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HOMESERVICE MANUALSTOYOTA2009SEQUOIA LIMITED, 5.7 Y, RWDREPAIR AND DIAGNOSISBODY & FRAMEDOOR LOCKSTHEFT DETERRENT & KEYLESS ENTRYENGINE IMMOBILIZER SYSTEMDIAGNOSTIC TROUBLE CODE CHART
2009 Toyota Sequoia Limited, 5.7 Y, RWD

Diagnostic Trouble Code Chart

2009 Toyota Sequoia Limited, 5.7 Y, RWDSECTION Diagnostic Trouble Code Chart

HINT:

If a trouble code is displayed during the DTC check, inspect the trouble areas listed for that code. For details of the code, refer to "Reference" below.

  1. TRANSPONDER KEY ECU DTC CHART 

    Immobilizer 

    DIAGNOSTIC TROUBLE CODE CHART

    DTC Code Detection Item Trouble Area
    B2780  Push Switch / Key Unlock
    Warning Switch Malfunction
    • Transponder ECU
    • Unlock warning switch
    • Harness or connector
    B2784  Antenna Coil Open / Short
    • Transponder ECU
    • Transponder key amplifier
    • Harness or connector
    B2793  Transponder Chip Malfunction Key
    B2794  Unmatched Encryption Code Key
    B2795  Unmatched Key Code Key
    B2796  No Communication in Immobilizer System
    • Transponder ECU
    • Transponder key amplifier
    • Harness or connector
    B2797  Communication Malfunction No. 1
    • Transponder ECU
    • Transponder key amplifier
    • Harness or connector
    • Key
    B2798  Communication Malfunction No. 2 Key
  2. ECM DTC CHART 

    HINT:

    The DTCs for the engine immobilizer system are specified above. If other codes are output, check the DTC chart for the SFI system.

    ECM 

    ECM DTC CHART

    DTC Code Detection Item Trouble Area Reference
    B2799  Engine Immobilizer System Malfunction
    • Transponder ECU
    • Harness or connector
    • ECM
    		  
    B279A  Theft Deterrent System Communication Line High Fixation
    • Transponder ECU
    • Harness or connector
    • ECM
    		  
    B279C  Theft Deterrent System Presence Detection ECM  
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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.