Repeat DTC P0411 - kw 3.0 driveability EVAP L81 MIL

When servicing the vehicle with the VIN you entered, the following diagnosis might be helpful if the vehicle exhibits the described symptoms.

1999 - 2001 3.0 L81 VB Repeat DTC P0411 AIR system no flow detected

The ECM turns on the secondary air pump solenoid valve by providing a ground path. This allows the manifold vacuum to move the cut off valve to the open position. The ECM monitors the secondary air injection system and takes diagnostic action when the calibrated time required for the two catalytic converters and four oxygen sensors to reach normal operating temperatures was not achieved (Mountain States Only) due to elevation. There should be no further repair attempts due to this concern is under investigation by GM Powertrain.

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Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance. This diagnostic approach was developed for the vehicle with the VIN you entered and should not be automatically be used for other vehicles with similar symptoms.

(99, 00, 01 Cadillac Catera)

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