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Hyundai
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2017
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Tucson Value, 4WD
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Repair and Diagnosis (Single Page)
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Transmission
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Transfer Case
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4WD Control System Diagnosis
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DTC U0121: Lost Communication With Anti-Lock Brake System (ABS) Control Module
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DTC Information
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DTC Description
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DTC Description
If the 4WD ECU doesn't get some ESP/ESC/VDC signals from ESP/ESC/VDC module, it sets U0121.