AutoCodes – Scion – B2797 Scion

B2797 Scion Code - Communication Malfunction No. 1 Immobilizer System

Quick Answer

This Diagnostic Trouble Code (DTC) is output when a communication error occurs between the key slot and transponder key ECU. 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: B2797 Scion indicates Communication Malfunction No. 1 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 4,204

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 B2797 Scion Description

This Diagnostic Trouble Code (DTC) is output when a communication error occurs between the key slot and transponder key ECU. The DTC B2797 is stored when a key with a BCC malfunction is inserted into the ignition key cylinder.

OBDII Code B2797 Scion - Communication Malfunction No. 1 Immobilizer System - AutoCodes.com — B2797 Scion Code - Communication Malfunction No. 1 Immobilizer System

What does this mean?

What are the Possible Causes of the DTC B2797 Scion?

Faulty Key
Faulty Transponder Key Coil
Faulty Transponder Key ECU Assembly

How to Fix the DTC B2797 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 B2797 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 B2797 Scion Code

1. What are the common symptoms of OBDII code B2797 Scion (Communication Malfunction No. 1 Immobilizer System)?

Common symptoms include difficulty starting the vehicle, engine stalling, and the immobilizer system not recognizing the key.

2. What are the possible causes of OBDII code B2797 Scion?

Potential causes include a faulty immobilizer system, issues with the key or key transponder, wiring problems, or a malfunctioning engine control module (ECM).

3. How can I diagnose the Communication Malfunction No. 1 Immobilizer System issue in my Scion?

Diagnosis typically involves checking the key and key transponder, inspecting wiring connections, and using a scan tool to communicate with the immobilizer system and ECM for error codes.

4. Can I repair the Communication Malfunction No. 1 Immobilizer System issue myself?

While some basic checks like ensuring the key is functioning properly can be done by the owner, diagnosing and repairing complex issues may require the expertise of a professional mechanic.

5. Is it safe to continue driving my Scion with OBDII code B2797 present?

It is not recommended to drive the vehicle with the B2797 code active, as it can lead to starting issues and potential immobilization of the vehicle while driving.

6. How much does it typically cost to repair OBDII code B2797 Scion?

The cost of repair can vary depending on the specific cause of the issue, but it may involve replacing the immobilizer system components, repairing wiring, or reprogramming the ECM, which can range from a few hundred to over a thousand dollars.

7. Can resetting the ECM clear the B2797 code?

Resetting the ECM may temporarily clear the code, but if the underlying issue causing the Communication Malfunction No. 1 Immobilizer System problem is not addressed, the code is likely to reappear.

8. Are there any preventive measures to avoid OBDII code B2797 in my Scion?

Regularly checking the key and key transponder for damage, keeping wiring connections secure, and promptly addressing any starting or immobilizer system issues can help prevent the occurrence of code B2797.

9. How long does it take to repair the Communication Malfunction No. 1 Immobilizer System issue in a Scion?

The repair time can vary depending on the complexity of the problem and the availability of parts. Simple fixes may take a few hours, while more intricate repairs could require leaving the vehicle at the repair shop for a day or more.

10. Will OBDII code B2797 Scion affect my vehicle's performance?

Yes, the B2797 code can impact the vehicle's performance by causing starting issues, engine stalling, and potentially immobilizing the vehicle, making it important to address the problem promptly.