Diagnostic Aids

Repair low voltage, driveability, or other electrical complaints first, prior to performing DTC C2112.
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 C2112 to set is an internal relay problem within the EBCM.

DTC C2112

Step	Action	Values	Yes	No
1	Did you perform the Diagnostic System Check - Vehicle?	-	Go to Step 2	Go to Diagnostic System Check - Vehicle
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 C2112?	-	Go to Diagnostic Trouble Code (DTC) List - Vehicle	Go to Step 3
3	Turn the ignition switch OFF. Disconnect the harness from the electronic brake control module (EBCM). Check the resistance between terminal 25 of the wiring harness connector and ground. Was the resistance as specified?	0 Ω	Go to Step 5	Go to Step 4
4	Check the fuse Ef4 from the engine room fuse block. Check the connectors for damage, corrosion, and terminal contact, including terminal 25. Repair as needed. Did you find and correct the condition?	-	Go to Step 6	-
5	Replace the EBCM. Refer to Brake Modulator Assembly Replacement . Did you complete the replacement?	-	Go to Step 6	-
6	Use the scan tool in order to clear the DTCs. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text. Does the DTC reset?	-	Go to Step 2	System OK