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.
IBU (SMK + BCM + TPMS) & VCU Control Module (SMARTRA Error)
When turning the ignition switch or EV READY on, the VCU begins communication with the IBU (SMK + BCM + TPMS) by sending a VIN (Vehicle Identification Number) request signal for the operation of the vehicle and the motor. The IBU (SMK + BCM + TPMS) sends an "Ignition Approval Not Possible" signal to the VCU when the Immobilizer cannot perform ignition. In this case, the VCU enters an ignition inhibition state and the motor cannot be operated. On the other hand, the IBU (SMK + BCM + TPMS) sends an "Ignition Approval" signal to the VCU including the VIN and learnt status information when the Immobilizer can turn the "EV READY" mode on.
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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.