AutoCodes – Scion – B2798 Scion

B2798 Scion 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 Scion 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 4,114

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 Scion 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 Scion - Communication Malfunction No. 2 Immobilizer System - AutoCodes.com — B2798 Scion Code - Communication Malfunction No. 2 Immobilizer System

What does this mean?

What are the Possible Causes of the DTC B2798 Scion?

Faulty Key
Faulty Transponder Key Coil
Faulty Transponder Key ECU Assembly

How to Fix the DTC B2798 Scion?

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 Scion 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.

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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 Scion Code

1. What are the common symptoms of OBDII code B2798 in a Scion related to the Communication Malfunction No. 2 Immobilizer System?

- Common symptoms include difficulty starting the vehicle, engine stalling, and the immobilizer system malfunctioning.

2. What are the possible causes of the B2798 code in a Scion?

- The code can be triggered by issues such as a faulty immobilizer system, damaged wiring, a defective transponder key, or a malfunctioning engine control module.

3. How can I diagnose the Communication Malfunction No. 2 Immobilizer System in my Scion?

- Diagnosis typically involves using an OBDII scanner to retrieve the specific code, inspecting the immobilizer system components, checking the wiring for damage, and testing the transponder key.

4. Can I still drive my Scion with the B2798 code present?

- It is not recommended to drive your Scion with the B2798 code active, as it may lead to starting issues or potential stalling while driving.

5. Is it possible to repair the B2798 code in a Scion at home?

- While some basic checks like inspecting wiring connections can be done at home, diagnosing and repairing the Communication Malfunction No. 2 Immobilizer System issue may require professional assistance.

6. How much does it typically cost to repair the B2798 code in a Scion?

- The cost of repairing the B2798 code can vary depending on the underlying cause. It is advisable to consult a mechanic for a proper diagnosis and cost estimate.

7. Can resetting the OBDII system clear the B2798 code from my Scion?

- Simply resetting the OBDII system may not resolve the B2798 code permanently, as it is usually an indicator of an ongoing issue with the immobilizer system that needs to be addressed.

8. Are there any preventive measures to avoid triggering the B2798 code in a Scion?

- Ensuring regular maintenance of the immobilizer system, using genuine transponder keys, and promptly addressing any starting issues can help prevent the B2798 code from being triggered.

9. How long does it usually take to repair the Communication Malfunction No. 2 Immobilizer System issue in a Scion?

- The repair time for the B2798 code can vary depending on the specific cause and complexity of the issue. It is recommended to consult a professional for an accurate estimate.

10. Will the B2798 code cause my Scion to fail an emissions test?

- The B2798 code itself may not directly cause your Scion to fail an emissions test, but it indicates a problem with the immobilizer system that should be addressed to ensure the vehicle's overall performance and compliance.