AutoCodes – Generic – B1351

B1351 Code - Ignition Key-In Circuit Short To Battery

Quick Answer

The Instrument Cluster (IC) receives the key-in-ignition warning status from the Smart Junction Box (SJB) over the Medium Speed Controller Area Network (MS-CAN). Common causes include Faulty Ignition Key-In Switch (Part of the ignition switch), Ignition Key-In Switch harness is open or shorted, Ignition Key-In Switch circuit poor electrical connection. 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: B1351 indicates Ignition Key-In Circuit Short To Battery.
Common causes: Common causes include Faulty Ignition Key-In Switch (Part of the ignition switch), Ignition Key-In Switch harness is open or shorted, Ignition Key-In Switch circuit poor electrical connection.
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 6,688

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 Mar 15, 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 B1351 Description

The Instrument Cluster (IC) receives the key-in-ignition warning status from the Smart Junction Box (SJB) over the Medium Speed Controller Area Network (MS-CAN). The key-in-ignition warning switch (part of the ignition switch) is hardwired to the SJB through the circuit. When the key is inserted into the ignition lock cylinder, the key-in-ignition switch closes and supplies voltage to the SJB. The SJB monitors the door ajar input from the LH front door and the key-in-ignition switch status. When the key is inserted into the ignition lock cylinder and the LH front door is open or ajar, the SJB sends the IC a chime request message to sound the key-in-ignition warning chime. The headlamps on warning chime sound when the driver door is opened with the ignition switch in the OFF position, the key is not in the ignition lock cylinder, and the headlamp switch is in the PARK or HEADLAMP ON position.

OBDII Code B1351 - Ignition Key-In Circuit Short To Battery - AutoCodes.com — B1351 Code - Ignition Key-In Circuit Short To Battery

What does this mean?

What are the Possible Causes of the DTC B1351?

Faulty Ignition Key-In Switch (Part of the ignition switch)
Ignition Key-In Switch harness is open or shorted
Ignition Key-In Switch circuit poor electrical connection
Faulty Smart Junction Box (SJB)

How to Fix the DTC B1351?

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 B1351 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 B1351 code?

Need more information on how to fix the B1351 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1351 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B1351 Hyundai — Passenger-Side Air Bag Module First Stage Open
B1351 KIA — Passenger-Side Air Bag Module First Stage Open

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 B1351 Code

What does OBDII code B1351 mean?

OBDII code B1351 indicates a malfunction in the ignition key-in circuit, specifically showing a short to battery, which means the system detects a constant signal as if the key is always in the ignition.

What are common symptoms of code B1351?

Common symptoms include the vehicle not starting, issues with the ignition system, or the dashboard warning lights illuminating, particularly those related to the immobilizer or security system.

What could cause code B1351 to trigger?

Potential causes include a faulty ignition switch, damaged wiring or connectors in the key-in circuit, or a malfunctioning Body Control Module (BCM) that is not receiving the correct signals.

Can I drive my car with code B1351?

While it may be possible to drive the car, it is not advisable as the code indicates an issue that could lead to starting problems or affect other electrical systems in the vehicle.

How can I diagnose code B1351?

To diagnose code B1351, you can start by visually inspecting the ignition switch and wiring for damage, then use a multimeter to test for continuity and proper voltage in the key-in circuit.

What repairs are typically needed for code B1351?

Repairs may include replacing a faulty ignition switch, repairing damaged wiring, or reprogramming or replacing the Body Control Module (BCM) if it's found to be defective.

Is it safe to reset the code B1351?

Resetting the code may temporarily clear the error, but it is essential to address the underlying issue to prevent reoccurrence and ensure the vehicle functions properly.

How can I prevent code B1351 from coming back?

To prevent code B1351 from recurring, ensure all electrical connections are secure, maintain the ignition system, and regularly check for wear and tear on wiring and components related to the ignition circuit.

What tools do I need to fix code B1351?

Tools you may need include a multimeter for testing electrical circuits, basic hand tools for removing components, and a code reader or scanner to monitor the system and clear codes after repairs.