AutoCodes – Toyota – B2784 2018 Toyota RAV4

B2784 2018 Toyota RAV4 Code - Antenna Coil Open / Short

Quick Answer

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). Common causes include With Smart Key System, Faulty Engine Switch, Engine Switch harness is open or shorted. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: B2784 2018 Toyota RAV4 indicates Antenna Coil Open / Short.
Common causes: Common causes include With Smart Key System, Faulty Engine Switch, Engine Switch harness is open or shorted.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 453

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jan 16, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2784 2018 Toyota RAV4 Description

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.

OBDII Code B2784 2018 Toyota RAV4 - Antenna Coil Open / Short - AutoCodes.com — B2784 2018 Toyota RAV4 Code - Antenna Coil Open / Short

What does this mean?

What are the Possible Causes of the DTC B2784 2018 Toyota RAV4?

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

How to Fix the DTC B2784 2018 Toyota RAV4?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B2784 2018 Toyota RAV4 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B2784 2018 Toyota RAV4 code?

Need more information on how to fix the B2784 2018 Toyota RAV4 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2784 2018 Toyota RAV4 code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B2784 2018 Toyota RAV4 Code

1. What are the common symptoms of OBDII code B2784 in a 2018 Toyota RAV4?

- Common symptoms include radio reception issues, poor GPS signal, and potential malfunction of keyless entry systems.

2. What does the OBDII code B2784 "Antenna Coil Open / Short" indicate in a 2018 Toyota RAV4?

- This code indicates a malfunction in the antenna coil circuit, either due to an open circuit or a short circuit.

3. What are the possible causes of the OBDII code B2784 in a 2018 Toyota RAV4?

- Possible causes include damaged wiring in the antenna system, a faulty antenna coil, or a problem with the antenna amplifier.

4. How can I diagnose the issue related to OBDII code B2784 in my 2018 Toyota RAV4?

- Diagnosing the issue involves inspecting the antenna system wiring, testing the antenna coil and amplifier, and checking for any loose connections.

5. Can I repair the OBDII code B2784 issue in my 2018 Toyota RAV4 myself?

- Depending on your skill level, you may be able to repair the issue yourself by replacing the faulty antenna coil, repairing damaged wiring, or fixing loose connections.

6. Is it safe to continue driving my 2018 Toyota RAV4 with the OBDII code B2784 present?

- It is generally safe to drive the vehicle with this code, but you may experience issues with radio reception, GPS signal, and keyless entry until the problem is resolved.

7. How much does it typically cost to repair the OBDII code B2784 issue in a 2018 Toyota RAV4?

- The cost of repair can vary depending on the exact cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

8. Can resetting the OBDII code B2784 in my 2018 Toyota RAV4 make the problem go away?

- Resetting the code may temporarily clear the warning light, but it will not fix the underlying issue causing the code to trigger.

9. Will the OBDII code B2784 cause my 2018 Toyota RAV4 to fail an emissions test?

- The code itself may not cause the vehicle to fail an emissions test, but it indicates a problem that should be addressed to ensure proper functioning of the vehicle.

10. How long does it typically take to repair the OBDII code B2784 issue in a 2018 Toyota RAV4?

- The repair time can vary depending on the complexity of the issue and the availability of parts, but it may take a few hours to a day to complete the repair.