AutoCodes – Generic – B3031

B3031 Code - Security System Controller In Learn Mode

Quick Answer

When learning a coded key, the Body Control Module (BCM) is placed in learn mode. Common causes include Faulty Body Control Module (BCM), Body Control Module harness is open or shorted, Body Control Module 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: B3031 indicates Security System Controller In Learn Mode.
Common causes: Common causes include Faulty Body Control Module (BCM), Body Control Module harness is open or shorted, Body Control Module 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 7,131

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 02, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B3031 Description

When learning a coded key, the Body Control Module (BCM) is placed in learn mode. Diagnostic Trouble Code (DTC) B3031 will be set automatically as an indicator that the system is in learning mode and not as a fault indicator. On some model-year vehicles, the instructions for adding keys includes the direction to always use two learned keys. This DTC will be set if that direction is not followed. If only one learned key is available, then Replacing Keys must be performed. Once the coded key is learned, learn mode will be exited and the DTC cleared. If the BCM does not exit learn mode, DTC B3031 will remain current and indicate a fault. The instrument cluster security indicator will illuminate, and the driver information center will display a message.

OBDII Code B3031 - Security System Controller In Learn Mode - AutoCodes.com — B3031 Code - Security System Controller In Learn Mode

What does this mean?

What are the Possible Causes of the DTC B3031?

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

How to Fix the DTC B3031?

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 B3031 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 B3031 code?

Need more information on how to fix the B3031 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B3031 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B3031 Buick — Security System Controller In Learn Mode
B3031 Cadillac — Security System Controller In Learn Mode
B3031 Chevrolet — Security System Controller In Learn Mode
B3031 GMC — Security System Controller In Learn Mode

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 B3031 Code

1. What are the common symptoms of OBDII code B3031 - Security System Controller In Learn Mode?

The common symptoms of code B3031 include the security system light staying on, difficulty starting the vehicle, and issues with key fob recognition.

2. What can cause OBDII code B3031 to trigger?

Code B3031 is typically triggered when the security system controller enters learn mode due to a communication error between the controller and the vehicle's immobilizer system.

3. How can I diagnose OBDII code B3031?

Diagnosing code B3031 involves using a professional OBDII scanner to retrieve the code, checking for any related trouble codes, and inspecting the security system components for any visible damage or loose connections.

4. Can a weak car battery cause OBDII code B3031 to appear?

Yes, a weak car battery can lead to communication issues between the security system controller and the immobilizer system, triggering code B3031.

5. What are some repair tips for resolving OBDII code B3031?

Repair tips for resolving code B3031 include checking and repairing any damaged wiring or connections, ensuring the key fob is functioning properly, and resetting the security system controller to exit learn mode.

6. Is it safe to continue driving with OBDII code B3031 present?

It is not recommended to continue driving with code B3031 present, as it can lead to potential security system malfunctions that may prevent the vehicle from starting or operating normally.

7. Can I reset OBDII code B3031 myself?

You can attempt to reset code B3031 yourself by using an OBDII scanner to clear the code, but it is important to diagnose and address the underlying issue to prevent the code from reoccurring.

8. How much does it typically cost to fix OBDII code B3031?

The cost of fixing code B3031 can vary depending on the underlying cause of the issue, but it may range from a simple DIY repair to more extensive troubleshooting by a professional mechanic.

9. Will disconnecting the car battery reset OBDII code B3031?

Disconnecting the car battery may temporarily reset code B3031, but the issue is likely to reoccur if the root cause of the problem, such as a faulty security system component, is not addressed.

10. Can extreme weather conditions trigger OBDII code B3031?

Extreme weather conditions, such as extreme heat or cold, can potentially affect the performance of the security system components and lead to communication errors that trigger code B3031.