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.
2004 Lexus LS 430FACTORY OEM SERVICE PROCEDURE
Engine Immobilizer W/ Smart Key System DTCS
ENGINE IMMOBILIZER DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC | Description |
|---|---|
| B2780 | PUSH SWITCH/KEY UNLOCK WARNING SWITCH MALFUNCTION |
| B2793 | TRANSPONDER CHIP MALFUNCTION |
| B2794 | UNMATCHED ENCRYPTION CODE |
| B2795 | UNMATCHED KEY CODE |
| B2796, B2798 | NO COMMUNICATION IN IMMOBILIZER SYSTEM |
| B2797 | COMMUNICATION MALFUNCTION NO. 1 |
| B2799 | ENGINE IMMOBILIZER SYSTEM MALFUNCTION |
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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