Method 1: Using the Check Engine Light (and potentially a code reader)
1. Turn the ignition key to the "ON" position (don't start the car). Wait for the check engine light to illuminate, then turn it off. Some vehicles require the key to be cycled several times to initiate the diagnostic procedure.
2. Look for flashing or blinking of the Check Engine Light: A blinking Check Engine Light usually indicates a more serious problem that may require immediate attention.
3. Check Engine Light remains illuminated, but does not blink: A steady light indicates a stored diagnostic trouble code (DTC). This method *usually* doesn't directly show you the code number on the Grand Am's dash itself. You'll need one of the following:
* OBD-II Scanner/Code Reader: This is the most reliable method. OBD-II (On-Board Diagnostics II) is a standardized system used in most vehicles made after 1996. You can purchase a relatively inexpensive OBD-II scanner at most auto parts stores. Plug it into the OBD-II port (usually located under the dashboard) and follow the scanner's instructions to retrieve the codes.
* Advanced On-Board Diagnostics (If your Grand Am has them): Some later model Grand Ams may have a more sophisticated system that allows you to read the code via the instrument panel through a specific sequence of key turns or button presses. Your owner's manual should detail this process if available.
Method 2: Checking the Owner's Manual
Your owner's manual may provide specific instructions for retrieving diagnostic trouble codes for your particular year and model of Grand Am. It's worth a check.
Method 3: Professional Diagnostic
If you're uncomfortable working on your car yourself, or if you can't retrieve the codes using the above methods, take your Grand Am to a trusted mechanic or auto parts store. They have the equipment to diagnose the problem quickly and accurately.
Important Considerations:
* Year of the Grand Am: The diagnostic methods may vary slightly depending on the model year of your Grand Am. Pre-OBD-II vehicles (generally before 1996) will require different methods, often involving test lights and a wiring diagram.
* OBD-II Port Location: Find the OBD-II port, typically under the dashboard on the driver's side.
* Code Lookup: Once you have the codes, you can look them up online using a search engine (e.g., search "P0171 OBD-II code" if you get that code) or use a code lookup tool that comes with your scanner or is available online.
Remember to be safe when working on your vehicle. If you are not comfortable performing these checks, seek professional help.
