Possible Causes:
* Battery Voltage Issues: Refueling can sometimes cause a momentary voltage drop, especially if the car's electrical system is already stressed. A weak or failing battery, or a problem with the alternator, could exacerbate this, leading to the anti-theft system engaging as a safety precaution.
* Loose or Corroded Connections: Check the battery terminals and all other electrical connections in the engine bay for corrosion, looseness, or damage. Corrosion can interrupt the signal to the PATS system.
* Faulty PATS Components: The PATS system involves the ignition key, the receiver in the steering column, and the engine control module (ECM). A fault in any of these components could be the culprit.
* Interference: While less likely, some electronic devices or aftermarket accessories could potentially interfere with the PATS system's signals.
* Faulty Ignition Switch: A failing ignition switch could be sending intermittent or incorrect signals, causing the anti-theft system to activate.
Troubleshooting Steps:
1. Check the Battery and Connections:
* Visual Inspection: Inspect the battery terminals for corrosion. Clean them thoroughly with a wire brush and baking soda solution if needed.
* Voltage Test: Use a multimeter to check the battery voltage (should be around 12.6V when fully charged) and the alternator's output voltage while the engine is running (should be around 13.5-14.5V). A low voltage reading could indicate a failing battery or alternator. A local auto parts store can typically perform this test for free.
2. Check for Loose or Damaged Wiring: Carefully examine the wiring harness in the engine bay, paying close attention to connections related to the ignition system and the PATS system. Look for any broken, frayed, or loose wires.
3. Try a Different Key: If you have a spare key, try starting the car with that key. If the problem doesn't occur, the problem likely lies with your primary key's transponder chip.
4. Wait Longer: Try waiting longer than 10 minutes. Sometimes the system needs more time to reset.
5. Professional Diagnosis: If the problem persists, it's best to take your car to a qualified mechanic or an authorized Chevrolet dealer. They have diagnostic tools that can pinpoint the exact cause of the anti-theft system malfunction. They can check the PATS system for faults and replace any necessary components.
Important Note: Do not attempt to bypass or disable the anti-theft system yourself unless you are highly experienced with automotive electronics. Doing so could damage your vehicle's electrical system and/or void your warranty (if applicable).
