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Home >> Chevrolet >> 2010 >> Aveo LT, 4D Hatchback, Standard >> Repair and Diagnosis >> Brakes >> Antilock Brake System With Traction Control System >> Diagnostic Information and Procedures >> DTC C0121 >> Circuit/System Description

Circuit/System Description

When the antilock brake system (ABS) is active, the valve relay provides voltage to actuate the solenoid valves. The valves do not use this voltage unless the ABS control module provides the ground for each solenoid coil.