C0269

DTC C0269 or C0274 and C069 or C074





Circuit Description
The ABS relay supplies battery voltage to six valve solenoids. The EBCM microprocessor applies the grounds needed to activate each solenoid. The low side of each solenoid coil has a feedback circuit to the EBCM microprocessor. When a solenoid is commanded OFF, the feedback voltage is high. When a solenoid is commanded ON, the feedback voltage is low.

Conditions for Running the DTC
^ The ignition is ON.
^ The vehicle is experiencing an ABS event.

Conditions for Setting the DTC
C0269
The EBCM commands a dump solenoid ON for 9 consecutive seconds.

C0274
The EBCM commands an isolation solenoid ON for 255 consecutive seconds.

Action Taken When the DTC Sets
If equipped, the following actions may occur:
^ The EBCM disables the ABS/TCS/VSES and DRP.
^ The ABS indicator turns ON.
^ The traction off indicator turns ON.
^ The red brake warning indicator turns ON.
^ The message center displays the SERVICE STABILITY SYSTEM message.

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
The most likely cause of DTC C0269 or DTC C0274is a mechanical failure that causes a wheel to lock and remain locked. The DTCs may also set, conceivably, when the ABS is activated on surfaces that are nearly impossible to get traction on. If the DTC sets within these conditions, diagnosis of the ABS system is not necessary.

Test Description
The number below refers to the step number on the diagnostic table:
2. Performing solenoid tests determines if there is a mechanical malfunction inside the BPMV. Perform dump valve solenoid tests for DTC C026g or isolation valve solenoid tests for DTC C0274.