AutoCodes – Lexus – B2797 Lexus

B2797 Lexus 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 Lexus 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 10,006

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

What does this mean?

What are the Possible Causes of the DTC B2797 Lexus?

Faulty Key
Faulty Transponder Key Coil
Faulty Transponder Key ECU Assembly

How to Fix the DTC B2797 Lexus?

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 Lexus 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 Lexus Code

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

- Possible causes include issues with the key fob, faulty immobilizer system components, wiring problems, or a communication error between modules.

3. How can I diagnose the OBDII code B2797 (Lexus) Communication Malfunction No. 1 Immobilizer System?

- Diagnosis involves checking the key fob battery, inspecting wiring connections, testing the immobilizer system components, and using a diagnostic scanner to read the code.

4. Can resetting the vehicle's computer clear the OBDII code B2797 (Lexus) Communication Malfunction No. 1 Immobilizer System?

- Resetting the vehicle's computer may temporarily clear the code, but it is important to diagnose and address the underlying issue to prevent it from reoccurring.

5. What are some repair tips for fixing OBDII code B2797 (Lexus Communication Malfunction No. 1 Immobilizer System?

- Repair tips may include checking and replacing the key fob battery, inspecting and repairing any damaged wiring, and resetting the immobilizer system if necessary.

6. Is it safe to continue driving with OBDII code B2797 (Lexus) Communication Malfunction No. 1 Immobilizer System?

- It is not recommended to drive the vehicle with this code present, as it can lead to potential starting and immobilization issues that may leave you stranded.

7. Can a DIY enthusiast fix OBDII code B2797 (Lexus) Communication Malfunction No. 1 Immobilizer System?

- While some basic checks like inspecting the key fob and wiring can be done by a DIY enthusiast, diagnosing and repairing complex issues may require professional help.

8. How much does it cost to repair OBDII code B2797 (Lexus) Communication Malfunction No. 1 Immobilizer System?

- Repair costs can vary depending on the root cause of the issue, but they may range from a simple key fob battery replacement to more extensive repairs involving the immobilizer system components.

9. Can a locksmith help with OBDII code B2797 (Lexus Communication Malfunction No. 1 Immobilizer System?

- A locksmith may be able to assist with key fob programming, key reprogramming, or immobilizer system reinitialization to address the communication malfunction.

10. How can I prevent OBDII code B2797 (Lexus) Communication Malfunction No. 1 Immobilizer System from occurring again?

- Regularly checking the key fob battery, ensuring proper key usage, and addressing any wiring issues promptly can help prevent the code from reoccurring.