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 MANUALSHYUNDAI2017SANTA FE SE, FWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTDRIVERS ASSISTANCE SYSTEMS - ADASAUTONOMOUS EMERGENCY BRAKING SYSTEM DIAGNOSISDTC C1646: CAN MESSAGE FAILURE - TCUDTC INFORMATIONDTC DETECTING CONDITION

2017 Hyundai Santa Fe SE, FWD

DTC Information: DTC Detecting Condition

2017 Hyundai Santa Fe SE, FWDSECTION DTC Detecting Condition

DTC DETECTING CONDITIONS AND POSSIBLE CAUSES

Item	Detecting Condition	Possible Cause
DTC Strategy	Monitoring CAN messages	Faulty Gear position system (Inhibitor switch) Faulty TCM system
Enable Conditions	Engine run (engine run at least for 2 seconds) Battery voltage is between 9 volt and 16 volt No CAN Bus off
Threshold Value	When it received abnormal gear position message (Invalid) from TCM via CAN.
Diagnosis Time	500 milliseconds
Fail Safe	SCC/AEB Disengagement/Shutdown SCC/AEB Warning lamp turns 'ON'

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.