduction is disabled.
    • The traction off indicator turns ON.
    • The message center displays the service stability system or stability system disabled message.

Conditions for Clearing the DTC

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

Diagnostic Aids

A requested torque signal malfunction is only one possible cause for setting this DTC. DTC C0240 may set due to engine overheating, throttle actuator control failure, loss of ignition timing control by the PCM, etc. If DTC P0856 has not set, refer to Diagnostic System Check - Vehicle in order to identify other possible causes of DTC C0240.

Step

Action

Values

Yes

No

1

Did you perform the Diagnostic System Check - Vehicle?

--

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

Is DTC P0856 set?

--

Go to Symptoms - Engine Controls for the 4.2L engine

Go to Diagnostic Aids