B2958: How to Diagnose & Fix — Manufacturer-Specific Body Code (commonly Security System Sensor Circuit)
2 vehicles · 1 makes · $150-$800 repair
How to diagnose and fix B2958: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Chevrolet Malibu · 2000–2005
A common failure on early-2000s Malibu models is the Passlock security system falsely detecting a theft condition, which can disable fuel delivery and prevent the engine from starting. Owners report the SECURITY light flashing, long wait times before restart, and in some cases intermittent stalling or crank-no-start behavior. The root cause is typically failure in the ignition lock cylinder sensor/housing or related wiring causing incorrect resistance/voltage readings to the body control module.
Common Symptoms
- SECURITY light flashing or staying on
- Crank but no start
- Starts after waiting 10 minutes
- Intermittent stalling
- No injector pulse/fuel disable
- Random no-start especially in hot weather
How to Fix
Diagnosis usually starts by checking for SECURITY lamp behavior, BCM-related codes, and verifying Passlock sensor data during crank. Repairs commonly involve replacing the ignition lock cylinder housing/switch assembly, repairing wiring at the column, and performing the Passlock relearn procedure. Some owners also replace the ignition switch if heat-related internal contact failure is present.
Sources for this issue (1)
Chevrolet Suburban · 2015–2025
The 2015+ Suburban uses an electronic steering column lock that can malfunction, causing a clicking noise from the steering column, failure to recognize the key fob, or preventing the vehicle from starting. The electronic lock module replaces the traditional key-cylinder lock and communicates with the body control module (BCM) to verify the key fob is present before allowing the engine to start. When the lock module fails, it may click repeatedly without unlocking, or it may not engage at all, leaving the steering unlocked even when the vehicle is off.
Common Symptoms
- Rapid clicking noise from steering column
- Vehicle will not start — "Steering Column Lock" message
- Key fob not detected despite fresh battery
- Steering wheel does not lock when vehicle is off
- Intermittent no-start condition
- Multiple clicks before engine starts
How to Fix
The steering column lock actuator module needs replacement ($150-$400 for parts, $200-$400 labor). The module is located inside the steering column and requires partial disassembly to access. A scan tool is needed to program the new module to the BCM after installation. In some cases, a BCM software update at the dealer resolves the clicking without hardware replacement. If the vehicle will not start due to a failed lock module, a tow to the dealer is required — there is no manual override.
Sources for this issue (1)
Find B2958 by make
Browse every documented model and issue for your make.
B2958 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does B2958 mean?
B2958 stands for "Manufacturer-Specific Body Code (commonly Security System Sensor Circuit)." B2958 is a manufacturer-specific body code, so its exact meaning varies by automaker. On many GM vehicles it indicates a Security/Anti-Theft System Sensor Circuit fault (signal out of range, often reading high), where the Body Control Module sees an abnormal voltage from a theft-deterrent sensor; on some other makes it relates to an HVAC/defrost door circuit. Because the definition is not standardized, the precise cause should be confirmed against the specific make and model. It is generally a comfort/security-system fault rather than a safety-critical driveability issue.
What are the most common causes of B2958?
The most common causes of B2958 are: Faulty security/anti-theft sensor (GM applications), Wiring or connector fault in the affected circuit, Short to voltage or open in the sensor circuit, Failing Body Control Module (BCM), HVAC blend/defrost door actuator fault (on makes that use it for HVAC), Corroded grounds or poor connections. The specific cause varies by vehicle.
How much does it cost to fix B2958?
Repair costs for B2958 range from $150 to $800, depending on the vehicle and root cause.
Which vehicles are affected by B2958?
Au7o has documented B2958 across 2 vehicle models from 1 manufacturers: Chevrolet.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.