AutoCodes – Buick – B1379 Buick

B1379 Buick 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 Buick 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 750

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

What does this mean?

What are the Possible Causes of the DTC B1379 Buick?

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 Buick?

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 Buick 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.

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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 B1379 Buick Code

1. What does the OBDII code B1379 mean on a Buick?

B1379 indicates an "Ignition 3 Fault," meaning there is an issue with the circuit responsible for the third ignition input in the vehicle's electrical system.

2. What are the common symptoms of code B1379 in a Buick?

Symptoms may include the engine not starting, intermittent loss of power to electrical components, or dashboard warning lights staying on.

3. What causes the B1379 Ignition 3 Fault code to appear?

Common causes include a faulty ignition switch, damaged wiring or connectors in the Ignition 3 circuit, or a malfunctioning Body Control Module (BCM).

4. Can I drive my Buick with the B1379 code?

Itâ€™s not recommended to drive with this code active, as it may lead to electrical malfunctions or prevent the engine from restarting.

5. How do I diagnose the B1379 code on my Buick?

Start by checking the Ignition 3 circuit for loose or damaged wiring, inspect the ignition switch for faults, and use a scan tool to test the BCM for proper operation.

6. How do I fix the B1379 Ignition 3 Fault code?

Repairs may involve replacing the ignition switch, repairing damaged wiring or connectors, or reprogramming or replacing the BCM if necessary.

7. Can a dead battery cause the B1379 code?

A weak or dead battery typically wonâ€™t cause this code, but power fluctuations during startup or low voltage can exacerbate electrical issues.

8. Will clearing the B1379 code fix the issue?

Clearing the code may reset it temporarily, but if the underlying problem isnâ€™t resolved, the code will reappear.

9. How much does it cost to repair a B1379 code on a Buick?

The repair cost depends on the cause. Replacing an ignition switch might cost $150â€“$300, while BCM repairs or replacements could exceed $500.

10. Can I fix code B1379 on my Buick myself?

If you have basic electrical knowledge and tools, you can inspect wiring and connectors. However, BCM diagnosis and replacement may require professional expertise.