B2947 Buick Code - Security System Sensor Power 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
- B2947 Buick indicates Security System Sensor Power 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 B2947 Buick 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 B2947 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 B2947 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 B2947 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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Frequently Asked Questions about B2947 Buick Code
1. What are common symptoms of OBDII code B2947 Buick (Security System Sensor Power Circuit Low)?
The common symptoms include the security system light staying on, difficulty starting the vehicle, and possible issues with key fob operation.
2. What are the possible causes of OBDII code B2947 in a Buick?
Possible causes include a faulty security system sensor, a short or open circuit in the power supply to the sensor, or a malfunctioning security system control module.
3. How can I diagnose the OBDII code B2947 in my Buick?
Diagnosing this code typically involves checking the wiring and connections to the security system sensor, testing the sensor's resistance, and using a scan tool to communicate with the security system module for further diagnosis.
4. Can I still drive my Buick with OBDII code B2947 present?
It is not recommended to drive the vehicle with this code present, as it may lead to security system malfunctions or potential starting issues.
5. How can I repair OBDII code B2947 Buick (Security System Sensor Power Circuit Low)?
Repairing this code may involve replacing the faulty security system sensor, repairing any damaged wiring or connections, or reprogramming the security system module if needed.
6. Will disconnecting the battery reset the OBDII code B2947 in my Buick?
Disconnecting the battery may temporarily clear the code, but it is important to address the underlying issue causing the code to prevent it from reoccurring.
7. Can a DIY enthusiast fix OBDII code B2947 in a Buick?
Depending on the level of expertise, a DIY enthusiast may be able to diagnose and repair this code by following the manufacturer's service manual or seeking guidance from online resources.
8. Is OBDII code B2947 in a Buick a serious issue?
While it may not directly affect the vehicle's drivability, ignoring this code can lead to potential security system malfunctions or starting problems, making it important to address promptly.
9. How much does it cost to repair OBDII code B2947 in a Buick?
The cost of repairing this code can vary depending on the cause of the issue, the parts needed for repair, and whether the repair is done at a dealership or an independent repair shop.
10. Can a faulty security system sensor cause other OBDII codes to appear in a Buick?
Yes, a faulty security system sensor can sometimes trigger other related codes or cause issues with the overall operation of the vehicle's security system.
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