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Engine Control System & Fuel System - 5.3L - DTC P0420 To DTC P3449
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DTC P0442
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Conditions for Setting the DTC
Conditions for Setting the DTC
The ECM detects a leak in the EVAP system that is greater than a calibrated amount.
The ECM must complete several EONV tests before the diagnostic can turn the MIL on or off.