Engine-Codes - Toyota - B2784 Toyota

B2784 Toyota Code - Antenna Coil Open / Short

- Code Popularity: 47,788 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents
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What are the Possible Causes of the DTC B2784 Toyota?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
    With Smart Key System
  • Faulty Engine Switch
  • Engine Switch harness is open or shorted
  • Engine Switch circuit poor electrical connection
  • Faulty Certification ECU (Smart Key ECU Assembly)
    Without Smart Key System
  • Faulty Transponder Key Coil
  • Transponder Key Coil harness is open or shorted
  • Transponder Key Coil circuit poor electrical connection
  • Faulty Transponder Key ECU Assembly
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How to Fix the DTC B2784 Toyota?

Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

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What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the B2784 Toyota code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

What Does the B2784 Toyota Code Mean?

When an open or short circuit is detected in the Transponder Key Amplifier Coil built into the Engine Switch, the Certification ECU (Smart Key ECU Assembly) stores this Diagnostic Trouble Code (DTC). This DTC is also stored as a past DTC.
For vehicles without Smart Key System, when an open or short circuit is detected in the antenna coil built into the transponder key coil, the transponder key ECU assembly stores this DTC.

B2784 Toyota Code - Antenna Coil Open / Short

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