AutoCodes – Generic – B2796

B2796 Code - No Communication In Immobilizer System

Quick Answer

This Diagnostic Trouble Code (DTC) is stored when a key is inserted into the ignition key cylinder, but no communication 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: B2796 indicates No Communication In 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 18,745

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 B2796 Description

This Diagnostic Trouble Code (DTC) is stored when a key is inserted into the ignition key cylinder, but no communication occurs between the key and Transponder Key ECU Assembly.

OBDII Code B2796 - No Communication In Immobilizer System - AutoCodes.com — B2796 Code - No Communication In Immobilizer System

What does this mean?

What are the Possible Causes of the DTC B2796?

Faulty Key
Faulty Transponder Key Coil
Faulty Transponder Key ECU Assembly

How to Fix the DTC B2796?

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 B2796 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 B2796 code?

Need more information on how to fix the B2796 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2796 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B2796 Ford — Solar Radiation Sensor Circuit Open
B2796 Lexus — No Communication In Immobilizer System
B2796 Lincoln — Solar Radiation Sensor Circuit Open
B2796 Mercury — Solar Radiation Sensor Circuit Open
B2796 Scion — No Communication In Immobilizer System
B2796 Toyota — No Communication In 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 B2796 Code

What does the OBDII code B2796 indicate?

The OBDII code B2796 indicates that there is no communication detected in the immobilizer system, which can prevent the vehicle from starting.

What are common symptoms of the B2796 code?

Common symptoms may include the engine not starting, dashboard warning lights related to the immobilizer system, and issues with key recognition.

What can cause the B2796 code to appear?

The B2796 code can be caused by a faulty or damaged immobilizer control unit, issues with the vehicle's keys, wiring problems, or a dead battery in the key fob.

How can I diagnose the B2796 code?

To diagnose the B2796 code, check for any other related codes, inspect the immobilizer system wiring and connections, and test the keys for proper function.

What should I do if my vehicle has the B2796 code?

If your vehicle has the B2796 code, start by checking the key for damage or low battery, inspect the immobilizer wiring, and consider using a diagnostic scan tool to gather more information.

Is it safe to drive a vehicle with the B2796 code?

It is not safe to drive a vehicle with the B2796 code if the engine will not start, as this indicates a malfunction in the immobilizer system that needs to be addressed.

Can I clear the B2796 code myself?

You can clear the B2796 code using an OBDII scanner, but it's important to address the underlying issue to prevent the code from returning.

What repairs might be needed for the B2796 code?

Repairs for the B2796 code may include replacing the immobilizer control unit, reprogramming or replacing the key, fixing wiring issues, or resetting the immobilizer system.

How can I prevent the B2796 code from occurring in the future?

To prevent the B2796 code, ensure that your keys are in good condition, regularly check the immobilizer system for any signs of wear or damage, and maintain your vehicle's electrical systems.