2014 - 2019 Cadillac ATS-V - CTS V-Sport: Service Bulletin: #19-NA-256: Diagnostic Tips for Knocking, Rattle, Squeak and/or Squeal Type Noise from Engine


#19-NA-256: Diagnostic Tips for Knocking, Rattle, Squeak and/or Squeal Type Noise from Engine - Engine Replacement Recommendations for HFV6 Gen 1 and Gen 2 - (Jan 14, 2021)

Subject: Diagnostic Tips for Knocking, Rattle, Squeak and/or Squeal Type Noise from Engine – Engine Replacement Recommendations for HFV6 Gen 1 and Gen 2

This bulletin replaces PIP5216G. Please discard PIP5216G.


Brand:

Model:

Model Year:

VIN:

Engine:

Transmission:

from

to

from

to

Buick

Enclave

2008

2021

3.6L (LLT, LFY)

LaCrosse

2010

2019

3.0L (LF1, LFW)

3.6L (LLT, LFX, LGX)

Regal

2018

2020

3.6L (LGX)

Cadillac

ATS

2013

2019

3.6L (LFX, LGX)

ATS-V

2016

3.6L (LF4)

CT6

2016

2020

3.0L (LGW)

3.6L (LGX)

CTS

2007

2019

3.0L (LF1, LFW)

3.6L (LY7, LLT, LFX, LGX)

CTS V-Sport

2014

3.6L (LF3)

SRX

2007

2016

2.8L (LAU)

3.0L (LF1, LFW)

3.6L (LFX)

STS

2007

2011

3.6L (LY7, LLT)

XT5

2017

2021

3.6L (LGX)

XTS

2013

2019

3.6L (LF3, LFX)

Chevrolet

Camaro

2010

2021

3.6L (LLT, LFX, LGX)

Caprice PPV

2012

2013

3.6L (LFX)

Captiva Sport

2012

2015

3.6L (LFX)

Colorado

2015

2021

3.6L (LFX, LGZ)

Equinox

2008

2017

3.0L (LFW, LF1)

3.6L (LFX)

Impala VIN W

2012

2016

3.6L (LFX)

Impala VIN 1 (including Bi-fuel)

2014

2016

3.6L (LFR, LFX)

Impala

2017

2020

3.6L (LFX)

Malibu

2008

2012

3.6L (LY7)

Traverse

2009

2021

3.6L (LLT, LFY)

GMC

Acadia

2007

2021

3.6L (LY7, LLT, LGX)

Canyon

2015

3.6L (LFX, LGZ)

Terrain

2010

2017

3.0L (LF1, LFW)

3.6L (LFX)

Pontiac

G6

2008

2010

3.6L (LY7)

G8

2008

2009

3.0L (LF1, LFW)

3.6L (LY7, LLT)

Torrent

2008

3.0L (LFW)

3.6L (LLT)

Saturn

AURA

2007

2009

3.6L (LY7)

VUE

2008

2010

3.6L (LY7)

OUTLOOK

2007

3.6L (LY7, LLT)

 

Involved Region or Country

North America

Condition

Some customers may comment on one or more of the following conditions:

  • Knocking noise
  • Seized engine
  • Lower end squeak or squeal

Cause

This condition may be caused by a crankshaft main or rod bearing failure.

Correction

  1. Verify there is metal in the engine oil by removing the oil pan.
  2. Remove the main or rod bearing caps:
    • If the main and/or rod bearing are not the cause of the debris, refer to SI for further diagnostics.
#19-NA-256: Diagnostic Tips for Knocking, Rattle, Squeak and/or Squeal Type Noise from Engine
 


#19-NA-256: Diagnostic Tips for Knocking, Rattle, Squeak and/or Squeal Type Noise from Engine
 

  • If the main and/or rod bearings are found to be the cause of the debris, before deciding whether to replace the engine or repair it, refer to the Service Procedure below before making that determination.

Service Procedure


 


#19-NA-256: Diagnostic Tips for Knocking, Rattle, Squeak and/or Squeal Type Noise from Engine
 

    1. Inspect the oil control solenoids for metal debris. This shows the oil filter is in by-pass and unfiltered oil with bearing debris was pumped into the oil lubrication galleys, throughout the engine.
#19-NA-256: Diagnostic Tips for Knocking, Rattle, Squeak and/or Squeal Type Noise from Engine
 

    1. Inspect for damage to the cam caps journals and camshaft journals on the heads (obvious signs of metal through the cap).
#19-NA-256: Diagnostic Tips for Knocking, Rattle, Squeak and/or Squeal Type Noise from Engine
 


#19-NA-256: Diagnostic Tips for Knocking, Rattle, Squeak and/or Squeal Type Noise from Engine
 

  1. Inspect the timing chain idler sprockets for stiffness when turning (Should turn smooth and free).

Any of the above 3 instances would be cause to replace the engine instead of repair.

While engine replacement at this point will be necessary, additional inspections should also be made for conditions:

Important: If this is the case, then a call to the Technical Assistance Center (TAC) is NOT required prior to engine replacement.

If these conditions exist, warranty could be declined or feedback made on Warranty Parts Center (WPC) inspection. Maintenance documentation should be obtained in these instances for warranty validation.

Clearly document your findings on your repair order, fill out the cost worksheet, and call Product Quality Center (PQC) only if required for your dealer.

A repair and then replacement will usually be cause for additional inspection and scrutiny that could result in more questioning about the repair methods.

HFV6 engines are scheduled to be returned to the WPC for inspection to verify the concern, as well as the information provided in the repair order to support the engine replacement.

 

Version

2

Modified

Released November 13, 2019

January 14, 2021 – Added the 2021 Model Year to applicable Models.

Additional SI Keywords: PIP5216, PIP5216A, PIP5216B, PIP5216C, PIP5216D, PIP5216E, PIP5216F, PIP5216G, PIP5216H, PIP5216I, PIP5216J, PIP5216K, PIP5216L, PIP5216M



Article ID: 46
Created: January 15, 2021
Last Updated: January 15, 2021

Online URL: https://www.cadillacvnet.com/knowledge-base/article/2014-2019-cadillac-ats-v-cts-v-sport-service-bulletin-19-na-256-diagnostic-tips-for-knocking-rattle-squeak-and-or-squeal-type-noise-from-engine-46.html