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Engine-Codes – GMC – B1374 GMC

B1374 GMC Code - Ignition 1 Fault

Quick Answer

The B1374 GMC code refers to an Ignition 1 Fault, indicating a problem with the ignition system in the vehicle. Common causes include Faulty ignition switch, Malfunctioning ignition coil or ignition module, Damaged wiring or poor electrical connections. 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 ignition switch, Malfunctioning ignition coil or ignition module, Damaged wiring or poor electrical connections.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 16, 2024
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Code B1374 GMC Description

The B1374 GMC code refers to an Ignition 1 Fault, indicating a problem with the ignition system in the vehicle. The ignition system is crucial for starting the engine and ensuring proper combustion within the cylinders. When this fault occurs, it can lead to issues with starting the vehicle, poor engine performance, and potential safety hazards.

OBDII Code B1374 GMC - Ignition 1 Fault
B1374 GMC Code - Ignition 1 Fault

Common Causes of B1374 GMC

  1. Faulty ignition switch.
  2. Malfunctioning ignition coil or ignition module.
  3. Damaged wiring or poor electrical connections.
  4. Failed crankshaft position sensor.
  5. Issues with the engine control module (ECM).

Symptoms of B1374 GMC

  1. Difficulty starting the engine or frequent stalling.
  2. Engine misfires or rough idling.
  3. Reduced engine power and acceleration.
  4. Illumination of the Check Engine Light.
  5. Increased fuel consumption.

How to Fix B1374 GMC

  1. Begin by using a diagnostic scanner to retrieve the specific trouble code and identify the exact cause of the Ignition 1 Fault.
  2. Inspect the ignition system components, including the ignition switch, ignition coil, and wiring connections, for any visible damage or signs of wear.
  3. Test the ignition components using a multimeter to check for proper voltage and continuity.
  4. Replace any faulty components, such as the ignition switch, ignition coil, or wiring harness, as needed.
  5. Clear the trouble code from the vehicle's computer using the diagnostic scanner and test the vehicle to ensure the issue has been resolved.

Cost to Fix B1374 GMC

The cost of repairing an Ignition 1 Fault can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. On average, the repair cost for this type of problem can range from $150 to $500, including parts and labor. However, it is essential to note that labor rates can vary significantly based on location, vehicle make and model, and the expertise of the technician. It is advisable to obtain quotes from multiple repair shops to ensure a competitive price for the repair.

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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 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.

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