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Engine-Codes – Generic – B1A35

B1A35 Code - Unidentified Key Communication Error

Quick Answer

The B1A35 diagnostic trouble code (DTC) indicates an Unidentified Key Communication Error. Common causes include Faulty key fob battery, Key fob damage or malfunction, Immobilizer system malfunction. 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
B1A35 indicates Unidentified Key Communication Error.
Common causes
Common causes include Faulty key fob battery, Key fob damage or malfunction, Immobilizer system malfunction.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 06, 2024
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Code B1A35 Description

The B1A35 diagnostic trouble code (DTC) indicates an Unidentified Key Communication Error. This code is commonly found in vehicles equipped with keyless entry systems, push-button start systems, or immobilizer systems. When this code is triggered, it means that the vehicle's computer has detected a communication error between the key and the vehicle's immobilizer system. This can prevent the vehicle from starting or can cause intermittent starting issues.

OBDII Code B1A35 - Unidentified Key Communication Error
B1A35 Code - Unidentified Key Communication Error

Common Causes of B1A35

  1. Faulty key fob battery
  2. Key fob damage or malfunction
  3. Immobilizer system malfunction
  4. Wiring or connection issues between the key fob and immobilizer system
  5. Faulty vehicle's computer

Symptoms of B1A35

  1. Intermittent starting issues
  2. Inability to start the vehicle
  3. Key fob not recognized by the vehicle
  4. Security light on the dashboard flashing
  5. Engine cranks but does not start

How to Fix B1A35

  1. Replace key fob battery: Start by replacing the battery in the key fob to ensure it is transmitting a strong signal.
  2. Check key fob functionality: Test the key fob to ensure it is working properly and transmitting the correct signal.
  3. Inspect wiring and connections: Check the wiring and connections between the key fob and the immobilizer system for any damage or loose connections.
  4. Reset the immobilizer system: Reset the immobilizer system according to the vehicle's manufacturer instructions to reestablish communication with the key fob.
  5. Replace faulty components: If the issue persists, consider replacing the key fob, immobilizer system, or vehicle's computer, depending on the root cause of the communication error.

Cost to Fix B1A35

The typical repair costs for addressing an Unidentified Key Communication Error can vary depending on the specific cause of the issue. Replacing a key fob battery can cost around $5 to $20, while a new key fob can range from $50 to $200. If the issue is related to the immobilizer system or the vehicle's computer, the repair costs can increase significantly, potentially ranging from $200 to $1000 or more.

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Code B1A35 Information for Specific Makes

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 B1A35 Code

1. What are the common symptoms of OBDII code B1A35 (Unidentified Key Communication Error)?

- Common symptoms include issues with starting the vehicle, key fob not working properly, and warning lights on the dashboard.

2. What are the possible causes of OBDII code B1A35?

- Possible causes include a faulty key fob, issues with the immobilizer system, wiring problems, or a problem with the vehicle's computer system.

3. How can I diagnose the source of the Unidentified Key Communication Error?

- Diagnosis involves checking the key fob battery, ensuring the key fob is properly programmed, inspecting the wiring connections, and using a diagnostic scanner to read the codes.

4. Can I repair the Unidentified Key Communication Error myself?

- Depending on the cause, you may be able to reset the key fob, replace the key fob battery, or check and repair wiring connections. However, if the issue is more complex, professional help may be required.

5. Is it safe to drive the vehicle with OBDII code B1A35 present?

- It is not recommended to drive the vehicle with this error code present, as it may lead to starting issues or potential immobilization of the vehicle.

6. How much does it typically cost to repair OBDII code B1A35?

- The cost of repair can vary depending on the underlying cause. Simple fixes like replacing a key fob battery may be relatively inexpensive, while more complex issues could lead to higher repair costs.

7. Can a car key replacement fix the Unidentified Key Communication Error?

- In some cases, a car key replacement may resolve the issue if the problem lies with the key itself. However, it is important to diagnose the exact cause of the error before proceeding with a replacement.

8. Will resetting the vehicle's computer system clear the B1A35 error code?

- Resetting the computer system may temporarily clear the error code, but if the underlying issue is not addressed, the code is likely to reappear. Proper diagnosis and repair are recommended.

9. Are there any preventive measures to avoid OBDII code B1A35 in the future?

- Regularly checking the key fob battery, ensuring proper key fob programming, and addressing any wiring issues promptly can help prevent the recurrence of this error code.

10. Can a locksmith help with resolving the Unidentified Key Communication Error?

- A locksmith may be able to assist with key fob programming or replacement, but for diagnosing and repairing complex electronic issues, it is recommended to consult a qualified automotive technician.

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