16NA380

Service Bulletin
Bulletin No.:
16-NA-380
Date:
May, 2019
INFORMATION
Subject:
Brand:
Chevrolet
GMC
Holden
Diagnostic Tip for SES Lamp Illuminated, Excessive Smoke from Tail Pipe, DTC P2002,
P226D or P244A Set
Model:
Model Year:
VIN:
from
to
Express
2010
2019
Colorado
Models
2016
2019
Cruze
2017
2019
Equinox
2018
2019
Silverado
Models
2011
2019
Savana
2010
2019
Canyon
2016
2019
Sierra
Models
2011
2019
Terrain
2018
2019
Equinox
2018
2019
from
to
Engine:
Transmission:
1.6L, 2.0L,
2.8L, 3.0L or
6.6L Diesel
(LH7, LUZ,
LWN, LM2,
LGH, LML,
L5P, L5D)
Involved Region or Country
North America, Israel, South America, Australia, Middle East, SE Asia, South Korea and
Africa
Condition
Some customers may comment on the SES lamp illuminated and/or excessive smoke
coming from the tail pipe.
The technician may find DTC P2002, P226D or P244A set.
Information
• P2002 code will set if the properly functioning system detects a cracked or broken
DPF. The exhaust particulate sensor is used to diagnose this failure. This code sets
when the ECM detects that the particulate filter has degraded beyond a calibrated
threshold.
• P226D code will set if the properly functioning system detects that the DPF is missing.
The exhaust pressure differential sensor is used to diagnose this failure. This code
sets when the ECM detects that the pressure difference over the DPF is less than a
set threshold.
• P244A code will set if the exhaust pressure differential sensor lines are disconnected
or blocked. The code sets when the ECM detects the diesel particulate filter exhaust
differential pressure sensor is lower than the minimum threshold.
A properly functioning diesel particulate filter should remove most if not all soot particles
from the exhaust stream. The following test should NOT be performed immediately after a
regeneration because of the reduced filtration efficiency of the DPF without any soot in it.
The purpose of this test is to aid in diagnosing a DPF that has failed internally.
Copyright 2019 General Motors LLC. All Rights Reserved.
Page 2
May, 2019
Bulletin No.: 16-NA-380
Service Procedure
4622615
Note: Assistance may be required to perform the
exhaust soot flow test.
With assistance, the engine will need to rev to Wide
Open Throttle 3 consecutive times with a cheese cloth,
or equivalent, over the tail pipe.
• A failed exhaust soot flow test will show excessive
soot particulates on the cheese cloth or
equivalent. Refer to the graphic above.
• A passing exhaust soot flow test will show no, or
very minimal, signs of soot particulates.
If the vehicle set P2002, P226D or P244A and no other
codes, and SI diagnostics leads to DPF replacement,
use the cheese cloth test to confirm if the DPF needs to
be replaced.
Version
4
Modified
August 31, 2017 – Updated the Model Years.
July 23, 2018 – Added 2019 Model Year and additional vehicles.
May 07, 2019 – Updated the Subject and Condition for SES Lamp Illuminated and
additional DTCs, added Engine RPOs, Information section, updated Exhaust Test
procedure and removed Warranty Information.
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these
technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper
service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a
job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your
vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the
information.
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