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 SX TURBOREPAIR AND DIAGNOSIS (SINGLE PAGE)QUICK LOOKUPSDTC INDEX - OPTIMA (EXCEPT HEV)SMART KEY UNIT DTCS
2015 Kia Optima SX Turbo
Smart Key Unit DTCS
2015 Kia Optima SX TurboSECTION 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.