C0201

DTC C0201

Circuit Description

The system relay, located within the electronic brake control module (EBCM), supplies battery voltage to all of the valve solenoids and to the precharge pump motor. When the relay contacts close, the EBCM monitors the voltage supplied to the valve solenoids and compares this voltage to monitored ignition voltage.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC C0201 Antilock Brake System (ABS) Enable Relay Contact Circuit

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

Either of the following conditions may cause the DTC to set:

^ The EBCM detects that the voltage supplied to the valve solenoids is less than 65 percent of the monitored ignition voltage for 50 milliseconds.
^ The EBCM detects that the relay contacts do not open when the relay is not energized.

Action Taken When the DTC Sets

If equipped, the following actions occur:

^ The EBCM disables the ABS/traction control system (TCS)/vehicle stability enhancement system (VSES)/dynamic rear proportion (DRP).
^ The ABS indicator turns ON.
^ The stability indicator turns ON.
^ The brake warning indicator turns ON.

Conditions for Clearing the DTC

The Conditions for Setting the DTC are no longer present and you use the scan tool Clear DTCs function.

Diagnostic Aids

Refer back to the diagnostic table, steps 3-7, if this DTC continues to set intermittently.

Test Description

The number below refers to the step number on the diagnostic table.
3. A shorted ABS pump motor may damage the contacts within the system relay. It is imperative that the steps in the table be followed to prevent damage to a replacement EBCM.

Step 1 - Step 7: