070604025M

Service Bulletin
Bulletin No.:
Date:
07-06-04-025M
June, 2020
INFORMATION
Subject:
Information on Clicking/Ticking Sound/Noise Heard During Cold Start
Models:
2009-2020 Buick Enclave
2010-2019 Buick LaCrosse
2018-2020 Buick Regal
2008-2011 Cadillac STS
2008-2017 Cadillac CTS
2010-2016 Cadillac SRX
2013-2019 Cadillac ATS, XTS
2017-2020 Cadillac CT6, XT5
2020-2020 Cadillac CT5, XT6
2009-2020 Chevrolet Traverse
2010-2018 Chevrolet Captiva, Equinox
2010-2020 Chevrolet Camaro
2011-2017 Chevrolet Caprice PPV
2012-2017 Chevrolet Impala Limited
2014-2020 Chevrolet Impala
2015-2020 Chevrolet Colorado
2018-2020 Chevrolet Blazer
2009-2020 GMC Acadia
2010-2017 GMC Terrain
2015-2020 GMC Canyon
2009-2010 Saturn OUTLOOK
Equipped with 3.0L or 3.6L VVT Direct Injection V6 Engine (RPOs LF1, LF3, LF4, LFW,
LFY, LGY, LLT, LFX, LGW, LGX or LGZ)
Attention: This bulletin also applies to any of the above models that may be Export from North
America vehicles.
This bulletin has been revised to add the 2018-2020 Model Years, Models and RPOs. Please
discard Corporate Bulletin Number 07-06-04-025L.
Copyright 2020 General Motors LLC. All Rights Reserved.
Page 2
June, 2020
Do This
Don't Do This
Inform the customer that this
is normal operation of the
high pressure fuel pump and
injectors.
DO NOT replace the high
pressure fuel pump and/or
injectors.
The 3.0L and 3.6L SIDI engines use a direct injection
fuel system that operates at very high fuel pressures. A
direct injection fuel system produces a rapid clicking
and ticking sound that can be heard from the engine
compartment. The sound is more evident when outside
around the vehicle or when the hood is open. The
sound is more noticeable during idle and is more
frequent during a cold start, but lessens once the
engine is warm.
Bulletin No.: 07-06-04-025M
The rapid ticking noise on cold start up is the fuel pump
(located on the rear of the left cylinder head) building up
high fuel pressure. When the engine warm-up is
completed, the high pressure fuel pump will continue to
tick at a lower rate of approximately one tick per second
during idle. The clicking sound is the fuel injectors
pulsing on and off under higher fuel pressures. This
sound is a normal characteristic of Direct Injection Fuel
high pressure fuel system.
DO NOT attempt to repair or replace any parts for this
kind of clicking or ticking noise concern. The clicking or
ticking sound is not indicative of any concerns with the
engine or the vehicle. You may wish to give the
customer a copy of this bulletin.
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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