AutoCodes – Generic – B2955

B2955 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 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 8,049

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

What does this mean?

What are the Possible Causes of the DTC B2955?

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?

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 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 code?

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

Need Help with the Code?

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

Information for Specific Makes

B2955 Buick — Security Sensor Data Circuit Malfunction
B2955 Cadillac — Security Sensor Data Circuit Malfunction
B2955 Chevrolet — Security Sensor Data Circuit Malfunction
B2955 GMC — 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 Code

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

- Common symptoms include the security light staying on, difficulty starting the vehicle, and intermittent stalling.

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

- Possible causes include a faulty security sensor, damaged wiring or connectors in the security sensor circuit, or a problem with the body control module.

3. How can I diagnose the cause of OBDII code B2955?

- Diagnosing the issue may involve checking the wiring and connectors for damage, testing the security sensor, and scanning the body control module for related fault codes.

4. Can a DIYer repair OBDII code B2955 at home?

- While some basic checks like inspecting wiring and connectors can be done at home, diagnosing and repairing this code may require specialized tools and expertise, so professional help is often recommended.

5. Is it safe to continue driving with OBDII code B2955 present?

- It is generally not recommended to drive with this code active, as it may lead to issues like the vehicle not starting or stalling unexpectedly.

6. How much does it typically cost to repair OBDII code B2955?

- The cost of repairing this code can vary depending on the exact cause of the issue, but it may range from a simple wiring repair to a more complex sensor or module replacement.

7. Can resetting the OBDII system clear code B2955 temporarily?

- Resetting the OBDII system may temporarily clear the code, but if the underlying issue is not fixed, the code is likely to reappear after driving the vehicle.

8. Are there any preventive measures to avoid OBDII code B2955 in the future?

- Regular maintenance, checking for any signs of wiring damage, and addressing security system issues promptly can help prevent the recurrence of this code.

9. How long does it typically take to repair OBDII code B2955?

- The repair time can vary based on the cause of the issue and the complexity of the repair needed. Some cases may be resolved quickly, while others may take more time to diagnose and fix.

10. Can a faulty security sensor trigger other OBDII codes besides B2955?

- Yes, a faulty security sensor can potentially trigger other related codes or affect the overall operation of the vehicle's security system, leading to additional diagnostic challenges.