B2948 Chevrolet 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 Chevrolet 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 Chevrolet 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 Chevrolet?
- 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 Chevrolet?
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 Chevrolet 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 B2948 Chevrolet Code
1. What does the OBDII code B2948 mean on a Chevrolet?
Code B2948 indicates a "Security System Sensor Power Circuit High" issue, meaning the vehicle's anti-theft system has detected a problem with the sensor power circuit operating at a higher voltage than expected.
2. What are the symptoms of code B2948 in a Chevrolet?
Common symptoms include difficulty starting the vehicle, the security or anti-theft light illuminating on the dashboard, and, in some cases, complete failure to start.
3. What causes the B2948 code to appear in a Chevrolet?
Common causes include a faulty security sensor, damaged or corroded wiring in the sensor power circuit, a malfunctioning body control module (BCM), or a poor electrical ground connection.
4. Can a bad battery cause the B2948 code on a Chevrolet?
Yes, a weak or failing battery can cause electrical irregularities, which may trigger the B2948 code. Ensuring the battery is in good condition is an important step in diagnosing the issue.
5. How do you diagnose the B2948 code in a Chevrolet?
Diagnosis typically involves scanning for additional codes, inspecting the wiring and connectors in the security system sensor circuit, testing the sensor's power and ground, and verifying the functionality of the BCM.
6. Can I still drive my Chevrolet with the B2948 code?
Driving may be possible, but you might experience starting issues. It is recommended to address the problem promptly to avoid being stranded.
7. How do you fix the B2948 code on a Chevrolet?
Repairs may involve replacing a faulty security sensor, repairing or replacing damaged wiring, cleaning corroded connections, or reprogramming or replacing the BCM if necessary.
8. Does the B2948 code always mean the BCM is faulty?
No, while a faulty BCM can cause this code, it is not always the root cause. Thorough diagnosis of the wiring, sensor, and connections should be performed before replacing the BCM.
9. Can a blown fuse trigger the B2948 code in a Chevrolet?
Yes, a blown fuse in the security system circuit can disrupt power to the sensor, potentially causing the B2948 code.
10. Is it expensive to repair the B2948 code on a Chevrolet?
Repair costs vary depending on the specific issue. Fixing wiring or connections is usually inexpensive, while a BCM replacement can be more costly due to parts and reprogramming fees.
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