GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 HUMMER 🢒 2008 🢒 H2 🢒 Brakes 🢒 Antilock Brake System 🢒 DTC C0110

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 Descriptors

DTC C0110 00: Pump Motor Circuit Malfunction

DTC C0110 59: Pump Motor Circuit Component Protection Time Out

Circuit/System Description

The ABS pump motor recharges the brake fluid accumulator during antilock braking and normal power brake assist. The ABS pump motor is part of the hydraulic brake booster assembly.

Conditions for Running the DTC

Ignition voltage is greater than 9.5 volts.

Conditions for Setting the DTC
    • The ABS pump runs continuously for 178 seconds.
    • The EBCM detects an open in the pump motor circuit when the pump motor is activated.

Action Taken When the DTC Sets
    • EBCM disables the Antilock Brake System (ABS)/Traction Control System (TCS)/Vehicle Stability Enhancement System (VSES) for the duration of the ignition cycle.
    • A DIC message and/or a warning message may be displayed.
    • ABS pump motor runs intermittently, 2 seconds on and 8 seconds off.

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

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 Verification

With the scan tool, access the ABS special functions menu and perform the ABS Motor test. The pump motor should function and no DTCs should be set.

Circuit/System Testing
  1. With the ignition OFF, disconnect the main EBCM harness connector (X2) an the small 4-way EBCM harness connector (X1). At both EBCM harness connectors, test for 12 volts on the battery positive voltage circuits.
    2. ⇒If the voltage is below 10 volts, repair open or short to ground on the battery positive voltage circuit.
  2. Connect one end of a test lamp to battery positive voltage. At the EBCM connector, touch the other end of the test lamp to each of the three ground circuits. The test lamp should illuminate.
    3. ⇒If the test lamp does not illuminate when touched to each ground circuit, repair open in the suspected ground circuit.
  3. Remove the two small rubber caps that cover the ABS pump motor connections to the EBCM. Connect a test lamp between the two terminals located under the rubber plugs. Turn the ignition ON. Use the scan tool to command the ABS pump motor ON.
    4. ⇒If the test lamp illuminates, replace the hydraulic brake booster.
    ⇒If the test lamp does not illuminate, replace the EBCM / BPMV assembly.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM and BPMV replacement, setup, and programming