B2958 Cadillac Code - Security System Sensor Data 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
- B2958 Cadillac indicates Security System Sensor Data 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 B2958 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 B2958 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 B2958 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 B2958 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 B2958 Cadillac Code
1. What does the OBDII code B2958 mean on a Cadillac?
The B2958 code indicates a "Security System Sensor Data Circuit High," meaning the vehicle's anti-theft system has detected an issue with the sensor signal being too high or outside the expected range.
2. What are common symptoms of the B2958 code on a Cadillac?
Common symptoms include the vehicle failing to start, the security or anti-theft light staying illuminated, and intermittent starting issues.
3. What causes the B2958 code to appear on a Cadillac?
Causes can include a faulty ignition key, damaged key fob, issues with the ignition lock cylinder, corroded or loose wiring in the circuit, or a malfunctioning Passlock sensor.
4. Can a bad ignition key trigger the B2958 code?
Yes, a worn or damaged ignition key can fail to properly communicate with the Passlock system, triggering the B2958 code.
5. How do you diagnose the B2958 code on a Cadillac?
Diagnosis involves using a scan tool to confirm the code, visually inspecting wiring and connectors in the Passlock system, testing the ignition switch, and ensuring the key or key fob is in good condition.
6. How is the B2958 code fixed on a Cadillac?
Repairs may include replacing the ignition key or lock cylinder, repairing faulty wiring or connectors, reprogramming the anti-theft system, or replacing the Passlock sensor if necessary.
7. Can you clear the B2958 code without fixing the problem?
Clearing the code without addressing the underlying issue may temporarily resolve the warning, but the problem will likely return until properly repaired.
8. Is the B2958 code unique to Cadillac vehicles?
No, the B2958 code can appear on other GM vehicles that use the Passlock anti-theft system, but it is commonly associated with Cadillacs.
9. Can a dead battery cause the B2958 code to appear?
A dead or weak battery can sometimes cause communication issues within the anti-theft system, potentially triggering this code.
10. How much does it typically cost to fix the B2958 code on a Cadillac?
Repair costs can vary, ranging from $100 to $500, depending on whether the issue is a simple key replacement or a more complex repair like wiring or sensor replacement.
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