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2016 Cadillac ATS-V: Service Bulletin: Turbocharger Wastegate Brief Rattle or Tick When Revving

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#PI1234B: Turbocharger Wastegate Brief Rattle or Tick When Revving Engine in Park/Neutral - (May 12, 2017)


Subject:*Turbocharger Wastegate Brief Rattle or Tick When Revving Engine in Park/Neutral
Models:*2014-2016 Cadillac CTS Sedan (VIN A), XTS
Equipped with 3.6L, SIDI, DOHC, VVT, TWIN TURBO Engine – RPO LF3
2016 Cadillac ATS-V
Equipped with 3.6L, SIDI, DOHC, VVT, TWIN TURBO Engine – RPO LF4
Attention:*This PI also applies to any of the above models that may be Export from North America vehicles.

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This PI has been revised to add Recommendation/Instructions and Warranty information. Please discard PI1234A.


<dl>
<dt>Condition/Concern</dt>
<dd>
Some customers may comment on a brief rattle or tick when revving the engine when the vehicle is in P (Park) or N (Neutral). The same rattle or tick can sometimes be heard at the beginning or end of a vehicle acceleration while in D (Drive).

Some Service Technicians when performing a Pre-Delivery Inspection (PDI) may also notice this brief rattle or tick under the same conditions.

A Service Technician may determine that the source of the noise is the turbocharger (TC) wastegate.

</dd> <dt>Cause</dt>
<dd>
This condition may be caused by loose converter brackets nuts or a normal characteristic of the turbocharger (TC) wastegate.

</dd></dl><dl><dt>Recommendation/Instructions
</dt>
<dd>

Inspect the M8 nuts that secure the catalytic converters to the exhaust bracket. RPO LF3 (1) and RPO LF4 (2) as shown above. If the nuts are loose, it is necessary to replace them with new torque prevailing nuts.

If the technician finds that the nuts are torque correctly, DO NOT replace the turbocharger assembly in an effort to eliminate this brief rattle or tick.
</dd></dl> <dl>
<dt>Part Information
</dt><dd>

Description Part Number Qty
NUT, L/GATE HGE (BODY SI)115464412 for (RPO LF3) 5 for (RPO LF4)

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</dd>
</dl>
<dl><dt>Warranty Information</dt>
<dd>
For vehicles repaired under the Bumper-to-Bumper coverage (Canada Base Warranty coverage), use the following labor operation. Reference the Applicable Warranties section of Investigate Vehicle History (IVH) for coverage information.



Labor Operation Description Labor Time
4081818*Replacing the M8 Nuts, Catalytic Converter to the Exhaust Bracket0.3 hr

Add 0.1 hr (RPO LF4)
*This is a unique Labor Operation for Bulletin use only.

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