16-NA-380

Bulletin No.: 16-NA-380
Date: Aug-2017
Subject:
Brand:
Chevrolet
Diagnostic Tip for Excessive Smoke from Tail Pipe, DTC P2002 Set
Model:
Model Year:
VIN:
from
to
Express
2010
2018
Colorado
2011
2018
Savana
2010
2018
Canyon
2011
2018
from
Engine:
Transmission:
to
Diesel Engine
(LGH, LML, LUZ,
LWN, L5P, LH7)
Cruze
Silverado
GMC
Sierra
Involved Region or Country
North America and Israel
Condition
Some customers may comment about excessive smoke coming from the tail pipe.
The Technician may find:
•
DTC P2002 set.
•
Cracked or broken Diesel Particulate Filter (DPF).
Correction
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.
Service Procedure
1
Note: Assistance may be required to perform exhaust soot flow test.
With assistance, the engine will need to rev to Wide Open Throttle 3 consecutive times while using a cheese cloth or equivalent, over the tail pipe.
•
A failed DPF has excessive soot particulates on the cheese cloth or equivalent. Refer to the graphic.
•
A DPF that is working properly should show no or very minimal signs of soot particulates.
If the DPF has been found to be the cause of the heavy soot. Replace the DPF. Refer to Exhaust Particulate Filter Replacement in SI.
If the DPF has been found not to be cause of the heavy soot, refer to SI for further diagnostic testing.
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation
Description
Labor Time
4050860
Exhaust Particulate Filter Replacement
Use Published Labor Operation
Time
Version
2
Modified
August 31, 2017 — Updated Model Years.
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.
WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION
2