AutoCodes – Generic – B1379

B1379 Code - Ignition 3 Fault

Quick Answer

The Diagnostic Trouble Code (DTC) B1379 will set if IGNITION 3 is not active after IGNITION 1 has been active for 20 seconds. Common causes include Faulty Body Control Module (BCM), Body Control Module (BCM) harness is open or shorted, Body Control Module (BCM) 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: B1379 indicates Ignition 3 Fault.
Common causes: Common causes include Faulty Body Control Module (BCM), Body Control Module (BCM) harness is open or shorted, Body Control Module (BCM) 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.

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Code Popularity 9,054

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 19, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1379 Description

The Diagnostic Trouble Code (DTC) B1379 will set if IGNITION 3 is not active after IGNITION 1 has been active for 20 seconds. When DTC is present, SERVICE VEHICLE SOON indicator illuminates and check gauges chime will sound. A current DTC B1379 will clear when the fault is no longer present and the ignition switch is cycled. A history DTC B1379 clears when module ignition cycle counter reaches reset threshold, without a repeat of malfunction.

OBDII Code B1379 - Ignition 3 Fault - AutoCodes.com — B1379 Code - Ignition 3 Fault

What does this mean?

What are the Possible Causes of the DTC B1379?

Faulty Body Control Module (BCM)
Body Control Module (BCM) harness is open or shorted
Body Control Module (BCM) circuit poor electrical connection
Faulty Instrument Panel Cluster (IPC)

How to Fix the DTC B1379?

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 B1379 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 B1379 code?

Need more information on how to fix the B1379 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1379 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B1379 Buick — Ignition 3 Fault
B1379 Cadillac — Ignition 3 Fault
B1379 Chevrolet — Ignition 3 Fault
B1379 GMC — Ignition 3 Fault
B1379 Hyundai — Front-Driver Side Airbag Resistance Too Low
B1379 KIA — Front-Driver Side Airbag Resistance Too Low
B1379 Oldsmobile — Ignition 3 Fault
B1379 Pontiac — Ignition 3 Fault
B1379 Saturn — Ignition 3 Fault

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 B1379 Code

1. What are common symptoms of OBDII code B1379 Ignition 3 Fault?

- Common symptoms include engine misfires, rough idling, poor acceleration, and potentially stalling of the vehicle.

2. What causes the OBDII code B1379 Ignition 3 Fault?

- The code is typically triggered by issues with the ignition system, such as faulty ignition coils, spark plugs, or wiring.

3. How can I diagnose the source of the Ignition 3 Fault code?

- Diagnosing the issue usually involves inspecting and testing the ignition components, checking for loose connections, and using a scan tool to gather more data.

4. Can a faulty battery cause the B1379 code to appear?

- Yes, a weak or failing battery can sometimes lead to irregular voltage levels that affect the proper functioning of the ignition system, triggering the code.

5. Are there any simple repair tips for fixing the B1379 code?

- Simple repair tips include checking and replacing faulty spark plugs, inspecting ignition coils for damage, and ensuring all wiring connections are secure.

6. Will driving with the Ignition 3 Fault code harm my vehicle?

- Continuing to drive with the code can potentially cause further damage to the engine and other components, so it's best to address the issue promptly.

7. How much does it typically cost to repair the B1379 code?

- The cost of repairs can vary depending on the extent of the issue and the specific components that need to be replaced, but it's advisable to budget for ignition system repairs.

8. Can I reset the B1379 code myself, or should I take it to a mechanic?

- You can try resetting the code using an OBDII scanner, but if the underlying issue is not addressed, the code is likely to reappear. It's recommended to have a mechanic diagnose and repair the problem.

9. Are there any preventive measures to avoid encountering the Ignition 3 Fault code?

- Regular maintenance of the ignition system, such as replacing spark plugs and checking ignition coils, can help prevent issues that may trigger the B1379 code.

10. Is the B1379 code specific to certain car makes and models?

- The B1379 code can be found in various OBDII systems across different car makes and models, particularly those equipped with advanced engine management systems.