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 MANUALSHYUNDAI2017IONIQ ELECTRICREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTCOMMUNICATION DEVICESINTEGRATED GATEWAY POWER MODULE DIAGNOSIS (EV)DTC C1804-00: CAN TIME-OUT LKASDTC INFORMATIONDTC DETECTING CONDITION

2017 Hyundai Ioniq Electric

DTC Information: DTC Detecting Condition

2017 Hyundai Ioniq ElectricSECTION DTC Detecting Condition

Item

Conditions for setting DTC

Possible Cause

DTC Strategy

Check CAN communication

Open/poor connection in ⁽¹⁾'s C-CAN "High" line
Open/poor connection in ⁽¹⁾'s C-CAN "Low" line
Faulty ⁽¹⁾'s power supply

Enable Conditions

IG key "ON"
Power voltage 9V~16V
C-CAN bus is normal

Threshold Value

⁽¹⁾'s C-CAN message is not received

Diagnostic Time

10 sec

DTC Erasing

Active DTC

Erased DTC after solved problem

History DTC

Can be erased by GDS

NOTE:

⁽¹⁾	LKAS : "LANE KEEPING ASSIST UNIT"

CGW* : "IGPM_GATEWAY"

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.