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Home >> Chevrolet >> 2009 >> Uplander Base, 3.9 1 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 3.9L - DTC P0341 To DTC P2544 >> DTC P0420 >> Repair Procedures

Repair Procedures

NOTE: A new converter with less than 100 miles on it may set DTC P0420 due to out-gassing of the internal matting. Operating the vehicle at highway speeds for approximately 1 hour may correct the condition.
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