TSB PIC3226 (PDF)




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Document ID: 1562960

2005 Cadillac STS

Page 1 of 2

| STS (VIN D) Service Manual | Document ID: 1562960

#PIC3226: Exhaust Buzz Noise 2000 - 2200 RPM - 05
Cadillac STS - kw load LH2 3.6 4.6 LY7 moan rear
resonance vibration - (Nov 5, 2004)
Subject:

Exhaust Buzz Noise 2000 - 2200 RPM 2005 Cadillac STS

Models:

.

The following diagnosis might be helpful if the vehicle exhibits the symptom described in the PI.

Condition/Concern:
2005 MY Cadillac STSs with an LY7 V6 built prior to June 25, 2004 or an LH2 V8 built prior to
August 2, 2004, may exhibit a buzz type noise that can be heard from inside the vehicle during
driving conditions when the engine is between 2000 and 2200 RPM. The noise is most noticeable
when the vehicle is under a slight load at the above noted RPMs for an extended period of time.

Recommendation/Instructions:
The noise may be caused by the exhaust Resonator heat shield. Remove the exhaust resonator
shield and install a rear tunnel insulator P/N 15218128. The push-pin fasteners come with the
insulator.
.
Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited
is resolved without completing every step, the remaining steps do not need to be performed. If
these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance.

Models:
(05 Cadillac STS)
.

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.AllSee
© 2011 General
Motors
Corporation.
rightsyour
reserved.

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1/31/2011

Document ID: 1562960

Page 2 of 2

GM dealer for information on whether your vehicle may benefit from
the information.

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1/31/2011






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