AutoCodes – Generic – B3930

B3930 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 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 1,015

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 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 - Child Security Lock Motors Circuit - AutoCodes.com — B3930 Code - Child Security Lock Motors Circuit

What does this mean?

What are the Possible Causes of the DTC B3930?

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?

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 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 code?

Need more information on how to fix the B3930 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B3930 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B3930 Buick — Child Security Lock Motors Circuit
B3930 Cadillac — Child Security Lock Motors Circuit
B3930 Chevrolet — Child Security Lock Motors Circuit
B3930 GMC — Child Security Lock Motors Circuit

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 Code

1. What are the common symptoms of OBDII code B3930 (Child Security Lock Motors Circuit)?

The common symptoms of code B3930 include non-functioning child security locks and issues with the locking mechanism in the vehicle.

2. What are the possible causes of OBDII code B3930?

The possible causes of code B3930 include faulty child security lock motors, damaged wiring or connectors in the circuit, or a malfunctioning control module.

3. How can I diagnose OBDII code B3930?

Diagnosing code B3930 involves using a scan tool to retrieve the code, inspecting the child security lock motors and related wiring for damage, and testing the circuit for continuity.

4. Can I repair OBDII code B3930 myself?

If you have the necessary tools and expertise, you may be able to repair code B3930 yourself by replacing faulty child security lock motors, repairing damaged wiring, or reprogramming the control module if needed.

5. Are there any simple troubleshooting steps for OBDII code B3930?

Simple troubleshooting steps for code B3930 include checking the fuse related to the child security locks, ensuring the child lock switch is functioning properly, and inspecting the wiring harness for any visible damage.

6. Is it safe to continue driving with OBDII code B3930 present?

It is generally safe to continue driving with code B3930, but it is recommended to address the issue promptly to ensure the child security locks are functioning correctly in case of an emergency.

7. How much does it typically cost to repair OBDII code B3930?

The cost of repairing code B3930 can vary depending on the root cause of the issue, but it may range from around $100 to $300 for parts and labor.

8. Can OBDII code B3930 cause any other problems in the vehicle?

While code B3930 specifically relates to the child security lock motors circuit, unresolved issues with this code could potentially lead to safety concerns regarding the child locks in the vehicle.

9. Will resetting the OBDII system clear code B3930?

Resetting the OBDII system may temporarily clear code B3930, but if the underlying issue is not addressed, the code is likely to reappear after driving the vehicle for some time.

10. How long does it take to repair OBDII code B3930?

The repair time for code B3930 can vary depending on the extent of the issue and the availability of parts, but a skilled technician can typically address the problem within a few hours to a day.