Bulletin Information

Bulletin Title: #22-NA-168 - Diagnostic Tip for Checking Exhaust System for Leaks, Malfunction Indicator Lamp (MIL) Illuminated - DTC P2C7A and/or P0421 Set - (Mar 30, 2023)
Bulletin Type: Information
Applies To: Vehicle DTC Information / Displays and Gauges / Exhaust

Applicable Vehicles

2023 GMC Yukon XL - 4WD
2023 GMC Yukon XL - 2WD
2023 GMC Yukon - 4WD
2023 GMC Yukon - 2WD
2023 Chevrolet Tahoe - 4WD
2023 Chevrolet Tahoe - 2WD
2023 Chevrolet Suburban - 4WD
2023 Chevrolet Suburban - 2WD
2023 Cadillac Escalade ESV - 4WD
2023 Cadillac Escalade ESV - 2WD
2023 Cadillac Escalade - 4WD
2023 Cadillac Escalade - 2WD
2022 GMC Yukon XL - 4WD
2022 GMC Yukon XL - 2WD
2022 GMC Yukon - 4WD
2022 GMC Yukon - 2WD
2022 GMC Sierra 1500 - 4WD New (RPO J22, VIN Digit 5 = U)
2022 GMC Sierra 1500 - 4WD Limited (RPO J21, VIN Digit 5 = 9)
2022 GMC Sierra 1500 - 2WD New (RPO J22, VIN Digit 5 = H)
2022 GMC Sierra 1500 - 2WD Limited (RPO J21, VIN Digit 5 = 8)
2022 Chevrolet Tahoe - 4WD
2022 Chevrolet Tahoe - 2WD
2022 Chevrolet Suburban - 4WD
2022 Chevrolet Suburban - 2WD
2022 Chevrolet Silverado 1500 - 4WD New (RPO J22, VIN Digit 5 = D)
2022 Chevrolet Silverado 1500 - 4WD LTD (RPO J21, VIN Digit 5 = Y)
2022 Chevrolet Silverado 1500 - 2WD New (RPO J22, VIN Digit 5 = A)
2022 Chevrolet Silverado 1500 - 2WD LTD (RPO J21, VIN Digit 5 = W)
2022 Cadillac Escalade ESV - 4WD
2022 Cadillac Escalade ESV - 2WD
2022 Cadillac Escalade - 4WD
2022 Cadillac Escalade - 2WD
2021 GMC Yukon XL - 4WD
2021 GMC Yukon XL - 2WD
2021 GMC Yukon - 4WD
2021 GMC Yukon - 2WD
2021 GMC Sierra 1500 - 4WD
2021 GMC Sierra 1500 - 2WD
2021 Chevrolet Tahoe - 4WD
2021 Chevrolet Tahoe - 2WD
2021 Chevrolet Suburban - 4WD
2021 Chevrolet Suburban - 2WD
2021 Chevrolet Silverado 1500 - 4WD
2021 Chevrolet Silverado 1500 - 2WD
2021 Cadillac Escalade ESV - 4WD
2021 Cadillac Escalade ESV - 2WD
2021 Cadillac Escalade - 4WD
2021 Cadillac Escalade - 2WD
2020 GMC Sierra 1500 - 4WD
2020 GMC Sierra 1500 - 2WD
2020 Chevrolet Silverado 1500 - 4WD
2020 Chevrolet Silverado 1500 - 2WD

#22-NA-168 - Diagnostic Tip for Checking Exhaust System for Leaks, Malfunction Indicator Lamp (MIL) Illuminated - DTC P2C7A and/or P0421 Set - (Mar 30, 2023)

Subject:
Diagnostic Tip for Checking Exhaust System for Leaks for the LM2 Engines, Malfunction Indicator Lamp (MIL) Illuminated - DTC P11D5, P14D9, P20EE, P2C7A, P0421 and/or P0402 Set

Brand:

Model:

Model Year:

VIN:

Engine:

Transmission:

from

to

from

to

Cadillac

Escalad...

Attention!

To view the rest of this document requires a subscription. Subscriptions start at only $5.00. Click the button below to view the subscription options and to sign up.

Subscribe

Document Tags

Document Title: #22-NA-168 - Diagnostic Tip for Checking Exhaust System for Leaks, Malfunction Indicator Lamp (MIL) Illuminated - DTC P2C7A and/or P0421 Set - (Mar 30, 2023)

diagnostic

exhaust

system

engine

silverado

digit

sierra

condition

important

normal

valve

nitrogen

oxides

sensor

catalytic

converter

efficiency

leak

smoke

test

area

tested

exiting

pressure

soapy

water

bubbles

over

using

laws

turbocharger

shaft

click

size

filter

sealed

adapter

examples

concern

section

revised

added

exhaust leak

smoke leak

leak test

pressure leak

leak areas

size click

sensor exceeded minimum

exceeded minimum learning

minimum learning limit

nitrogen oxides catalytic

oxides catalytic converter

converter efficiency threshold

smoke leak test

pressure leak test

using smoke leak

leak test smoke

using pressure leak

soapy water mixture

examples exhaust leak

exhaust leak areas

leak areas concern

click size click

size click size

examples normal exhaust

normal exhaust leak

click size normal

shaft seal leakage

revised march added