B1603Body CAN bus-off

• Hyundai/Kia code · Body control

How the car detects it

A module dropped off the body CAN network. On cars with a smart key, a failing smart-key unit can also cause a 'key not detected' no-start.

What you may notice

• Battery drain
• Possible no-start on smart-key cars

Likely causes

• PossibleBody CAN wiring
• PossibleSmart-key unit or another body module

Sources

• workshop-manuals.com › battery_drain · official document
• youcanic.com › hyundai-fault-code-dtc
• go-parts.com › obd-b1603

Backed by an official manufacturer document.

From Obdaryn's Hyundai/Kia pack, exactly as the app shows it, with the public sources above. Guidance only; confirm with a workshop.