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Chevrolet
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2002
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Avalanche 2500, RWD
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Repair and Diagnosis
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Engine Performance
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System
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Engine Controls - Self-Diagnostics - 8.1L
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Diagnostic Tests
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DTC P1518: TAC Module Serial Data Fault
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Conditions For Running DTC
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Conditions For Running DTC
DTC P1517 is not set.
The ignition switch is in the crank or run position.
The ignition voltage is greater than 5.23 volts.