1. Using the Check Engine Light (MIL) and the Onboard Diagnostics (OBD) System:
* For some older models (pre-OBD II): The Check Engine Light might flash a specific code sequence. This is very infrequent and the codes are rarely standardized. You'd need a repair manual specific to your Suburban's year and model to decipher this flashing pattern. This method is unreliable and rarely used anymore.
* For most models (OBD II and later – generally 1996 and up): This is the standard method. You'll need an OBD-II scanner. These come in various forms:
* OBD-II Code Reader: This is the simplest and cheapest option. It plugs into the OBD-II port (usually located under the dashboard) and displays the trouble codes. These readers usually only show the code numbers.
* Advanced Scanners: These offer more than just trouble codes. They can provide live data, allow you to clear codes, and often offer descriptions of the codes. Some can even perform more in-depth diagnostics and programming.
* Smartphone Apps and Bluetooth Adapters: Many apps (like Torque Pro) work with inexpensive Bluetooth OBD-II adapters. This allows you to read and often clear codes using your smartphone.
Steps using an OBD-II Scanner (most common method):
1. Locate the OBD-II port: It's usually a 16-pin connector under the dashboard, often near the steering column.
2. Connect the scanner: Plug the scanner into the OBD-II port.
3. Turn the ignition on: Turn the key to the "ON" position (without starting the engine).
4. Read the codes: The scanner will retrieve and display the Diagnostic Trouble Codes (DTCs).
5. Interpret the codes: You can usually find a description of the codes online (many websites and even apps provide code lookup). Keep the year, make, and model of your Suburban handy for accurate interpretations.
2. Using a Dealer or Repair Shop:
Professional mechanics have advanced diagnostic equipment that can read and interpret codes, along with the expertise to diagnose and fix the underlying problem. This is the most reliable but also the most expensive option.
Important Considerations:
* Year of your Suburban: Knowing the year is crucial, as the diagnostic methods and available codes can vary significantly between model years.
* OBD-II Compliance: Almost all Suburbans from 1996 onward are OBD-II compliant. Older models may require different diagnostic methods.
* Code Definitions: Never rely solely on a single code definition. Consider the symptoms you're experiencing with the codes to get a better understanding of the potential issues.
After getting the codes, researching them online, and considering the vehicle's symptoms, you'll have a better understanding of what might be wrong. If you're not comfortable working on your vehicle yourself, it's best to consult a qualified mechanic.
