AutoCodes – Toyota – B2798 2018 Toyota RAV4

B2798 2018 Toyota RAV4 Code - Communication Malfunction No. 2 Immobilizer System

Quick Answer

The Diagnostic Trouble Code (DTC) B2798 is stored when a key is inserted into the ignition key cylinder, but a communication error occurs between the key and Transponder Key ECU Assembly. Common causes include Faulty Key, Faulty Transponder Key Coil, Faulty Transponder Key ECU Assembly. 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: B2798 2018 Toyota RAV4 indicates Communication Malfunction No. 2 Immobilizer System.
Common causes: Common causes include Faulty Key, Faulty Transponder Key Coil, Faulty Transponder Key ECU Assembly.
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 304

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 B2798 2018 Toyota RAV4 Description

The Diagnostic Trouble Code (DTC) B2798 is stored when a key is inserted into the ignition key cylinder, but a communication error occurs between the key and Transponder Key ECU Assembly.

OBDII Code B2798 2018 Toyota RAV4 - Communication Malfunction No. 2 Immobilizer System - AutoCodes.com — B2798 2018 Toyota RAV4 Code - Communication Malfunction No. 2 Immobilizer System

What does this mean?

What are the Possible Causes of the DTC B2798 2018 Toyota RAV4?

Faulty Key
Faulty Transponder Key Coil
Faulty Transponder Key ECU Assembly

How to Fix the DTC B2798 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 B2798 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 B2798 2018 Toyota RAV4 code?

Need more information on how to fix the B2798 2018 Toyota RAV4 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2798 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 B2798 2018 Toyota RAV4 Code

1. What are the common symptoms of OBDII code B2798 in a 2018 Toyota RAV4?

The common symptoms of code B2798 include difficulty starting the vehicle, the engine not turning over, and the security light staying illuminated on the dashboard.

2. What does the OBDII code B2798 Communication Malfunction No. 2 Immobilizer System indicate in a 2018 Toyota RAV4?

The B2798 code indicates a communication malfunction within the Immobilizer System of the vehicle, potentially leading to issues with the system's ability to recognize the key and allow the engine to start.

3. What are the possible causes of the B2798 code in a 2018 Toyota RAV4?

Possible causes of code B2798 include a faulty immobilizer system, issues with the key transponder, wiring or connection problems, or a malfunctioning Engine Control Module (ECM).

4. How can I diagnose the B2798 code in my 2018 Toyota RAV4?

Diagnosing the B2798 code usually involves using a professional OBDII scanner to retrieve the code, checking the immobilizer system components for any visible damage, and testing the communication between the different system modules.

5. How can I repair the B2798 code in my 2018 Toyota RAV4?

Repairing the B2798 code may involve repairing or replacing damaged wiring or connections, reprogramming the key transponder, resetting the immobilizer system, or replacing faulty components like the ECM.

6. Can I drive my 2018 Toyota RAV4 with the B2798 code present?

It is not recommended to drive your vehicle with the B2798 code present, as it may lead to potential starting issues or even prevent the engine from starting altogether.

7. Is it possible to reset the B2798 code in a 2018 Toyota RAV4 without professional help?

While some codes can be cleared by disconnecting the battery, the B2798 code may require professional diagnosis and repair to ensure the issue is properly addressed.

8. How much does it typically cost to repair the B2798 code in a 2018 Toyota RAV4?

The cost of repairing the B2798 code can vary depending on the exact cause of the issue and the labor rates in your area. It's best to consult a professional technician for an accurate estimate.

9. Will the B2798 code cause any long-term damage to my 2018 Toyota RAV4 if left unresolved?

Leaving the B2798 code unresolved could potentially lead to more severe starting issues or immobilizer system failures, so it's advisable to address the problem promptly to avoid further complications.

10. Can a DIY enthusiast with basic automotive knowledge fix the B2798 code in a 2018 Toyota RAV4?

While some simple checks like inspecting connections can be done by DIY enthusiasts, diagnosing and repairing the B2798 code may require specialized tools and expertise, making it more suitable for professional technicians.