The engine light codes, also known as diagnostic trouble codes, on a KIA Optima are designed to provide information about a specific failure or malfunction on the vehicle. These alpha-numeric codes are created by the engine control module and then stored in memory where they can be retrieved at a later date with a scan tool. These codes begin with the letter “P” and are followed by a four digit number sequence. Each code corresponds to a specific problem that can be identified by using a service repair manual. Most factory repair manuals provide a flow chart that technicians can use to diagnose and correct the problem that triggered the code.
Turn the engine off, but rotate the ignition switch to the “ON” position. The dashboard must have power in order for the scan tool to communicate with the ECM.
Find the Optima’s diagnostic data terminal and plug the scan tool into the terminal. On most Optimas, the terminal is underneath the front edge of the dashboard on the driver’s side of the vehicle. In some models, it is under the front edge of the dashboard, but mounted vertically on the right side of pedal area.
Turn on the scan tool, then navigate to the DTCs menu. Command the scan tool to read and display the current DTCs stored in the ECM’s memory.
Write down the codes displayed on the scan tool’s screen, then disconnect the scan tool and turn off the ignition.
Visit your local library and look up the code in the Optima’s service manual. Make copies of the code description and the diagnostic flow chart.
