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    Default 2016 Cadillac CTS-V: Service Bulletin: Diagnostic Tip for Malfunction Indicator Light (MIL)

    #16-NA-111: Diagnostic Tip for Malfunction Indicator Light (MIL) Illuminated, DTC P0420 and P0430 Set - (Jun 8, 2016)

    Subject:* Diagnostic Tip for Malfunction Indicator Light (MIL) Illuminated, DTC P0420 and P0430 Set
    Attention:* This Bulletin also applies to any of the models that may be Export from North America vehicles.



    Brand: Model: Model Year: VIN: Engine: Transmission:
    from to from to
    Cadillac CTS 2016 2016 LT1, LT4
    Escalade 2015 2016 L83, L86
    Escalade ESV 2015 2016
    Chevrolet Camaro 2016 2016 LT1, LT4
    Corvette 2014 2016
    Silverado 2014 2016 L83, L86, LV1, LV3
    GMC Sierra 2014 2016 L83, L86, LV1, LV3
    Yukon 2015 2016 L83, L86
    Yukon Denali 2015 2016
    Yukon XL 2015 2016
    Yukon XL Denali 2015 2016


    Condition Some customers may comment that the Malfunction Indicator Light (MIL) is illuminated.

    Technician may find DTC PO420 and P0430 set.
    Cause 2016 Cadillac CTS-V: Service Bulletin: Diagnostic Tip for Malfunction Indicator Light (MIL)-2014-2016-corvette-malfunction-indicator-1-jpg



    2016 Cadillac CTS-V: Service Bulletin: Diagnostic Tip for Malfunction Indicator Light (MIL)-2014-2016-corvette-malfunction-indicator-2-jpg

    This may be caused by excessive sand and/or debris entering the air filter box and bypassing the seal of the air filter, due to not properly sealing, causing damage to the HO2 sensor element (3) and the catalytic converter to become blocked with sand and debris particles (1, 2).


    Correction


    Do not replace any of the parts until the air filter housing has been validated to be completely sealed.

    If the condition is evident, inspection of the air box and air filter seal must be done.

    Follow the Service Procedure steps in order to verify the sealing of the air filter to housing surface.

    After validating the air box has been sealed, repair the P0420 and the P0430 codes as needed.

    Service Procedure



    1. 2016 Cadillac CTS-V: Service Bulletin: Diagnostic Tip for Malfunction Indicator Light (MIL)-2014-2016-corvette-malfunction-indicator-3-jpg
    2. Inspect the all the air housing cover for any missing tabs and/or fasteners (1).
    3. Remove the air filter housing cover and inspect the seal around the air filter (2).
      2016 Cadillac CTS-V: Service Bulletin: Diagnostic Tip for Malfunction Indicator Light (MIL)-2014-2016-corvette-malfunction-indicator-5-jpg
    4. Inspect the air filter sealing surface for signs of not contacting the air filter seal (1, 2).
    5. Inspect the air filter housing cover for dirt and/or debris bypassing the air filter (3).
    6. Inspect the air cleaner outlet duct for any dirt and/or debris.


    • If dirt and debris has been found bypassing the air filter due to a faulty seal, replace the air filter as necessary.
    • If the air filter housing has been found not properly sealing, refer to the Air Cleaner Assembly Replacement in SI.


    Warranty Information

    For vehicles repaired under warranty, use:


    Labor Operation Description Labor Time
    4020470 Air Cleaner Element Replacement Use Published Labor Operation Time
    4020390 Air Cleaner Assembly Replacement


    Version 2
    Modified May 31, 2016 – Added repair as needed for codes P0420, P0430 in Correction.

    GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer".* They are written to inform these technicians of
    Attached Thumbnails Attached Thumbnails 2016 Cadillac CTS-V: Service Bulletin: Diagnostic Tip for Malfunction Indicator Light (MIL)-2014-2016-corvette-malfunction-indicator-1-jpg   2016 Cadillac CTS-V: Service Bulletin: Diagnostic Tip for Malfunction Indicator Light (MIL)-2014-2016-corvette-malfunction-indicator-2-jpg   2016 Cadillac CTS-V: Service Bulletin: Diagnostic Tip for Malfunction Indicator Light (MIL)-2014-2016-corvette-malfunction-indicator-3-jpg   2016 Cadillac CTS-V: Service Bulletin: Diagnostic Tip for Malfunction Indicator Light (MIL)-2014-2016-corvette-malfunction-indicator-5-jpg  
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