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.

Typical causes for DTC C0042:

BPMV pump motor open or high resistance
EBCM malfunction

DTC C0042

Step	Action	Values	Yes	No
1	Did you perform the Diagnostic System Check-ABS?	-	Go to Step 2	Go to Diagnostic System Check - ABS
2	Turn the ignition switch to OFF. Disconnect the EBCM. Remove the EBCM from the BPMV. Inspect the EBCM to BPMV connector for conditions such as damage corrosion, poor terminal contact, or the presence of brake fluid. Were the terminals and connector OK, and the cavity free of brake fluid, damage, and corrosion?	-	Go to Step 4	Go to Step 3
3	If damage and/or corrosion are present, replace the EBCM and/or the BPMV as necessary. Refer to Brake Modulator Assembly Replacement (Delphi) or Brake Modulator Assembly Replacement (Mando) . If the brake fluid is present, replace both the EBCM and the BPMV. Refer to Brake Modulator Assembly Replacement (Delphi) or Brake Modulator Assembly Replacement (Mando) . Did you complete the replacement?	-	System OK	-
4	Connect an ohmmeter to terminal 1 and terminal 2 of the BPMV. Was the pump motor resistance reading less than specified value?	2 Ω	Go to Step 6	Go to Step 5
5	Replace the brake pressure modulator valve. Refer to Brake Modulator Assembly Replacement (Delphi) or Brake Modulator Assembly Replacement (Mando) . Did you complete the replacement?	-	System OK	-
6	Replace the EBCM. Refer to Brake Modulator Assembly Replacement (Delphi) or Brake Modulator Assembly Replacement (Mando) . Did you complete the replacement?	-	System OK	-