B2957 GMC 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 GMC 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.
Code B2957 GMC Description
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.
What are the Possible Causes of the DTC B2957 GMC?
- 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 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 B2957 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.
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Frequently Asked Questions about B2957 GMC Code
1. What are the common symptoms of OBDII code B2957 GMC (Security System Sensor Data Circuit Low)?
The common symptoms include intermittent or constant security system warning lights on the dashboard, difficulty starting the vehicle, and potential immobilization of the vehicle.
2. What are some possible causes of OBDII code B2957 GMC?
Possible causes of this code include a faulty security system sensor, damaged wiring or connectors in the security system circuit, or issues with the security system control module.
3. How can I diagnose the source of OBDII code B2957 GMC?
Diagnosing this code involves using a diagnostic scanner to retrieve the code, checking the wiring and connectors in the security system sensor circuit, and testing the security system sensor for proper functionality.
4. Can a DIY enthusiast repair OBDII code B2957 GMC?
While some basic troubleshooting steps can be taken by DIY enthusiasts, repairing this code often requires advanced diagnostic tools and knowledge. It is recommended to consult a professional mechanic for accurate diagnosis and repair.
5. What are the repair options for OBDII code B2957 GMC?
Repair options may include replacing the faulty security system sensor, repairing damaged wiring or connectors, or reprogramming the security system control module. The specific repair needed will depend on the root cause of the code.
6. Is it safe to continue driving with OBDII code B2957 GMC present?
It is not recommended to continue driving with this code present, as it may lead to potential security system malfunctions or immobilization of the vehicle. It is advisable to address the issue promptly to avoid any further complications.
7. How much does it typically cost to repair OBDII code B2957 GMC?
The cost of repairing this code can vary depending on the cause of the issue, the extent of the repairs needed, and the labor rates of the mechanic. It is advisable to obtain quotes from different repair shops for an accurate estimate.
8. Can resetting the OBDII system clear OBDII code B2957 GMC?
Resetting the OBDII system may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear. It is important to diagnose and repair the root cause of the code for a long-term solution.
9. Are there any preventative measures to avoid OBDII code B2957 GMC?
Regular maintenance checks, including inspecting the security system components, can help prevent issues that may trigger this code. Ensuring proper functioning of the security system can also help avoid this problem.
10. Can extreme weather conditions trigger OBDII code B2957 GMC?
Extreme weather conditions such as excessive heat or moisture can potentially affect the sensors and wiring in the security system, leading to issues that may trigger this code. It is important to keep the vehicle protected in such conditions.
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