AutoCodes – Toyota – B2797 Toyota

B2797 Toyota 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 Toyota 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 18,907

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

What does this mean?

What are the Possible Causes of the DTC B2797 Toyota?

Faulty Key
Faulty Transponder Key Coil
Faulty Transponder Key ECU Assembly

How to Fix the DTC B2797 Toyota?

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 Toyota 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 B2797 Toyota code?

Need more information on how to fix the B2797 Toyota code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2797 Toyota code diagnosed by a professional: Find a repair shop in your area

Information for Specific Toyota Models

B2797 2013 Toyota RAV4 — Communication Malfunction No. 1 Immobilizer System
B2797 2014 Toyota RAV4 — Communication Malfunction No. 1 Immobilizer System
B2797 2015 Toyota RAV4 — Communication Malfunction No. 1 Immobilizer System
B2797 2016 Toyota RAV4 — Communication Malfunction No. 1 Immobilizer System
B2797 2017 Toyota RAV4 — Communication Malfunction No. 1 Immobilizer System
B2797 2018 Toyota RAV4 — Communication Malfunction No. 1 Immobilizer System

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 Toyota Code

1. What are the common symptoms of OBDII code B2797 in a Toyota related to Communication Malfunction No. 1 Immobilizer System?

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

2. What are the possible causes of OBDII code B2797 in a Toyota?

- The code B2797 can be caused by issues with the immobilizer system, faulty wiring, a defective key transponder, or a malfunctioning engine control module (ECM).

3. How can I diagnose the Communication Malfunction No. 1 Immobilizer System in a Toyota?

- Diagnosis typically involves checking the key transponder, examining the wiring connections, and using a scan tool to retrieve the specific trouble codes stored in the ECM.

4. Can I repair OBDII code B2797 in a Toyota myself?

- While some basic troubleshooting like checking wiring connections can be done by DIY enthusiasts, diagnosing and repairing complex issues may require professional help from a certified mechanic.

5. Are there any tips for troubleshooting OBDII code B2797 in a Toyota?

- Check the key fob battery, ensure the key is properly programmed, and inspect the wiring harness for any visible damage or loose connections.

6. How can I reset the OBDII code B2797 in a Toyota after repairing the issue?

- After addressing the underlying cause of the code, you can typically clear the code using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes.

7. Is it safe to continue driving my Toyota with the B2797 code related to the Immobilizer System malfunction?

- It is not recommended to continue driving the vehicle with this code, as it can lead to potential starting and security issues. It's best to address the problem promptly.

8. Will resetting the code B2797 make the issue go away permanently?

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

9. Can extreme weather conditions affect the occurrence of OBDII code B2797 in a Toyota?

- Yes, extreme temperatures or moisture can sometimes cause electrical issues that trigger the Communication Malfunction No. 1 Immobilizer System code in Toyota vehicles.

10. How long does it usually take to repair OBDII code B2797 related to the Immobilizer System in a Toyota?

- The repair time for this code can vary depending on the specific cause of the malfunction. Simple fixes like reprogramming the key may take less time compared to diagnosing and replacing a faulty ECM.