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Engine-Codes – GMC – B1370 2017 GMC Sierra

B1370 2017 GMC Sierra Code - Control Module Ignition ON and Start Circuit

Quick Answer

The B1370 diagnostic trouble code (DTC) for a 2017 GMC Sierra refers to an issue with the control module ignition ON and start circuit. Common causes include Faulty ignition switch, Defective control module, Wiring or connection issues. 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
B1370 2017 GMC Sierra indicates Control Module Ignition ON and Start Circuit.
Common causes
Common causes include Faulty ignition switch, Defective control module, Wiring or connection issues.
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 12, 2024
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Code B1370 2017 GMC Sierra Description

The B1370 diagnostic trouble code (DTC) for a 2017 GMC Sierra refers to an issue with the control module ignition ON and start circuit. In simpler terms, this code indicates a problem with the circuit that controls the ignition system and allows the vehicle to start. The control module is responsible for managing various functions within the vehicle, including starting the engine, so any issues with this circuit can have significant implications for the vehicle's performance.

OBDII Code B1370 2017 GMC Sierra - Control Module Ignition ON and Start Circuit
B1370 2017 GMC Sierra Code - Control Module Ignition ON and Start Circuit

Common Causes of B1370 2017 GMC Sierra

  1. Faulty ignition switch
  2. Defective control module
  3. Wiring or connection issues
  4. Battery or charging system problems
  5. Faulty starter motor

Symptoms of B1370 2017 GMC Sierra

  1. Difficulty starting the vehicle
  2. Engine cranks but does not start
  3. Engine stalls or runs erratically
  4. Check engine light illuminated
  5. Loss of drivability

How to Fix B1370 2017 GMC Sierra

  1. Diagnose the issue using a scan tool to retrieve the DTC and check the control module and ignition system components.
  2. Inspect the ignition switch, wiring, and connections for any signs of damage or corrosion.
  3. Test the battery and charging system to ensure they are functioning correctly.
  4. Replace the faulty control module or ignition switch, if necessary.
  5. Clear the DTC and perform a test drive to verify that the issue has been resolved.

Cost to Fix B1370 2017 GMC Sierra

The typical repair costs for addressing the B1370 code can vary depending on the specific cause of the issue and the parts required for repair. In general, the cost of parts for replacing a control module or ignition switch can range from $200 to $500, while labor costs can range from $100 to $300. Overall, the total repair cost for this issue could range from $300 to $800, but it is advisable to check with local auto repair shops for a more accurate estimate based on the specific circumstances. Keep in mind that labor rates can vary depending on the location and the type of repair facility, so it is recommended to research and compare prices before proceeding with the repair.

What does this mean?

Tech Notes for B1370 2017 GMC Sierra

B1370:01 Control Module Ignition ON and Start Circuit Short to Battery

B1370:04 Control Module Ignition ON and Start Circuit Short to Ground or Open









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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 B1370 2017 GMC Sierra Code

1. What are the common symptoms of OBDII code B1370 in a 2017 GMC Sierra?

The common symptoms include issues with starting the vehicle, intermittent starting problems, and possible illumination of the check engine light.

2. What does the OBDII code B1370 for Control Module Ignition ON and Start Circuit indicate in a 2017 GMC Sierra?

This code indicates a fault in the control module's ignition ON and start circuit, which can affect the starting system of the vehicle.

3. What are the possible causes of OBDII code B1370 in a 2017 GMC Sierra?

Possible causes include a faulty ignition switch, damaged wiring or connectors in the ignition circuit, or a malfunctioning control module.

4. How can I diagnose the OBDII code B1370 in a 2017 GMC Sierra?

Diagnosis involves checking the ignition switch, inspecting the wiring and connectors for damage, and testing the control module for proper functionality using a diagnostic scanner.

5. Can I repair OBDII code B1370 in a 2017 GMC Sierra myself?

Depending on your skill level and access to tools, you may be able to repair this code yourself by replacing the faulty ignition switch, repairing damaged wiring, or replacing the control module if needed.

6. Is it safe to continue driving my 2017 GMC Sierra with OBDII code B1370?

It is not recommended to continue driving the vehicle with this code, as it can lead to potential starting issues and further damage to the ignition system.

7. Does fixing OBDII code B1370 require specialized equipment?

While basic tools may be sufficient for some repairs, diagnosing and fixing this code may require a diagnostic scanner and specialized knowledge of automotive electrical systems.

8. How much does it typically cost to repair OBDII code B1370 in a 2017 GMC Sierra?

The cost of repair can vary depending on the exact cause of the code and whether you perform the repairs yourself or take the vehicle to a professional mechanic. Costs may range from a few hundred to a few thousand dollars.

9. Can a dead battery cause OBDII code B1370 to appear in a 2017 GMC Sierra?

A dead or weak battery can potentially trigger this code if it affects the ignition system's power supply. It's recommended to check the battery's condition as part of the diagnostic process.

10. How urgent is it to address OBDII code B1370 in a 2017 GMC Sierra?

It is advisable to address this code as soon as possible to prevent potential starting issues and ensure the proper functioning of the vehicle's ignition system.

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