AutoCodes – Generic – B2793

B2793 Code - Transponder Chip Malfunction

Quick Answer

This Diagnostic Trouble Code (DTC) is output when trouble is found in a key during the key code registration, or the key code is not registered normally. 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: B2793 indicates Transponder Chip Malfunction.
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 2,963

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 B2793 Description

This Diagnostic Trouble Code (DTC) is output when trouble is found in a key during the key code registration, or the key code is not registered normally. Replace the key when the key code registration is not performed normally, and this DTC is detected.

OBDII Code B2793 - Transponder Chip Malfunction - AutoCodes.com — B2793 Code - Transponder Chip Malfunction

What does this mean?

What are the Possible Causes of the DTC B2793?

Faulty Key
Faulty Transponder Key Coil
Faulty Transponder Key ECU Assembly

How to Fix the DTC B2793?

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 B2793 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 B2793 code?

Need more information on how to fix the B2793 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2793 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B2793 Lexus — Transponder Chip Malfunction
B2793 Scion — Transponder Chip Malfunction
B2793 Toyota — Transponder Chip Malfunction

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 B2793 Code

1. What are the common symptoms of OBDII code B2793 (Transponder Chip Malfunction)?

The common symptoms include the inability to start the vehicle, intermittent starting issues, and the immobilizer system light staying illuminated.

2. What causes the OBDII code B2793 (Transponder Chip Malfunction)?

This code is typically caused by a malfunctioning transponder chip in the vehicle's key, a faulty immobilizer system, or issues with the key fob.

3. How can I diagnose the OBDII code B2793 (Transponder Chip Malfunction)?

Diagnosing this code usually involves checking the transponder chip in the key, testing the immobilizer system, and verifying the signal between the key and the vehicle's computer.

4. Can I still drive my vehicle with the OBDII code B2793 (Transponder Chip Malfunction)?

It is not recommended to drive the vehicle with this code as it may result in starting issues or complete immobilization of the vehicle.

5. How can I repair the OBDII code B2793 (Transponder Chip Malfunction)?

Repair options include reprogramming the transponder chip, replacing the key fob, repairing the immobilizer system, or consulting a professional automotive locksmith.

6. Is it possible to reset the OBDII code B2793 (Transponder Chip Malfunction) without repairs?

Resetting the code without addressing the underlying issue may temporarily clear the code, but the problem will likely reoccur until the root cause is fixed.

7. Can a DIY enthusiast fix the OBDII code B2793 (Transponder Chip Malfunction)?

While some simple checks like battery replacement in the key fob can be done by a DIY enthusiast, resolving complex issues with the transponder chip or immobilizer system may require professional help.

8. How much does it cost to repair the OBDII code B2793 (Transponder Chip Malfunction)?

The cost of repair can vary depending on the extent of the issue and the specific components that need to be fixed or replaced. It's advisable to get quotes from automotive professionals.

9. Are there any preventive measures to avoid OBDII code B2793 (Transponder Chip Malfunction)?

Regularly checking the condition of the key fob battery, ensuring proper handling of the key, and promptly addressing any starting issues can help prevent this code from occurring.

10. Can a local auto parts store read the OBDII code B2793 (Transponder Chip Malfunction)?

Most local auto parts stores offer free OBDII code reading services, which can help identify the issue. However, diagnosing and repairing the underlying cause may require the expertise of a professional mechanic or locksmith.