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 MANUALSTOYOTA2009YARIS S, 4D HATCHBACKREPAIR AND DIAGNOSIS (SINGLE PAGE)GENERAL INFORMATIONDTC INDEXENGINE IMMOBILIZER DTCS
2009 Toyota Yaris S, 4D Hatchback
Engine Immobilizer DTCS
2009 Toyota Yaris S, 4D HatchbackSECTION Engine Immobilizer DTCS
ENGINE IMMOBILIZER DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC | Description |
|---|---|
| B2780 | Push Switch/Key Unlock Warning Switch Malfunction |
| B2784 | Antenna Coil Open/Short |
| B2793 | Transponder Chip Malfunction |
| B2794 | Unmatched Encryption Code |
| B2795 | Unmatched Key Code |
| B2796 | No Communication in Immobilizer System |
| B2797 | Communication Malfunction No. 1 |
| B2798 | Communication Malfunction No. 2 |
| B2799 | Engine Immobilizer System |
RENDER: 1.0x
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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.