AutoCodes – GMC – B252C GMC

B252C GMC Code - Child Security Lock Switch Circuit

Quick Answer

The Body Control Module (BCM) monitors the voltage level in the child security door lockout switch signal circuit, when the switch is in the open position the voltage in the signal circuit will be equal to the B+ voltage level. Common causes include Faulty Child Security Lock Switch, Child Security Lock Switch harness is open or shorted, Child Security Lock Switch 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: B252C GMC indicates Child Security Lock Switch Circuit.
Common causes: Common causes include Faulty Child Security Lock Switch, Child Security Lock Switch harness is open or shorted, Child Security Lock Switch 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 967

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 May 24, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code B252C GMC Description

The Body Control Module (BCM) monitors the voltage level in the child security door lockout switch signal circuit, when the switch is in the open position the voltage in the signal circuit will be equal to the B+ voltage level. When the child security door lockout switch is pressed, the voltage within the signal circuit drops, and the BCM will detect the voltage drop and will energize the door lock relay to disable the interior rear door handles. The Diagnostic Trouble Code (DTC) will be set when the BCM has detected a short to ground on the child security lockout switch signal circuit for greater than 60 seconds.

OBDII Code B252C GMC - Child Security Lock Switch Circuit - AutoCodes.com — B252C GMC Code - Child Security Lock Switch Circuit

What does this mean?

What are the Possible Causes of the DTC B252C GMC?

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

How to Fix the DTC B252C GMC?

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 B252C GMC 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 B252C GMC code?

Need more information on how to fix the B252C GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B252C GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

B252C 2014 GMC Sierra — Child Security Lock Switch Circuit
B252C 2015 GMC Sierra — Child Security Lock Switch Circuit
B252C 2016 GMC Sierra — Child Security Lock Switch Circuit
B252C 2017 GMC Sierra — Child Security Lock Switch Circuit
B252C 2018 GMC Sierra — Child Security Lock Switch 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 B252C GMC Code

1. What does the OBDII code B252C mean for GMC vehicles?

B252C indicates a problem with the Child Security Lock Switch Circuit, which controls the rear door child locks electronically.

2. What are the common symptoms of the B252C code?

Symptoms may include rear doors not locking or unlocking correctly, child safety locks failing to engage or disengage, or a warning light on the dashboard.

3. What causes the B252C code to appear?

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

4. Can the B252C code affect vehicle safety?

Yes, it can compromise child safety if the locks fail to engage properly, leaving the rear doors operable from the inside.

5. How can you diagnose the B252C code?

Diagnosis involves scanning for codes with an OBDII scanner, visually inspecting the switch and wiring, and testing the circuit with a multimeter.

6. What repairs can fix the B252C code?

Repairs may include replacing the child lock switch, repairing damaged wiring or connectors, or reprogramming or replacing the BCM if necessary.

7. Is the B252C code specific to GMC vehicles?

While B252C is common in GMC vehicles, similar codes may appear in other makes with equivalent child lock systems.

8. Can a blown fuse cause the B252C code?

Yes, a blown fuse in the circuit powering the child lock system can trigger the B252C code.

9. How much does it typically cost to fix the B252C code?

Repair costs depend on the issue but may range from $50 for a simple switch replacement to $500 or more if the BCM needs replacement.

10. Can I drive safely with the B252C code?

You can drive, but it's important to address the issue quickly to ensure the child safety locks function properly, especially if children are passengers.