Diagnostic Aids

WARNING: This page is about a different car, the 2004 Suzuki Swift + and 2004 Chevrolet Aveo. However, it is still accessible from the selected car via links, so may be relevant.

Repair low voltage, driveability, or other electrical complaints first, prior to performing DTC C0056.
Ensure the integrity of the connection between the EBCM and the brake pressure modulator valve (BPMV) is secure, tight, and free of corrosion, leaks, and/or damage.
Possible cause for DTC C0056 to set is an internal relay problem within the EBCM.

DTC C0056

Step	Action	Yes	No
1	Did you perform the Diagnostic System Check - ABS?	Go to Step 2	Go to Diagnostic System Check - ABS
2	Install the scan tool. Turn ON the ignition, with the engine OFF. Using the scan tool, observe the DTC information. Does the scan tool display any DTCs set in current or history data other than DTC C0056?	Go to Diagnostic Trouble Code (DTC) List	Go to Step 3
3	Turn the ignition switch OFF. Disconnect the harness from the electronic brake control module (EBCM). Check the connectors for damage, corrosion, and terminal contact. Were any problems found?	Go to Step 4	Go to Step 5
4	Repair as needed. Did you find and correct the condition?	System OK	-
5	Replace the EBCM. Refer to Brake Modulator Assembly Replacement (Delphi) or Brake Modulator Assembly Replacement (Mando) . Did you complete the replacement?	System OK	-