B3031 on Chevrolet
Security System Controller in Learn Mode
B3031 on Chevrolet vehicles indicates security system controller in learn mode. Au7o has documented this code across 1 Chevrolet model — most commonly on Silverado 1500. B3031 is a manufacturer-specific body code (common on GM vehicles) indicating the body control module has entered, or is stuck in, the security/anti-theft key learn mode. It is often an informational status rather than a true failure, set automatically while a coded key is being programmed and cleared once learning completes. It only indicates a real fault if the module fails to exit learn mode, which can disable starting and illuminate the security indicator. Typical repair costs on Chevrolet range from $10 to $350, depending on the specific model and root cause.
Common Causes of B3031
- •Module currently in normal key-learning procedure (informational)
- •Key programming not completed correctly
- •Failed key relearn / fewer than required keys learned
- •Faulty or unrecognized transponder key
- •BCM software or programming fault
- •Faulty body control module preventing learn-mode exit
B3031 on Chevrolet by Model
Chevrolet Silverado 1500(1 issue)
- Passlock Anti-Theft Crank-No-Start ('Service Theft System' / Flashing Security Light)1999-2007
The Passlock II theft-deterrent system reads a Hall-effect sensor and magnet in the ignition lock cylinder. As the sensor or lock cylinder wears, the BCM sees an out-of-range voltage, flags a theft fault, flashes the SECURITY light, and disables fuel injection so the engine cranks but won't start. Owners get stranded with a 'Service Theft System' or security light and a no-start that often clears after a wait. Extremely common and heavily searched on these trucks.
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View B3031 across all makes →Frequently Asked Questions
What does B3031 mean on Chevrolet?▼
B3031 stands for "Security System Controller in Learn Mode." B3031 is a manufacturer-specific body code (common on GM vehicles) indicating the body control module has entered, or is stuck in, the security/anti-theft key learn mode. It is often an informational status rather than a true failure, set automatically while a coded key is being programmed and cleared once learning completes. It only indicates a real fault if the module fails to exit learn mode, which can disable starting and illuminate the security indicator. On Chevrolet specifically, this code is documented across 1 model.
What causes B3031 on Chevrolet vehicles?▼
Common causes on Chevrolet: Module currently in normal key-learning procedure (informational), Key programming not completed correctly, Failed key relearn / fewer than required keys learned, Faulty or unrecognized transponder key, BCM software or programming fault. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix B3031 on a Chevrolet?▼
Repair costs on Chevrolet range from $10 to $350, depending on the specific model and root cause.
Which Chevrolet models have B3031 documented?▼
Au7o has documented B3031 on 1 Chevrolet model: Silverado 1500.