GM Service Manual Online
For 1990-2009 cars only

Circuit Description

The instrument panel cluster (IPC) supplies 12 volts to the supplemental brake assist (SBA) module via the SBA signal circuit. The SBA toggles this voltage to ground to produce a valid SBA signal.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC C0136 Base Brake System Pressure Circuit

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

    • The IPC does not receive a valid health signal from the SBA for 5 consecutive ignition cycles.
    • The SBA is producing a SBA signal indicating a system failure.

Action Taken When the DTC Sets

The service brake booster message is displayed.

Conditions for Clearing the DTC

The scan tool is used to clear the DTC.

Step

Action

Yes

No

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Reduced Brake Power Message Displayed

Go to Diagnostic System Check - Vehicle