AutoCodes – GMC – B2955 GMC

B2955 GMC 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 GMC 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.

Save to My Repairs My Repairs

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

Code Popularity 2,674

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
Add Comment

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

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

What does this mean?

What are the Possible Causes of the DTC B2955 GMC?

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 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 B2955 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 B2955 GMC code?

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

Need Help with the Code?

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

Information for Specific GMC Models

B2955 2014 GMC Sierra — Security Sensor Data Circuit Malfunction
B2955 2015 GMC Sierra — Security Sensor Data Circuit Malfunction
B2955 2016 GMC Sierra — Security Sensor Data Circuit Malfunction
B2955 2017 GMC Sierra — Security Sensor Data Circuit Malfunction
B2955 2018 GMC Sierra — Security Sensor Data Circuit Malfunction

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 GMC Code

1. What are the common symptoms of OBDII code B2955 GMC (Security Sensor Data Circuit Malfunction)?

- Common symptoms include issues with remote keyless entry, security system malfunctions, and difficulties starting the vehicle.

2. What are the possible causes of OBDII code B2955 GMC?

- The code B2955 GMC can be triggered by faulty security sensors, damaged wiring, a defective body control module (BCM), or issues with the ignition switch.

3. How can I diagnose the Security Sensor Data Circuit Malfunction?

- Diagnosing this code usually involves using a scan tool to retrieve the specific trouble code, checking the wiring and connections related to the security sensors, and testing the BCM and ignition switch for proper functionality.

4. Can I still drive my vehicle with the B2955 GMC code present?

- It is not recommended to drive the vehicle with the B2955 code present, as it can cause security system malfunctions and potentially lead to issues starting the vehicle.

5. How can I repair the Security Sensor Data Circuit Malfunction?

- Repairing the B2955 GMC code often involves fixing or replacing faulty security sensors, repairing damaged wiring, replacing the BCM if necessary, or addressing any issues with the ignition switch.

6. Is it possible to reset the B2955 GMC code without repairing the underlying issue?

- While clearing the trouble code may temporarily turn off the check engine light, it will not resolve the underlying issue causing the Security Sensor Data Circuit Malfunction.

7. Can a DIY enthusiast fix the B2955 GMC code themselves?

- DIY enthusiasts with automotive repair experience may be able to diagnose and repair the B2955 GMC code, but it is recommended to consult a professional if unsure about the repair process.

8. Are there any preventive measures to avoid triggering the B2955 GMC code?

- Regularly checking and maintaining the security sensors, wiring, BCM, and ignition switch can help prevent issues that may trigger the B2955 GMC code.

9. How do I know if the B2955 GMC code has been successfully resolved?

- After repairing the issue causing the code B2955 GMC, you can use a scan tool to clear the trouble code and monitor the vehicle for any reoccurrence of the code or related symptoms.

10. Can the B2955 GMC code be related to other codes or issues in the vehicle?

- The B2955 GMC code may be related to other security system codes or issues, so it is important to perform a thorough diagnosis to identify and address all related problems.