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 MANUALSHYUNDAI2013SANTA FE SPORT 2.0T, AWDREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTINFOTAINMENTTELEMATICS UNIT DIAGNOSISDTC B2859: CDMA MODEM FAILDTC INFORMATIONDTC DETECTING CONDITION

2013 Hyundai Santa Fe Sport 2.0T, AWD

DTC Information: DTC Detecting Condition

2013 Hyundai Santa Fe Sport 2.0T, AWDSECTION DTC Detecting Condition

Item	Detecting Condition	Possible cause
DTC Strategy	Cannot communicate with modem chip	TMU (MTS Module)
Enable Conditions	Ignition ON Battery voltage is between 9V and 16V The main board and modem chip board should be combined normally through bridge.
Threshold value	Internal communication between main CPU and CDMA Modem chip fails
Diagnosis Time	The DTC is reported if the communication loss between main CPU and modem chip remained for 30 seconds at least.
Mil On Condition	Lamp Off

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.