17NA321

File in Section:
Bulletin No.:
Service Bulletin
Date:
17-NA-321
November, 2017
TECHNICAL
Subject:
Exhaust Smell and/or Leak with Possible Malfunction Indicator Lamp Illuminated
This Bulletin replaces PIP5419B. Please discard PIP5419B.
Brand:
Model:
Model Year:
from
VIN:
to
Cadillac
XTS
2013
2018
Chevrolet
Impala
2014
2018
from
to
SOP
Oct. 1, 2017
Engine:
Transmission:
LFX
All
Involved Region or Country
North America and Export Regions
Additional Options (RPOs)
Equipped with 6 Cylinder Engine (RPO LFX)
Condition
Some customers may comment on an exhaust smell and/or leak with possible
malfunction indicator lamp illuminated.
During diagnosis, a technician may find DTC P0430 and/or P0420.
Cause
This may be due to a crack around the catalytic mounting flange.
Correction
Replace converter assembly with new service part.
Service Procedure
Korea Only Parts Information
If you encounter a vehicle with the above concern,
visually inspect the catalytic converter for cracks.
• If cracks are visually noticed, replace the affected
catalytic converter. Refer to Three-Way Catalytic
Converter Replacement in SI.
• If no cracks can be found on the catalytic
converter, continue normal diagnosis referring
to SI.
Causal
Part
Description
Part
Number
Side
X
CONVERTER
ASM-3 WAY
CTLTC (W/
EXH PIPE)
20929196
Right
X
CONVERTER
ASM-3 WAY
CTLTC (W/
EXH PIPE)
84216836
Left
North America and Export Regions
(Except Korea) Parts Information
Causal
Part
Description
Part
Number
Side
X
CONVERTER
ASM-3 WAY
CTLTC (W/
EXH PIPE)
84216838
Right
CONVERTER
ASM-3 WAY
CTLTC (W/
EXH PIPE)
84216836
X
Copyright 2017 General Motors LLC. All Rights Reserved.
Warranty Information
For vehicles repaired under warranty, use:
Left
Labor
Operation
Description
Labor Time
4050940
Three-Way Catalytic
Converter Replacement
Use
Published
Labor
Operation
Time
Page 2
November, 2017
Bulletin No.: 17-NA-321
Version
2
Modified
November 14, 2017 – Added Korea Only Parts 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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