Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Circuit Description
DTC will set when BCM is in learn mode. Scan tool will show the Passlock(R) data voltage when BCM is in learn mode and ignition switch is cycled. DTC B3031 will set when ignition 0 is inactive and Passlock(R) key code has not been learned. When DTC is set the vehicle will not start and the SECURITY indicator will be on. BCM will go to sleep and wake up after fault is cleared. DTC will clear from history after ignition switch is cycled on and off 100 times with no faults present. DTC can also be cleared using scan tool. DTC will also clear after BCM learns correct key code.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.