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Hummer
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2007
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H2 4D Utility Pickup
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Repair and Diagnosis
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Brakes
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Traction Control
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Antilock Brake System With TCS
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Diagnostic Information and Procedures
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DTC C0121
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DTC Descriptor
DTC Descriptor
This diagnostic procedure supports the following DTCs:
DTC C0121 Valve Relay Circuit Malfunction