GM Service Manual Online
For 1990-2009 cars only

System

DTCs Required to Set System Status to YES

If an I/M System Status indicator did NOT update to YES during the Inspection/Maintenance (I/M) Complete System Set Procedure , review each indicator and reference this table to determine each DTC associated with the I/M System Status Indicator. Each DTC listed below has specific conditions that must be met for the diagnostic to run. Included within the conditions are additional DTCs which, if set, may inhibit the DTCs listed below from running. Reviewing and operating the vehicle within the Conditions for Running for each DTC listed below will allow the I/M System Status Indicators to transition to YES.

Catalyst Monitor

DTC P0420

Evaporative Emission (EVAP)

    •  DTC P0442
    •  DTC P0446
    •  DTC P0455
    •  DTC P0496

Oxygen Sensor

    •  DTC P0140
    •  DTC P1133
    •  DTC P2A01

Oxygen Sensor Heater

    •  DTC P0135
    •  DTC P0141

Exhaust Gas Recirculation (EGR)

    •  DTC P0401
    •  DTC P0403
    •  DTC P0404
    •  DTC P0405
    •  DTC P0406
    •  DTC P1404

Secondary AIR

(L26, NU3 only)

    •  DTC P0411 (L26, NU3 only)
    •  DTC P0412 (L26, NU3 only)
    •  DTC P0420 (L26, NU3 only)
    •  DTC P2430 (L26, NU3 only)
    •  DTC P2431 (L26, NU3 only)
    •  DTC P2432 (L26, NU3 only)
    •  DTC P2433 (L26, NU3 only)
    •  DTC P2440 (L26, NU3 only)
    •  DTC P2444 (L26, NU3 only)