B2948 Code - Security System Sensor Power Circuit High
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
- B2948 indicates Security System Sensor Power Circuit High.
- 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 B2948 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 B2948?
- 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 B2948?
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 B2948 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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Information for Specific Makes
- B2948 Buick — Security System Sensor Power Circuit High
- B2948 Cadillac — Security System Sensor Power Circuit High
- B2948 Chevrolet — Security System Sensor Power Circuit High
- B2948 GMC — Security System Sensor Power Circuit High
Frequently Asked Questions about B2948 Code
1. What are the common symptoms of OBDII code B2948 (Security System Sensor Power Circuit High)?
- Common symptoms include the security system light staying illuminated or flashing, difficulty starting the vehicle, and potential issues with the vehicle's anti-theft system.
2. What are the possible causes of OBDII code B2948?
- The code B2948 can be triggered by a faulty security system sensor, a short circuit in the power circuit, a malfunctioning security module, or wiring issues.
3. How can I diagnose the problem related to OBDII code B2948?
- Diagnosing the issue involves using a diagnostic scanner to retrieve the code, checking the security system components for any visible damage, and testing the power circuit for continuity and proper voltage.
4. What are some repair tips for addressing OBDII code B2948?
- Repair tips include inspecting and repairing any damaged wiring, replacing the security system sensor if faulty, checking and resetting the security system module, and clearing the trouble code with a scanner.
5. Can OBDII code B2948 cause any other problems in the vehicle?
- While the code itself relates to the security system sensor power circuit, unresolved issues with the security system can potentially lead to starting problems or issues with the vehicle's anti-theft functionality.
6. Is it safe to continue driving with OBDII code B2948 present?
- It is generally not recommended to continue driving with the code active, as it can indicate underlying issues with the security system that may affect the vehicle's operation and security features.
7. How much does it typically cost to repair OBDII code B2948?
- The cost of repairing OBDII code B2948 can vary depending on the specific cause of the issue, but it may involve expenses for parts replacement, labor, and diagnostic services.
8. Can OBDII code B2948 be intermittent or sporadic?
- Yes, the code B2948 can sometimes be triggered intermittently, especially if the issue is related to a loose connection or an intermittent fault in the power circuit or sensor.
9. Will disconnecting the battery reset OBDII code B2948?
- 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.
10. How can I prevent OBDII code B2948 from coming back in the future?
- To prevent the recurrence of the code, it is crucial to address the root cause of the issue by ensuring proper wiring connections, maintaining the security system components, and addressing any underlying faults promptly.
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