B2958 on 2000-2005 Chevrolet Malibu — Manufacturer-Specific Body Code (commonly Security System Sensor Circuit)
1 vehicles · 1 makes · $250-$800 repair
How to diagnose and fix B2958: most-reported vehicles
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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 (2)
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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 $250 to $800, depending on the vehicle and root cause.
Which vehicles are affected by B2958?
Au7o has documented B2958 across 1 vehicle models from 1 manufacturers: Chevrolet.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.