B2948 Buick 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 Buick 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 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 B2948 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 B2948 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 B2948 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 B2948 Buick Code
1. What does the OBDII code B2948 mean on a Buick?
B2948 indicates a problem with the security system sensor power circuit, specifically that the circuit voltage is higher than expected.
2. What are the common symptoms of code B2948 in a Buick?
Common symptoms include the security or anti-theft light staying on, issues starting the vehicle, or intermittent power to the security system.
3. What causes the B2948 code to appear?
This code is typically caused by a malfunctioning security system sensor, damaged wiring, poor electrical connections, or a faulty control module.
4. Can a dead battery trigger the B2948 code?
A weak or dead battery itself may not trigger the code, but low voltage during startup could impact the security system and potentially lead to this issue.
5. How do you diagnose the B2948 code on a Buick?
Start by visually inspecting the wiring and connectors in the security system, checking for corrosion, damage, or loose connections. Use a multimeter to test circuit voltage and continuity.
6. Is it safe to drive a Buick with the B2948 code?
Driving may be possible, but you could experience difficulty starting the vehicle or encounter security system malfunctions. It's best to address the issue promptly.
7. How do you fix the B2948 code on a Buick?
Repairs may include replacing a faulty security system sensor, repairing damaged wiring, cleaning connectors, or reprogramming or replacing the control module.
8. Can clearing the B2948 code solve the problem?
Clearing the code with a scanner may temporarily reset the system, but if the underlying issue isn’t resolved, the code will likely return.
9. How much does it cost to fix the B2948 code?
Repair costs vary depending on the issue. Wiring repairs may be inexpensive, while replacing a control module or sensor could cost several hundred dollars, including labor.
10. Can a faulty key fob cause the B2948 code?
A faulty or improperly programmed key fob is unlikely to directly cause this code, but issues with the fob could interfere with the security system’s operations.
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