B3031: Security System Controller in Learn Mode
3 vehicles · 1 makes · $10-$800 repair
Most Reported On
B3031 is an OBD-II diagnostic trouble code meaning “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. This code is most commonly reported on 2004-2012 Chevrolet Colorado, 2000-2005 Chevrolet Malibu, and 1999-2007 Chevrolet Silverado 1500, with repair costs ranging from $10 to $800.
Common Causes
Typical Repair Cost
Based on 3 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose B3031, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
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Vehicles Affected (3)
Passlock Ignition Switch Failure Causing No-Start and Security Light
Passlock Anti-Theft System Causing No-Start and Intermittent Stalling
Passlock Anti-Theft Crank-No-Start ('Service Theft System' / Flashing Security Light)
FAQ
What does B3031 mean?
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.
What are the most common causes of B3031?
The most common causes of B3031 are: 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. The specific cause varies by vehicle.
How much does it cost to fix B3031?
Repair costs for B3031 range from $10 to $800, depending on the vehicle and root cause.
Which vehicles are affected by B3031?
Au7o has documented B3031 across 3 vehicle models from 1 manufacturers: Chevrolet.
Sources (4)
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.