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.

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HOMESERVICE MANUALSHYUNDAI2024ELANTRA HYBRID LIMITEDREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTCOMMUNICATION DEVICESINTEGRATED CENTRAL CONTROL UNIT DIAGNOSIS (HEV)DTC B2801-00: CAN SINGLE LINE ERROR M-CANDTC INFORMATION AND INSPECTIONDTC SETTING CONDITION

2024 Hyundai Elantra Hybrid Limited

DTC Setting Condition

2024 Hyundai Elantra Hybrid LimitedSECTION DTC Setting Condition

Troubleshooting		Condition	Possible Cause
Main Action		Monitor the CAN data	Open/Poor Connection in M-CAN High line Open/Poor Connection in M-CAN Low line Short both M-CAN High line and Low line coincidentally
Prerequisite Condition		Power Voltage: Between 9V and 16V M-CAN communication: Active
Threshold Value	Case1	M-CAN "High" line error
Threshold Value	Case2	M-CAN "Low" line error
Diagnosis Time		2sec

Component	ETM (Electrical Troubleshooting Manual) NAME	ETM
ICU*	"ICU JUNCTION BLOCK"	SD200-8

RENDER: 1.0x

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.