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K5 GT
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Repair and Diagnosis
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Engine Performance
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System
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Engine Control System Diagnosis - 2.5L (15 Of 16)
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DTC U0121-00: 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
The ECM sets a DTC U012100 if it does not receive data from the HECU.