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.
2021 Kia Forte EXFACTORY OEM SERVICE PROCEDURE
Immobilizer System DTCS
IMMOBILIZER SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC | Description |
|---|---|
| DTC P1677 | Immobilizer-EMS VIN Data Error (EMS has different VIN) |
| DTC P1678 | Immobilizer-EMS No Request (EMS data line open, no immo.) |
| DTC P1688 | Immobilizer Lock |
| DTC P1691 | Immobilizer-Antenna Coil Error |
| DTC P1693 | Transponder No Response Error_Invalid Response |
| DTC P1698 | Immobilizer-Invalid TP (TP has different PIN) |
Factory Service Tools
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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.
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