Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSKIA2015OPTIMA EXREPAIR AND DIAGNOSIS (SINGLE PAGE)QUICK LOOKUPSDTC INDEX - OPTIMA (EXCEPT HEV)SMART KEY UNIT DTCS
2015 Kia Optima EX
Smart Key Unit DTCS
2015 Kia Optima EXSECTION Smart Key Unit DTCS
SMART KEY UNIT DIAGNOSTIC TROUBLE CODES (DTC) LIST
| DTC | Description |
|---|---|
| DTC B1602 | CAN Error |
| DTC B1603 | CAN Bus Off |
| DTC B1604 | CAN Timeout Between SMK And (IPM Or BCM) |
| DTC B1609 | CAN Timeout Between SMK And SJB |
| DTC B1613 | CAN Timeout Between SMK And CLU |
| DTC B1625 | ECM Communication Data Failure |
| DTC B1987 | Sub Micom Failed |
| DTC B1991 | Immobilizer TX Short Circuit To Ground |
| DTC B2120 | SMK IGN1 Control Output Fault |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.