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Engine-Codes – Scion – B1402 Scion

B1402 Scion Code - Immobiliser Key Check NG

Quick Answer

The B1402 Scion code indicates an issue with the immobilizer key check system in the vehicle. Common causes include Faulty immobilizer key, Weak battery in the key fob, Wiring issues in the immobilizer system. 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
B1402 Scion indicates Immobiliser Key Check NG.
Common causes
Common causes include Faulty immobilizer key, Weak battery in the key fob, Wiring issues in the immobilizer system.
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 17, 2024
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Code B1402 Scion Description

The B1402 Scion code indicates an issue with the immobilizer key check system in the vehicle. The immobilizer system is a security feature that prevents the engine from starting unless the correct key is used. When the system detects a problem with the key check, it can lead to the engine not starting or stalling while driving. This code is usually triggered when the immobilizer system fails to recognize the key or if there is a communication error between the key and the vehicle's computer.

OBDII Code B1402 Scion - Immobiliser Key Check NG
B1402 Scion Code - Immobiliser Key Check NG

Common Causes of B1402 Scion

  1. Faulty immobilizer key
  2. Weak battery in the key fob
  3. Wiring issues in the immobilizer system
  4. Faulty immobilizer control module
  5. Communication error between key and vehicle's computer

Symptoms of B1402 Scion

  1. Engine not starting
  2. Stalling while driving
  3. Immobilizer light flashing on the dashboard
  4. Inability to turn the ignition key

How to Fix B1402 Scion

  1. Check the immobilizer key battery: Start by replacing the battery in the key fob to ensure it is not the cause of the issue.
  2. Inspect wiring: Check the wiring connections in the immobilizer system for any loose connections or damage. Repair or replace any faulty wiring.
  3. Reprogram the key: If the key is not being recognized by the immobilizer system, reprogramming the key may be necessary. This can usually be done by a dealership or a qualified automotive locksmith.
  4. Replace immobilizer control module: If the control module is found to be faulty, it may need to be replaced. This is a more complex repair that may require professional assistance.
  5. Clear codes and test: After performing the necessary repairs, clear the diagnostic trouble codes from the vehicle's computer and test the immobilizer system to ensure the issue has been resolved.

Cost to Fix B1402 Scion

The cost of repairing a B1402 Scion code can vary depending on the specific cause of the issue and the labor rates in your area. In general, replacing the key fob battery can cost around $5-$20, while repairing wiring or reprogramming the key may range from $50-$200. If the immobilizer control module needs to be replaced, the cost can be higher, potentially ranging from $200-$500 or more. It's important to factor in diagnostic time and labor rates, which can vary between $80 and $150 per hour at most auto repair shops. Be sure to check with local shops for a more accurate estimate based on your specific situation.

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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 B1402 Scion Code

1. What are the common symptoms of OBDII code B1402 in a Scion related to the Immobiliser Key Check NG?

- Common symptoms include difficulty starting the vehicle, the engine not turning over, and the ignition not recognizing the key.

2. What does the "Immobiliser Key Check NG" mean in the context of OBDII code B1402 for a Scion?

- "NG" stands for "No Good," indicating that the immobilizer system does not recognize the key being used to start the vehicle.

3. What are the possible causes of OBDII code B1402 (Immobiliser Key Check NG) in a Scion?

- Possible causes include a faulty key transponder, a malfunctioning immobilizer unit, issues with the key fob battery, or wiring problems in the immobilizer system.

4. Can I still drive my Scion if OBDII code B1402 (Immobiliser Key Check NG) is triggered?

- In most cases, the vehicle may not start or will experience difficulty starting when this code is triggered, making it unsafe to drive until the issue is resolved.

5. How can I diagnose and repair OBDII code B1402 (Immobiliser Key Check NG) in my Scion?

- To diagnose this issue, you may need a professional OBDII scanner to read the code and pinpoint the exact cause. Repairs may involve reprogramming the key, replacing the key fob battery, or repairing/replacing the immobilizer unit.

6. Will resetting the OBDII code B1402 (Immobiliser Key Check NG) in my Scion fix the issue?

- While clearing the code may temporarily remove the warning light, the underlying problem causing the code to trigger will still need to be addressed to ensure the vehicle functions properly.

7. Is it possible to bypass or disable the immobilizer system to avoid OBDII code B1402 in my Scion?

- Bypassing or disabling the immobilizer system is not recommended, as it can compromise the security of your vehicle and may lead to other issues down the line.

8. Are there any DIY tips for troubleshooting OBDII code B1402 (Immobiliser Key Check NG) in a Scion?

- DIY tips may include checking the key fob battery, ensuring the key is properly programmed, and inspecting the wiring connections related to the immobilizer system.

9. How much does it typically cost to repair OBDII code B1402 (Immobiliser Key Check NG) in a Scion?

- The cost of repairs for this code can vary depending on the exact cause of the issue, but it may range from replacing a key fob battery to more involved repairs with the immobilizer unit.

10. Can a locksmith or dealership help with resolving OBDII code B1402 (Immobiliser Key Check NG) in my Scion?

- Yes, locksmiths and dealerships with the necessary equipment and expertise can assist in diagnosing and repairing issues related to the immobilizer system and OBDII code B1402.

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