B2947 GMC 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 GMC 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 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 B2947 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 B2947 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 B2947 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 B2947 GMC Code
1. What are the common symptoms of OBDII code B2947 GMC (Security System Sensor Power Circuit Low)?
The common symptoms include intermittent or constant issues with the vehicle's security system, such as the alarm going off unexpectedly or difficulty starting the engine.
2. What are the possible causes of OBDII code B2947 GMC?
Possible causes of this code include a faulty security system sensor, damaged wiring or connectors in the power circuit, or a malfunctioning control module.
3. How can I diagnose the cause of OBDII code B2947 GMC?
Diagnosing the cause of this code typically involves conducting a thorough inspection of the security system components, checking the power circuit for continuity, and using a scan tool to gather data from the control module.
4. Can I drive my vehicle with OBDII code B2947 GMC?
It is not recommended to drive the vehicle with this code present, as it may indicate a potential security system issue that could affect the vehicle's operation and safety.
5. How can I repair OBDII code B2947 GMC?
Repairing this code often involves repairing or replacing the faulty security system sensor, repairing damaged wiring or connectors, and resetting the control module to clear the code.
6. Are there any DIY tips for fixing OBDII code B2947 GMC?
While some basic troubleshooting steps can be taken, it is recommended to seek professional help to accurately diagnose and repair this code to ensure the vehicle's security system functions properly.
7. How much does it cost to fix OBDII code B2947 GMC?
The cost of fixing this code can vary depending on the exact cause of the issue, the extent of the repairs needed, and the labor rates of the repair shop. It is advisable to get a diagnosis and estimate from a qualified mechanic.
8. Can a bad battery trigger OBDII code B2947 GMC?
A failing or weak battery can potentially affect the power circuit and trigger this code, so it's important to ensure the battery is in good condition when troubleshooting this issue.
9. Will disconnecting the battery reset OBDII code B2947 GMC?
Disconnecting the battery may temporarily clear the code, but it is not a recommended long-term solution as the underlying issue causing the code will still need to be addressed to prevent it from reoccurring.
10. Is OBDII code B2947 GMC a common problem in GMC vehicles?
While this code may not be as common as some other OBDII codes, it can still occur in GMC vehicles, particularly those with security system sensor or power circuit issues.
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