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.
DTC B1603: CAN Bus Off: General Description
Body Control System consists of 4 units via the CAN communication.
* Body CAN communication Control Units: BCM(Body Control Module), SJB(Smart Junction Box), SMK(Smart Key Module), AVN(Audio Video Navigation)
* CAN (Controller Area Network): CAN is serial bus communication type which links not only communication system but also control units each other.
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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.