GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2008 🢒 STS 🢒 DTC 🢒 DTC C0136

Diagnostic Instructions
    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    •  Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC C0136 00: Base Brake System Pressure Circuit

DTC C0136 08: Base Brake System Pressure Circuit Signal Invalid

Circuit/System Description

The electronic brake control module (EBCM) uses the input from the brake fluid pressure sensor to enhance antilock brake system (ABS) braking and vehicle stability, if equipped.

Conditions for Running the DTC

The ignition is ON for 1 second.

Conditions for Setting the DTC

C0136 00

One of the following conditions exists for 0.1 second.

    • The brake fluid pressure sensor signal is greater than 4.9 volts.
    • The brake fluid pressure sensor signal is less than 0.15 volt.

C0136 08

The EBCM performs a diagnostic test on the base brake system pressure circuit and sensor when the ignition is turned ON. If the diagnostic determines a faulty sensor or wiring, the DTC will set.

Action Taken When the DTC Sets
    • The EBCM disables the vehicle stability enhancement system (VSES) for the duration of the ignition cycle.
    • The traction control system (TCS) is degraded.
    • A DIC message and/or a warning message may be displayed.

Conditions for Clearing the DTC
    • The condition for the DTC is no longer present.
    • The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Diagnostic Aids

The brake pressure sensor 5 volt reference circuit and low reference circuit is shared with other components in the vehicle stability system. DTCs can set for other components that share circuits with the brake pressure sensor.

Reference Information

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

Control Module References for Scan Tool Information

Circuit/System Testing
  1. Ignition OFF, disconnect the harness connector at the brake fluid pressure sensor.
  2. Test for less than 2.0 ohms of resistance between the low reference circuit terminal 1 and ground.
    3. ⇒If greater than the specified range, test the low reference circuit for an open/high resistance.
  3. Ignition ON, test for 4.8-5.2 volts between the 5 volt reference circuit terminal 3 and ground.
    4. ⇒If less than the specified range, test the 5 volt reference circuit for a short to ground or an open/high resistance.
    ⇒If greater than the specified range, test the 5 volt reference circuit for a short to voltage.
  4. Verify the scan tool Brake Pressure Sensor Input, in VSES Data, is between 4.8 - 5.2 volts.
    5. ⇒If less than the specified range, test the signal circuit terminal 2 for a short to ground.
  5. Install a 3A fused jumper wire between the signal circuit terminal 2 and the low reference circuit terminal 1. Verify the scan tool Brake Pressure Sensor Input is less than 0.5 volts.
    6. ⇒ If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance.
  6. If all circuits test normal, test or replace the brake fluid pressure sensor. If DTC resets, replace the EBCM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM replacement, setup, and programming