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Engine-Codes – GMC – B1372 GMC

B1372 GMC Code - Device Ignition On and Start Circuit Low

Quick Answer

The B1372 GMC code indicates a problem with the Device Ignition On and Start Circuit being lower than the expected value. Common causes include Faulty ignition switch, Damaged wiring or connectors in the ignition system, Defective ignition control module. 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
B1372 GMC indicates Device Ignition On and Start Circuit Low.
Common causes
Common causes include Faulty ignition switch, Damaged wiring or connectors in the ignition system, Defective ignition control module.
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 15, 2024
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Code B1372 GMC Description

The B1372 GMC code indicates a problem with the Device Ignition On and Start Circuit being lower than the expected value. This code is typically associated with issues related to the ignition system and starting circuit of the vehicle. When this code is triggered, it can affect the vehicle's ability to start properly, leading to potential stalling or no-start conditions. The ignition system plays a crucial role in starting the engine by providing the spark needed for combustion. If this circuit is not functioning correctly, it can result in poor engine performance, reduced fuel efficiency, and even engine misfires.

OBDII Code B1372 GMC - Device Ignition On and Start Circuit Low
B1372 GMC Code - Device Ignition On and Start Circuit Low

Common Causes of B1372 GMC

  1. Faulty ignition switch
  2. Damaged wiring or connectors in the ignition system
  3. Defective ignition control module
  4. Malfunctioning starter motor

Symptoms of B1372 GMC

  1. Engine cranks but does not start
  2. Intermittent starting issues
  3. Engine stalls shortly after starting
  4. Check Engine Light illuminated
  5. Reduced fuel efficiency

How to Fix B1372 GMC

  1. Begin by conducting a thorough inspection of the ignition system, checking for any visible damage to wiring or connectors.
  2. Test the ignition switch and ignition control module using a multimeter to determine if they are functioning correctly.
  3. Inspect the starter motor for any signs of wear or damage and test its operation.
  4. Replace any faulty components identified during the diagnostic process, such as the ignition switch, wiring, ignition control module, or starter motor.
  5. Clear the diagnostic trouble codes from the vehicle's computer and test the vehicle to ensure the issue has been resolved.

Cost to Fix B1372 GMC

The cost of repairing the Device Ignition On and Start Circuit Low issue can vary depending on the specific cause of the problem and the cost of parts and labor. On average, the repair for this code can range from $200 to $500, including parts and labor. However, it is important to note that the actual cost may be higher or lower based on the extent of the repairs needed and the rates charged by auto repair shops. It is recommended to obtain quotes from local shops to get a more accurate estimate for this repair. Keep in mind that diagnostic time and labor rates can vary based on location, vehicle make and model, and engine type.

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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 B1372 GMC Code

1. What are the common symptoms of OBDII code B1372 GMC?

The common symptoms of OBDII code B1372 GMC include issues with starting the vehicle, the engine not turning over, and potential illumination of the Check Engine light.

2. What can cause the Device Ignition On and Start Circuit Low code B1372 GMC?

The B1372 code in GMC vehicles is typically triggered by a malfunction in the ignition switch, faulty wiring connections, a defective starter relay, or a problem with the starter motor itself.

3. How serious is the B1372 GMC trouble code?

While the B1372 code may not always prevent the vehicle from running, it can lead to starting issues and potential breakdowns if left unresolved. It is recommended to address the underlying cause promptly to avoid further complications.

4. Can I still drive my vehicle with the B1372 code present?

It is not advisable to drive your vehicle with the B1372 code active, as it can lead to starting problems and potential stalling, posing a safety risk. It is recommended to address the issue before operating the vehicle.

5. How do I diagnose and repair the B1372 GMC trouble code?

Diagnosing the B1372 code involves inspecting the ignition system components, checking for loose connections, testing the starter relay, and verifying the functionality of the starter motor. Repair may involve replacing faulty components, repairing wiring issues, or resetting the code after fixing the underlying problem.

6. Can a DIY enthusiast fix the B1372 code issue?

While some DIY enthusiasts may have the skills to diagnose and repair the B1372 code, it is recommended to seek professional help, especially if dealing with complex electrical systems. Incorrect repairs can lead to further damage or safety hazards.

7. How much does it cost to fix the B1372 GMC trouble code?

The cost of fixing the B1372 code can vary depending on the underlying cause, parts needed for replacement, and labor costs. It is advisable to consult a mechanic for a proper diagnosis and cost estimate.

8. Will disconnecting the battery reset the B1372 trouble code?

Disconnecting the battery may temporarily clear the trouble code, but it will not fix the underlying issue causing the B1372 code. It is recommended to diagnose and repair the problem to prevent the code from reoccurring.

9. Can extreme weather conditions trigger the B1372 GMC trouble code?

Extreme weather conditions, such as excessive heat or moisture, can potentially affect the electrical components associated with the ignition system and trigger the B1372 trouble code. It is essential to keep the vehicle well-maintained to prevent such issues.

10. Is the B1372 code specific to GMC vehicles only?

The B1372 trouble code is specific to GMC vehicles and relates to issues with the Device Ignition On and Start Circuit Low. Other vehicle manufacturers may have different codes or descriptions for similar problems in their systems.

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