Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2010AVEO LT, 4D HATCHBACK, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)BRAKESANTI-LOCK BRAKESANTILOCK BRAKE SYSTEM WITH TRACTION CONTROL SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC C0121CONDITIONS FOR SETTING THE DTC
2010 Chevrolet Aveo LT, 4D Hatchback, Standard
Conditions for Setting the DTC
2010 Chevrolet Aveo LT, 4D Hatchback, StandardSECTION Conditions for Setting the DTC
- The electronic brake control module (EBCM) is requesting valve activation and the relay output voltage is low.
- The EBCM is not requesting valve activation and the relay output voltage is B+.
- The EBCM detects 3 or more solenoid valve circuits are open or shorted during the self-test.
- A malfunction within the EBCM.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.