B3031 on Pontiac: How to Diagnose & Fix
Security System Controller in Learn Mode
1 Pontiac model · 1 documented issue
B3031 on Pontiac by model: symptoms, diagnosis and fix
The G6's Passlock theft-deterrent system can falsely trip, illuminating the security light and preventing the engine from starting. The common cause is a worn ignition lock cylinder/Passlock sensor that fails to read the lock rotation correctly. The well-known 10-minute relearn trick only resets it temporarily; the fault usually returns until the cylinder/sensor is replaced.
Common Symptoms
- Car cranks but won't start
- Security/anti-theft (padlock) light on or flashing
- Intermittent no-start
- Starts after waiting ~10 minutes
How to Fix
Temporary: turn key to ON and wait ~10 minutes until the security light stops flashing (repeat the relearn cycle as needed). Permanent fix is replacing the ignition lock cylinder / Passlock sensor and relearning the system, sometimes with a fresh dealer key.
Sources for this issue (3)
B3031 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 B3031 mean on a Pontiac?
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 Pontiac it is documented across 1 model: G6.
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 on a Pontiac?
Repair costs vary widely with the root cause and Pontiac model; each issue on this page carries its own estimate where one is published.
Looking for B3031 on a different make?
View B3031 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.