![]() A fault code is stored in the Engine Control Unit ( ECU).Ĭhevy check engine light should only be on for a few seconds when you turn on the ignition and should turn off once the engine fully starts. A fault code is stored in the Engine Control U engine light stays on, it means that the On-Board Diagnostic (OBD) system has detected a problem with the engine, emission system, or transmission. ![]() ![]() When your Chevrolet check engine light stays on, it means that the On-Board Diagnostic (OBD) system has detected a problem with the engine, emission system, or transmission. What does the Check Engine light mean on Engine light mean on a Chevy?
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