AutoCodes – Buick – B2957 Buick

B2957 Buick Code - Security System Sensor Data Circuit Low

Quick Answer

The Passlock™ system is provided in order to prevent vehicle theft if the ignition lock cylinder is forced to rotate or the ignition switch is operated while separated from the ignition lock cylinder case. Common causes include Faulty Security System Sensor, Security System Sensor harness is open or shorted, Security System Sensor 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: B2957 Buick indicates Security System Sensor Data Circuit Low.
Common causes: Common causes include Faulty Security System Sensor, Security System Sensor harness is open or shorted, Security System Sensor 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 2,905

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 Feb 20, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2957 Buick Description

The Passlock™ system is provided in order to prevent vehicle theft if the ignition lock cylinder is forced to rotate or the ignition switch is operated while separated from the ignition lock cylinder case. The Body Control Module (BCM) provides security system sensor power and low reference for the Passlock™ sensor. The BCM also measures the security system sensor voltage.
When the correct key is used to start the vehicle, a magnet on the lock cylinder passes close to the Passlock™ sensor within the ignition lock cylinder case. The magnet activates the security hall effect sensor in the Passlock™ sensor which completes a circuit from the security sensor signal circuit through a resistor to the security sensor low reference circuit. The resistance value will vary from vehicle to vehicle. The BCM will measure the voltage on the security sensor signal circuit and compare this voltage to a previously learned voltage. If the voltage measured is within the valid range, the BCM will send a class 2 message to the Powertrain Control Module (PCM) to enable vehicle starting. If the voltage measured is not within the valid range, a class 2 message will be sent to the PCM to disable starting of the vehicle.

OBDII Code B2957 Buick - Security System Sensor Data Circuit Low - AutoCodes.com — B2957 Buick Code - Security System Sensor Data Circuit Low

What does this mean?

What are the Possible Causes of the DTC B2957 Buick?

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

How to Fix the DTC B2957 Buick?

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 B2957 Buick 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.

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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 B2957 Buick Code

1. What are the common symptoms of OBDII code B2957 in a Buick related to the Security System Sensor Data Circuit Low?

- Common symptoms may include the security system light staying on, difficulty starting the vehicle, and potential issues with the vehicle's anti-theft system.

2. What can cause the OBDII code B2957 in a Buick to trigger?

- The code may trigger due to faulty security system sensors, damaged wiring, a malfunctioning security module, or issues with the key fob.

3. How can I diagnose the Security System Sensor Data Circuit Low issue in my Buick?

- Diagnosis typically involves checking the security system sensors, inspecting the wiring for damage or loose connections, and using a scan tool to identify the specific cause of the circuit low condition.

4. Is it safe to continue driving my Buick with the B2957 code related to the Security System Sensor Data Circuit Low?

- It is recommended to address the issue promptly to prevent potential security system malfunctions or starting problems. Continuing to drive with this code unresolved may lead to further complications.

5. Can I reset the OBDII code B2957 in my Buick myself?

- While clearing the code can be done using an OBDII scanner, it is crucial to investigate and fix the underlying cause to prevent the code from reoccurring.

6. Are there any DIY repair tips for resolving the Security System Sensor Data Circuit Low problem in a Buick?

- DIY repair tips may include checking and repairing any damaged wiring, ensuring the security system sensors are functioning correctly, and ensuring the key fob is in good working condition.

7. Will replacing the security system sensors fix the B2957 code in my Buick?

- Replacing the security system sensors may resolve the issue if they are the root cause of the circuit low condition. However, it is essential to diagnose the problem accurately before replacing any components.

8. How much does it typically cost to repair the Security System Sensor Data Circuit Low issue in a Buick?

- The cost of repair can vary depending on the specific cause of the problem, the labor rates in your area, and whether any components need to be replaced. It is advisable to consult a mechanic for an accurate estimate.

9. Can extreme weather conditions affect the Security System Sensor Data Circuit Low code in a Buick?

- Extreme weather conditions, such as excessive heat or moisture, can potentially impact the sensors or wiring related to the security system, leading to the circuit low issue. Ensure these components are properly shielded and protected.

10. How long does it typically take to repair the B2957 code related to the Security System Sensor Data Circuit Low in a Buick?

- The repair time can vary based on the complexity of the issue and the availability of parts. Simple fixes like repairing wiring may take less time, while more intricate problems might require more extensive troubleshooting and repair.