AutoCodes – GMC – B1374 GMC

B1374 GMC 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 GMC 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 1,291

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 GMC 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 GMC - Ignition 1 Fault - AutoCodes.com — B1374 GMC Code - Ignition 1 Fault

What does this mean?

What are the Possible Causes of the DTC B1374 GMC?

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 GMC?

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 GMC 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 GMC code?

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

Need Help with the Code?

Get the B1374 GMC 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 GMC Code

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

When this code is triggered, you may experience issues such as engine misfires, rough idling, stalling, or difficulty starting the vehicle.

2. What are the possible causes of OBDII code B1374 GMC?

The Ignition 1 Fault code B1374 in a GMC vehicle can be caused by a faulty ignition coil, damaged spark plugs, wiring issues, or a problem with the ignition control module.

3. How can I diagnose the OBDII code B1374 GMC issue?

Diagnosing the Ignition 1 Fault code involves using an OBDII scanner to retrieve the code, checking the ignition system components for any visible damage, and conducting tests to pinpoint the exact cause of the problem.

4. Can driving with OBDII code B1374 GMC cause further damage to the vehicle?

Continuing to drive with the Ignition 1 Fault code B1374 can potentially lead to more severe engine problems, reduced fuel efficiency, and increased emissions. It is recommended to address the issue promptly.

5. What are some repair tips for fixing OBDII code B1374 GMC?

Repairing the Ignition 1 Fault code may involve replacing the faulty ignition coil, spark plugs, or ignition control module, as well as repairing any damaged wiring. It's advisable to follow the manufacturer's repair procedures.

6. Is it safe to reset the OBDII code B1374 GMC without fixing the underlying issue?

Simply resetting the code without addressing the root cause of the problem can lead to the code reappearing and the same issues persisting. It is best to diagnose and fix the problem first.

7. How much does it typically cost to repair OBDII code B1374 GMC?

The cost of repairing the Ignition 1 Fault code B1374 can vary depending on the specific cause of the issue, the labor rates of the repair shop, and the cost of parts. It is recommended to obtain quotes from different service providers.

8. Can a DIY enthusiast fix OBDII code B1374 GMC at home?

Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to address the Ignition 1 Fault code themselves by following repair guides or tutorials. However, professional assistance is recommended for complex issues.

9. Will OBDII code B1374 GMC cause the check engine light to illuminate?

Yes, the Ignition 1 Fault code B1374 will trigger the check engine light to come on in your GMC vehicle. It is essential to address the underlying problem to prevent further issues.

10. How soon should I address OBDII code B1374 GMC once detected?

It is advisable to address the Ignition 1 Fault code B1374 as soon as possible after detection to prevent potential damage to the engine, ensure optimal vehicle performance, and maintain fuel efficiency.