AutoCodes – GMC – B3930 2017 GMC Sierra

B3930 2017 GMC Sierra Code - Child Security Lock Motors Circuit

Quick Answer

The Body Control Module (BCM) controls the Child Security Lock Relay when it receives a command to lockout the rear doors. Common causes include Faulty Child Security Lock Relay, Child Security Lock Relay harness is open or shorted, Child Security Lock Relay 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: B3930 2017 GMC Sierra indicates Child Security Lock Motors Circuit.
Common causes: Common causes include Faulty Child Security Lock Relay, Child Security Lock Relay harness is open or shorted, Child Security Lock Relay 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 205

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 Jun 17, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B3930 2017 GMC Sierra Description

The Body Control Module (BCM) controls the Child Security Lock Relay when it receives a command to lockout the rear doors. The relay will apply voltage to both child security circuits at the rear door latches to disable the interior door handles. The Diagnostic Trouble Code (DTC) sets when the BCM detects a short to voltage, short to ground or an open/high resistance on the child security lock disable relay control circuit.

OBDII Code B3930 2017 GMC Sierra - Child Security Lock Motors Circuit - AutoCodes.com — B3930 2017 GMC Sierra Code - Child Security Lock Motors Circuit

What does this mean?

What are the Possible Causes of the DTC B3930 2017 GMC Sierra?

Faulty Child Security Lock Relay
Child Security Lock Relay harness is open or shorted
Child Security Lock Relay circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B3930 2017 GMC Sierra?

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 B3930 2017 GMC Sierra 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 B3930 2017 GMC Sierra code?

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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.