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2002
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Blazer 4D Utility, 4WD, Part Time
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Repair and Diagnosis
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Electrical
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Charging Systems
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Charging System
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Diagnostic Tests
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DTC P0621: High Or Low Generator Turn On Signal
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Conditions For Clearing DTC
Conditions For Clearing DTC
The Conditions for Setting the DTC are no longer present.
A history DTC will clear after 40 malfunction free ignition cycles.
The Powertrain Control Module (PCM) receives the clear code command from the scan tool.