060601010D

File in Section:
Service Bulletin
06 - Engine
Bulletin No.:
06-06-01-010D
Date:
February, 2018
INFORMATION
Subject:
Information on Close-Coupled Converter and Engine Replacement
Models:
2019 and Prior GM Passenger Cars and Trucks
with Close-Coupled Catalytic Converters
Attention: This Bulletin also applies to any of the above models that may be Export vehicles.
This Bulletin has been revised to add the 2017-2019 Model Years. Please discard Corporate
Bulletin Number 06-06-01-010C.
Certain 2019 and prior General Motors products may
be equipped with a new style of catalytic converter,
technically known as the close-coupled catalytic
converter, providing quick catalyst warm-up, resulting in
lower tail pipe emissions earlier in the vehicle operating
cycle.
If an engine breakdown or non-function were to occur
(such as broken intake/exhaust valve or piston), debris
may be deposited in the converter through engine
exhaust ports. If the engine is non-functioning due to a
severe overheat event, damage to the ceramic “brick”
internal to the catalytic converter may occur. This may
result in ceramic debris being drawn into the engine
through the cylinder head exhaust ports.
If a replacement engine is installed in either of these
instances, the replacement engine may fail due to the
debris being introduced into the combustion chambers
when started.
When replacing an engine for a breakdown or
non-function, an inspection of the catalytic converters
and ALL transferred components (such as exhaust/
intake manifolds) should be performed. Any debris
found should be removed. In cases of engine failure
due to severe overheat, dealers should also inspect
each catalytic converter for signs of melting or cracking
of the ceramic “brick.” If damage is observed, the
converter should be replaced.
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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