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2014 - 2016 Corvette: Service Bulletin: Diagnostic Tip for Malfunction Indicator Light (MIL) Illuminated, DTC P0420 and P0430 Set

#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


2014 - 2016 Corvette - #16-NA-111: Diagnostic Tip for Malfunction Indicator Light (MIL) Illuminated, DTC P0420 and P0430 Set

2014 - 2016 Corvette - #16-NA-111: Diagnostic Tip for Malfunction Indicator Light (MIL) Illuminated, DTC P0420 and P0430 Set

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

2014 - 2016 Corvette - #16-NA-111: Diagnostic Tip for Malfunction Indicator Light (MIL) Illuminated, DTC P0420 and P0430 Set
    1. Inspect the all the air housing cover for any missing tabs and/or fasteners (1).
    2. Remove the air filter housing cover and inspect the seal around the air filter (2).
2014 - 2016 Corvette - #16-NA-111: Diagnostic Tip for Malfunction Indicator Light (MIL) Illuminated, DTC P0420 and P0430 Set
  1. Inspect the air filter sealing surface for signs of not contacting the air filter seal (1, 2).
  2. Inspect the air filter housing cover for dirt and/or debris bypassing the air filter (3).
  3. 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

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