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Hummer
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2008
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H2 4D Utility Wagon
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Repair and Diagnosis
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Engine Performance
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Testing & Diagnosis
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Engine Controls And Fuel - 6.2L - DTC P1255 To DTC P2635
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DTC P1258
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Conditions for Setting the DTC
Conditions for Setting the DTC
Coolant temperature more than 132°C (270°F) for greater than 10 seconds.