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 Description
This DTC sets when a communication error between SJB and other control units occur.
(* Control Units : BCM (Body Control Module), CLU (Cluster), SMK (Smart Key), SJB (Smart Junction Box), PSM (Power Seat Module)
Case 1: After short between CAN Low Line and High Line, short to ground together.
Case 2: After short between CAN Low Line and High Line, short to power together.
* This code sets when the module is unable to transmit data on the CAN Line. It may be possible to receive data on the CAN Line.
This code reports "BUS OFF" status when a data transmit error count is over 255. The purpose is to verify the status of CAN controller and CAN communication line when error is detected.
Depending on operation condition, some modules which are connected to the CAN line may not detect B1603.
Also, B1602 coincides with B1603 at all times.
CAN Error : MIL On, CAN Bus Error : No MIL
NO RELATED
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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.