2012 Chevrolet Colorado Owner's Manual - Page 127

Instruments and Controls The vehicle may not pass inspection if: . 5-15 The malfunction indicator lamp is on with the engine running, or if the light does not come on when the ignition is turned to ON/RUN while the engine is off. See your dealer for assistance in verifying proper operation of the malfunction indicator lamp. The OBD II (On-Board Diagnostics) system determines that critical emission control systems have not been completely diagnosed. The vehicle would be considered not ready for inspection. This can happen if the 12-volt battery has recently been replaced or run down. The diagnostic system is designed to evaluate critical emission control systems during normal driving. This can take several days of routine driving. If this has been done and the vehicle still does not pass the inspection for lack of OBD II system readiness, your dealer can prepare the vehicle for inspection. Brake System Warning Light The vehicle brake system consists of two hydraulic circuits. If one circuit is not working, the remaining circuit can still work to stop the vehicle. For normal braking performance, both circuits need to be working If the warning light comes on, there could be a brake problem. Have the brake system inspected right away. English Metric . This light comes on briefly when the ignition key is turned to ON/RUN. If it does not, have it fixed so it will be ready to warn if there is a problem. When the ignition is on, the brake system warning light comes on when the parking brake is set. See Parking Brake on page 9‑45 for more information. The light stays on if the parking brake does not release fully. If it stays on after the parking brake is fully released, it means there is a brake problem.