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Home >> Chevrolet >> 2006 >> Impala SS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 5.3L - DTC P0449 To DTC P1516 >> DTC P0556 >> Conditions for Setting the DTC

Conditions for Setting the DTC

The ECM detects brake booster vacuum as being less than the intake manifold vacuum for more than 100 milliseconds.

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