B2948 Cadillac 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 Cadillac 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 Cadillac 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 Cadillac?
- 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 Cadillac?
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 Cadillac 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 Cadillac Code
1. What does the OBDII code B2948 mean on a Cadillac?
The code B2948 indicates a high voltage issue in the security system sensor power circuit, which is part of the vehicle's anti-theft system.
2. What are the common symptoms of the B2948 code in a Cadillac?
Symptoms can include the security light staying illuminated, the vehicle failing to start, or intermittent starting issues.
3. What causes the B2948 code to trigger on a Cadillac?
Common causes include a faulty security system sensor, damaged wiring, loose or corroded connections, or a malfunctioning body control module (BCM).
4. Can a weak battery cause the B2948 code?
Yes, a weak or failing battery can cause voltage irregularities that may trigger this code.
5. How do I diagnose the B2948 code on my Cadillac?
Start by checking for damaged wiring or loose connections in the security system circuit. Then test the security system sensor and inspect the BCM for faults.
6. Can I drive my Cadillac with the B2948 code active?
Driving may be possible, but starting issues or a complete failure to start could occur. It’s best to address the issue promptly.
7. How is the B2948 code repaired in a Cadillac?
Repairs may involve fixing or replacing damaged wiring, cleaning corroded connections, replacing the faulty sensor, or reprogramming/replacing the BCM.
8. How much does it cost to fix the B2948 code on a Cadillac?
Repair costs vary, but sensor replacement can range from $100 to $300, while BCM replacement or reprogramming may cost $300 to $800, depending on the model.
9. Can I fix the B2948 code on my Cadillac myself?
If you’re experienced with automotive electronics, you can inspect and repair wiring or replace the sensor. However, BCM issues often require professional tools and expertise.
10. Will clearing the code with a scan tool fix the B2948 issue?
Clearing the code will reset it temporarily, but the underlying issue must be repaired to prevent the code from returning.
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