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 MANUALSHYUNDAI2009SONATA SE, 3.3 FREPAIR AND DIAGNOSISBRAKESTRACTION CONTROLESC (ELECTRONIC STABILITY CONTROL) SYSTEMTROUBLESHOOTING FOR DTCC1605 CAN HARDWARE ERRORDTC DETECTING CONDITION

2009 Hyundai Sonata SE, 3.3 F

C1605 CAN Hardware error: DTC Detecting Condition

2009 Hyundai Sonata SE, 3.3 FSECTION DTC Detecting Condition

DTC DETECTING CONDITION AND POSSIBLE CAUSE

Item	Detecting Condition	Possible cause
DTC Strategy	CAN control module monitoring	Faulty HECU
Monitoring Period	Immediate during start up
Enable Conditions	Faults are detected immediately if the initialization software can't have write access to the configuration registers of the CAN-controller module.
Fail Safe	Inhibit the ESC control and allow the ABS/EBD control. Meanwhile, stop checking the ESC switch failure under the ESC control.

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.