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 MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 743 (ENGINE IMMOBILIZER SYSTEM - DIAGNOSIS)DIAGNOSTIC TROUBLE CODE CHART
2004 Toyota Matrix XR, FWD, Standard
Diagnostic Trouble Code Chart
2004 Toyota Matrix XR, FWD, StandardSECTION Diagnostic Trouble Code Chart
WARNING: This page is about a different car, the 2004 Lexus ES 330. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC TROUBLE CODE CHART
| DTC | Description |
|---|---|
| DTC B2780 | PUSH SWITCH/KEY UNLOCK WARNING SWITCH MALFUNCTION |
| DTC B2784 | ANTENNA COIL OPEN/SHORT |
| DTC B2793 | TRANSPONDER CHIP MALFUNCTION |
| DTC B2794 | UNMATCHED ENCRYPTION CODE |
| DTC B2795 | UNMATCHED KEY CODE |
| DTC B2796, DTC B2798 | NO COMMUNICATION IN IMMOBILISER SYSTEM |
| DTC B2797 | COMMUNICATION MALFUNCTION NO.1 |
| DTC B2799/99 | ENGINE IMMOBILISER SYSTEM MALFUNCTION |
- TRANSPONDER KEY ECU DIAGNOSTIC TROUBLE CODE CHART
- ECM DIAGNOSTIC TROUBLE CODE CHART NOTE: The DTCs for the Immobilizer system are specified above. If the other codes are output, check the DTC chart for the engine control system.
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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.