C0265

C0265 or C0266 and C065 or C066

Circuit Description
The system relay supplies battery voltage to all six valve solenoids. The EBCM applies the ground(s) needed for solenoid activation. The low side of each solenoid coil has a feedback circuit to the EBCM. When the relay is commanded off, feedback voltage is low. When the relay is commanded on and the solenoid is commanded off, feedback voltage is high.

Conditions for Running the DTC
^ The ignition is ON.
^ The vehicle speed is greater than 6 km/h (4 mph).

Conditions for Setting the DTC
C0265
The EBCM detects low feedback voltage from all of the valve solenoids when the relay is commanded on and the solenoids are commanded off.

C0266
The EBCM detects high feedback voltage from all of the valve solenoids when the relay is commanded off.

Action Taken When the DTC Sets
^ The ABS indicator is commanded on.
^ The ABS is disabled for the remainder of the ignition cycle.
^ The EBCM aborts all other self-tests for components that are powered by the system relay (DTC C0265 only).

Conditions:for Clearing the DTC
^ The condition(s) responsible for setting the Diagnostic Trouble Code (DTC) is no longer present.
^ A scan tool is used in order to clear the DTC.

Diagnostic Aids
C0265
An intermittent DTC C0265 may be caused by a problem in the battery positive voltage circuit wiring or connection, to the EBCM. Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. Refer to Testing for Intermittent and Poor Connections, Wiring Repairs and Connector Repairs.

C0266
An intermittent DTC C0266 can be set by several different internal EBCM problems. Replace the EBCM if DTC C0266 continues to set intermittently.

Test Description


The number below refers to the step number on the diagnostic table.
4. This step tests if the battery positive voltage circuit can supply adequate power to the system relay.