AutoCodes – Chevrolet – B1374 Chevrolet

B1374 Chevrolet Code - Ignition 1 Fault

Quick Answer

The Diagnostic Trouble Code (DTC) B1374 will set if IGNITION 1 input is not active after the engine has been running 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: B1374 Chevrolet indicates Ignition 1 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 2,299

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 B1374 Chevrolet Description

The Diagnostic Trouble Code (DTC) B1374 will set if IGNITION 1 input is not active after the engine has been running for 20 seconds. When DTC is present, SERVICE VEHICLE SOON indicator illuminates and check gauges chime will sound. A current DTC B1374 will clear when the fault is no longer present and the ignition switch is cycled. A history DTC B1374 clears when module ignition cycle counter reaches reset threshold, without a repeat of malfunction.

OBDII Code B1374 Chevrolet - Ignition 1 Fault - AutoCodes.com — B1374 Chevrolet Code - Ignition 1 Fault

What does this mean?

What are the Possible Causes of the DTC B1374 Chevrolet?

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 B1374 Chevrolet?

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 B1374 Chevrolet 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 B1374 Chevrolet code?

Need more information on how to fix the B1374 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1374 Chevrolet 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 B1374 Chevrolet Code

1. What are the common symptoms of OBDII code B1374 Chevrolet (Ignition 1 Fault)?

The common symptoms include issues with starting the vehicle, rough idling, and potential stalling.

2. What could be causing the OBDII code B1374 Chevrolet (Ignition 1 Fault) to appear?

Possible causes of this code include a faulty ignition switch, damaged wiring or connectors in the ignition 1 circuit, or a malfunctioning ignition 1 relay.

3. How can I diagnose the Ignition 1 Fault related to code B1374 in my Chevrolet?

You can diagnose this issue by checking the ignition switch, inspecting the wiring and connectors in the ignition 1 circuit, and testing the ignition 1 relay for proper functionality.

4. Can a DIY enthusiast repair the OBDII code B1374 Chevrolet (Ignition 1 Fault)?

Yes, if you have the necessary tools and knowledge, you may be able to repair this issue yourself by replacing the faulty ignition switch, repairing damaged wiring, or addressing issues with the ignition 1 relay.

5. Is it safe to continue driving my Chevrolet with the OBDII code B1374 (Ignition 1 Fault) present?

It is not recommended to continue driving your vehicle with this fault code, as it can lead to potential starting or stalling issues that may compromise safety.

6. How important is it to address the OBDII code B1374 Chevrolet (Ignition 1 Fault) promptly?

It is important to address this fault code promptly to prevent any further damage to the ignition system and ensure the reliable operation of your vehicle.

7. Can a faulty ignition 1 relay cause the OBDII code B1374 Chevrolet to trigger?

Yes, a malfunctioning ignition 1 relay can cause the code B1374 to appear, as it disrupts the proper operation of the ignition system.

8. What are some tips for preventing the OBDII code B1374 Chevrolet (Ignition 1 Fault) from reoccurring?

Regularly inspecting and maintaining the ignition system, ensuring proper wiring connections, and using quality components can help prevent the reoccurrence of this fault code.

9. Will resetting the OBDII system clear the B1374 Chevrolet code (Ignition 1 Fault)?

Resetting the OBDII system may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear.

10. How can a professional mechanic help in diagnosing and repairing the OBDII code B1374 Chevrolet (Ignition 1 Fault)?

A professional mechanic can use specialized tools and expertise to accurately diagnose the issue, perform necessary repairs or replacements, and ensure the proper functioning of the ignition system.