AutoCodes – Toyota – B1402 Toyota

B1402 Toyota Code - Immobiliser Key Check NG

Quick Answer

The Main Body ECU (Network Gateway ECU) stores this code if an improper key (a key not registered in the main body ECU (network gateway ECU)) is inserted into the ignition key cylinder. Common causes include Faulty Key, Faulty Main Body ECU (Network Gateway ECU). 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 Toyota indicates Immobiliser Key Check NG.
Common causes: Common causes include Faulty Key, Faulty Main Body ECU (Network Gateway ECU).
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 1,296

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 Apr 07, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code B1402 Toyota Description

The Main Body ECU (Network Gateway ECU) stores this code if an improper key (a key not registered in the main body ECU (network gateway ECU)) is inserted into the ignition key cylinder. The OBDII code sets when an improper key (a key not registered in the main body ECU (network gateway ECU)) is inserted into the ignition key cylinder.

OBDII Code B1402 Toyota - Immobiliser Key Check NG - AutoCodes.com — B1402 Toyota Code - Immobiliser Key Check NG

What does this mean?

What are the Possible Causes of the DTC B1402 Toyota?

Faulty Key
Faulty Main Body ECU (Network Gateway ECU)

How to Fix the DTC B1402 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 B1402 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 B1402 Toyota code?

Need more information on how to fix the B1402 Toyota code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1402 Toyota code diagnosed by a professional: Find a repair shop in your area

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 Toyota Code

1. What are the common symptoms of OBDII code B1402 Toyota - Immobiliser Key Check NG?

The common symptoms include difficulty starting the vehicle, engine stalling, and the immobilizer light staying illuminated.

2. What are the possible causes of OBDII code B1402 Toyota - Immobiliser Key Check NG?

Possible causes include a faulty immobilizer system, issues with the key transponder, wiring problems, or a malfunctioning Engine Control Module (ECM).

3. How can I diagnose the OBDII code B1402 Toyota - Immobiliser Key Check NG?

Diagnosis typically involves using a scan tool to retrieve the stored fault codes, checking the immobilizer system for proper operation, inspecting the key transponder, and examining the wiring for any damage or loose connections.

4. Can I still drive my vehicle with OBDII code B1402 Toyota - Immobiliser Key Check NG?

It is not recommended to drive the vehicle with this code present, as it may lead to unexpected stalling or starting issues, potentially leaving you stranded.

5. How can I reset the OBDII code B1402 Toyota - Immobiliser Key Check NG?

Resetting the code requires fixing the underlying issue first, which may involve repairing the immobilizer system, key transponder, or related wiring. Once the issue is resolved, the code can be cleared using a scan tool.

6. Are there any DIY repair tips for fixing OBDII code B1402 Toyota - Immobiliser Key Check NG?

DIY repair tips include checking the key battery, ensuring the key is synchronized with the immobilizer system, and inspecting the wiring harness for any visible damage.

7. Can a locksmith help with OBDII code B1402 Toyota - Immobiliser Key Check NG?

A locksmith specializing in automotive key programming may be able to help diagnose and repair issues related to the immobilizer system or key transponder causing this code.

8. How much does it cost to fix OBDII code B1402 Toyota - Immobiliser Key Check NG?

The cost of repair can vary depending on the root cause of the issue. Simple fixes like replacing a key battery may be inexpensive, while more complex repairs involving the immobilizer system or ECM can be costly.

9. How long does it take to repair OBDII code B1402 Toyota - Immobiliser Key Check NG?

The repair time can vary based on the complexity of the issue. Simple fixes may take a short amount of time, while more involved repairs could require several hours or even days, especially if parts need to be ordered.

10. Is it necessary to visit a dealership for OBDII code B1402 Toyota - Immobiliser Key Check NG repair?

While a dealership may have specialized knowledge and tools for diagnosing and repairing this code, independent automotive repair shops and locksmiths with the right expertise can also effectively address the issue.