AutoCodes – GMC – B2955 2014 GMC Sierra

B2955 2014 GMC Sierra Code - Security Sensor Data Circuit Malfunction

Quick Answer

When an ignition key is inserted into the ignition lock cylinder and the ignition is switched ON, the transponder embedded in the key is energized by the exciter coil surrounding the ignition lock cylinder. Common causes include Faulty Immobilizer Control Module, Immobilizer Control Module harness is open or shorted, Immobilizer 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: B2955 2014 GMC Sierra indicates Security Sensor Data Circuit Malfunction.
Common causes: Common causes include Faulty Immobilizer Control Module, Immobilizer Control Module harness is open or shorted, Immobilizer 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 242

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 01, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2955 2014 GMC Sierra Description

When an ignition key is inserted into the ignition lock cylinder and the ignition is switched ON, the transponder embedded in the key is energized by the exciter coil surrounding the ignition lock cylinder. The transponder transmits a signal to the Immobilizer Control Module. The Immobilizer Control Module translates this signal to a serial data message which is sent to the Body Control Module (BCM). The BCM then compares this value to a value stored in memory. If the value is correct, the BCM will send the prerelease password via the serial data circuit to the Engine Control Module (ECM). If the learned key code does not match or a transponder value is not received, the BCM will send the start disable password to the ECM. The Diagnostic Trouble Code (DTC) will be set when the BCM detects a circuit fault on the immobilizer antenna circuits.

OBDII Code B2955 2014 GMC Sierra - Security Sensor Data Circuit Malfunction - AutoCodes.com — B2955 2014 GMC Sierra Code - Security Sensor Data Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC B2955 2014 GMC Sierra?

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

How to Fix the DTC B2955 2014 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 B2955 2014 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 B2955 2014 GMC Sierra code?

Need more information on how to fix the B2955 2014 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2955 2014 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 B2955 2014 GMC Sierra Code

1. What does the OBDII code B2955 mean in a 2014 GMC Sierra?

B2955 indicates a Security Sensor Data Circuit Malfunction, meaning there's an issue with the communication or functionality of the vehicle's security system sensor.

2. What are the common symptoms of code B2955 in a 2014 GMC Sierra?

Common symptoms include the vehicle failing to start, the security light staying illuminated on the dashboard, or intermittent starting issues.

3. What causes the B2955 code to appear in a 2014 GMC Sierra?

The code can be triggered by a faulty security sensor, damaged wiring or connectors in the security system circuit, or issues with the Body Control Module (BCM).

4. Can a weak battery cause the B2955 code in a 2014 GMC Sierra?

Yes, a weak or failing battery can cause voltage irregularities that may trigger security system malfunctions, including the B2955 code.

5. How do I diagnose the B2955 code in my 2014 GMC Sierra?

Use an OBDII scanner to confirm the code, inspect the wiring and connectors related to the security system, and test the security sensor for proper functionality.

6. Is it possible to clear the B2955 code without repairs on a 2014 GMC Sierra?

Clearing the code with a scanner may temporarily remove it, but if the underlying issue isn't fixed, the code and symptoms will likely return.

7. Can a faulty key fob cause a B2955 code in a 2014 GMC Sierra?

While not common, a malfunctioning key fob or an issue with the transponder in the key can interfere with the security system and potentially contribute to the code.

8. How much does it cost to fix the B2955 code on a 2014 GMC Sierra?

Repair costs can vary widely depending on the issue but typically range between $100 and $400, depending on whether the problem lies with the sensor, wiring, or BCM.

9. Can I drive my 2014 GMC Sierra with the B2955 code active?

While the vehicle may still run, the B2955 code can cause starting issues or leave you stranded if the security system disables the ignition. Itâ€™s best to address the problem promptly.

10. What tools are needed to fix the B2955 code on a 2014 GMC Sierra?

Youâ€™ll need a diagnostic scanner, a multimeter to test wiring and voltage, and basic tools for inspecting and repairing connections or replacing components.