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B3930 2017 GMC Sierra Code - Child Security Lock Motors Circuit

Quick Answer

The B3930 diagnostic trouble code (DTC) for a 2017 GMC Sierra relates to the Child Security Lock Motors Circuit. Common causes include Faulty child security lock motors, Wiring issues or shorts in the circuit, Corrosion or damage to electrical connectors related to the child security lock system. 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
B3930 2017 GMC Sierra indicates Child Security Lock Motors Circuit.
Common causes
Common causes include Faulty child security lock motors, Wiring issues or shorts in the circuit, Corrosion or damage to electrical connectors related to the child security lock system.
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 13, 2024
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Code B3930 2017 GMC Sierra Description

The B3930 diagnostic trouble code (DTC) for a 2017 GMC Sierra relates to the Child Security Lock Motors Circuit. This code indicates a malfunction in the circuit responsible for controlling the child security lock motors in the vehicle. The child security lock system is designed to prevent the rear doors from being opened from the inside, providing an added layer of safety for passengers, particularly children. When this circuit malfunctions, it can compromise the effectiveness of the child security lock system, potentially allowing the rear doors to be opened from the inside even when the locks are engaged.

OBDII Code B3930 2017 GMC Sierra - Child Security Lock Motors Circuit
B3930 2017 GMC Sierra Code - Child Security Lock Motors Circuit

Common Causes of B3930 2017 GMC Sierra

  1. Faulty child security lock motors.
  2. Wiring issues or shorts in the circuit.
  3. Corrosion or damage to electrical connectors related to the child security lock system.
  4. Defective control module responsible for operating the child security lock motors.
  5. Impact or physical damage to the rear doors affecting the child security lock system.

Symptoms of B3930 2017 GMC Sierra

  1. Rear doors can be opened from the inside even when child security locks are engaged.
  2. Inconsistent operation of child security lock system.
  3. Warning light on the dashboard indicating a child security lock system fault.
  4. Audible clicking or buzzing noise coming from the rear doors when attempting to engage child security locks.

How to Fix B3930 2017 GMC Sierra

  1. Begin by conducting a thorough visual inspection of the child security lock system components, including the motors, wiring, and connectors.
  2. Use a multimeter to test the continuity of the wiring in the circuit and check for any shorts or open circuits.
  3. Test the child security lock motors for proper operation and replace any faulty motors as needed.
  4. Inspect the control module for any signs of damage or malfunction and replace if necessary.
  5. Clear the DTC from the vehicle's computer system after completing the repairs and test the child security lock system to ensure proper operation.

Cost to Fix B3930 2017 GMC Sierra

The cost of repairing a child security lock motors circuit issue can vary depending on the specific cause of the problem and the extent of the repairs needed. In general, the cost of parts for this repair could range from $100 to $300, with labor costs adding an additional $100 to $200. Overall, the total repair cost for addressing a B3930 DTC in a 2017 GMC Sierra could fall in the range of $200 to $500. It is important to note that these are rough estimates, and actual costs may vary based on factors such as location, labor rates, and the availability of parts. It is recommended to consult with a qualified mechanic or auto repair shop for a more accurate cost estimate tailored to your specific situation.

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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 B3930 2017 GMC Sierra Code

1. What does OBDII code B3930 mean on a 2017 GMC Sierra?

Code B3930 indicates an issue with the Child Security Lock Motors Circuit, which controls the rear door child safety locks.

2. What are common symptoms of code B3930 on a 2017 GMC Sierra?

Symptoms may include the child safety locks not activating or deactivating properly, rear doors that cannot be locked or unlocked via the child lock system, or a dashboard warning light.

3. What causes code B3930 on a 2017 GMC Sierra?

Common causes include a faulty child safety lock motor, damaged wiring or connectors in the circuit, or a malfunctioning Body Control Module (BCM).

4. How can I diagnose code B3930 on my 2017 GMC Sierra?

Start by inspecting the wiring and connectors for damage, corrosion, or loose connections in the child lock circuit. Use a diagnostic scanner to check for additional related codes and test the functionality of the child lock motors.

5. Can code B3930 cause other issues on my 2017 GMC Sierra?

While it primarily affects the child safety lock system, unresolved issues may lead to further electrical problems or improper door locking functionality.

6. How do I fix code B3930 on my 2017 GMC Sierra?

Repairs may include replacing the faulty child safety lock motor, repairing damaged wiring or connectors, or reprogramming or replacing the Body Control Module if necessary.

7. Is it safe to drive with code B3930 on a 2017 GMC Sierra?

Yes, it is generally safe to drive, but the child lock system may not function as intended, which could pose a safety risk for passengers in the rear seats.

8. How much does it cost to fix code B3930 on a 2017 GMC Sierra?

Repair costs can vary, but replacing a child safety lock motor typically costs $100-$300, while BCM repairs or replacements may cost $300-$800 depending on labor and parts.

9. Can I clear code B3930 without fixing the problem?

Clearing the code without addressing the underlying issue will likely cause it to return. Proper diagnosis and repair are necessary to resolve the problem permanently.

10. What tools are needed to troubleshoot code B3930 on a 2017 GMC Sierra?

You'll need an OBDII scanner, a multimeter for testing electrical continuity, and basic hand tools for inspecting and repairing wiring or replacing components.

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