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Evaporative Emission Control System Vent Control Circuit Malfunction
You have to locate the charcoal canister under the car, near the rear. Perhaps the vent or vent valve is plugged, or the electrical connections are dirty. I believe GM is obligated to replace these components for 8 years or 80,000 miles. So inquire at a GM dealer because the canisters are not cheap.
Your car is in no great danger.
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