19NA256
Service Bulletin Details
Public Details for: 19NA256
This service bulletin provides diagnostic aid information/procedures to perform inspections to determine if the engine needs to be replaced as opposed to just internal parts for knocking, rattle, squeak and/or squeal type noises from engine
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2021 BUICK ENCLAVE |
2021 CADILLAC CT5 |
2021 CADILLAC XT5 |
2021 CADILLAC XT6 |
2021 CHEVROLET BLAZER |
2021 CHEVROLET CAMARO |
2021 CHEVROLET COLORADO |
2021 CHEVROLET TRAVERSE |
2021 GMC ACADIA |
2021 GMC CANYON |
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2007 CADILLAC CTS |
2007 CADILLAC SRX |
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Bulletin No.: Service Bulletin Date: 19-NA-256 August, 2021 INFORMATION 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: Enclave Buick Model Year: VIN: from to 2008 2022 3.6L (LLT, LFY) 3.0L (LF1, LFW) 3.6L (LLT, LFX, LGX) LaCrosse 2010 2019 Regal 2018 2020 3.6L (LGX) ATS 2013 2019 3.6L (LFX, LGX) ATS-V 2016 CT4 2022 2022 3.6L (LF4) CT5 2020 2022 3.0L (LGY) CT6 2016 2020 3.0L (LGW) 3.6L (LGX) CTS 2007 Cadillac CTS V-Sport — to Engine: from — — 3.6L (LF4) 2019 — — 3.0L (LF1, LFW) 3.6L (LY7, LLT, LFX, LGX) 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 2022 3.6L (LGX) XT6 2020 2022 3.6L (LGX) XTS 2013 2019 3.6L (LF3, LFX) Copyright 2021 General Motors LLC. All Rights Reserved. Transmission: — Page 2 Brand: Chevrolet August, 2021 Model: Model Year: Bulletin No.: 19-NA-256 VIN: from to Blazer 2019 2022 3.6L (LGX) Camaro 2010 2022 3.6L (LLT, LFX, LGX) Caprice PPV 2012 2013 3.6L (LFX) Captiva Sport 2012 2015 3.6L (LFX) Colorado 2015 2022 3.6L (LFX, LGZ) Equinox 2008 2017 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 2022 3.6L (LLT, LFY) Acadia 2007 Canyon 2015 — to — Pontiac Saturn 3.0L (LFW, LF1) 3.6L (LFX) — — 3.6L (LFX, LGZ) Terrain 2010 2017 3.0L (LF1, LFW) 3.6L (LFX) G6 2008 2010 3.6L (LY7) G8 2008 2009 3.0L (LF1, LFW) 3.6L (LY7, LLT) Torrent 2008 AURA 2007 VUE 2008 OUTLOOK 2007 Transmission: — 3.6L (LY7, LLT, LGX) 2022 GMC Engine: from — — — — 3.0L (LFW) 3.6L (LLT) 2009 2010 3.6L (LY7) — — 3.6L (LY7) 3.6L (LY7, LLT) Involved Region or Country North America, Middle East 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. — Bulletin No.: 19-NA-256 August, 2021 Page 3 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. Correction 3961446 3961447 • 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. Page 4 August, 2021 Bulletin No.: 19-NA-256 Service Procedure 3966789 3961448 2. Inspect for damage to the cam caps journals and camshaft journals on the heads (obvious signs of metal through the cap). 3961450 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. 3961451 Bulletin No.: 19-NA-256 August, 2021 3961452 3. Inspect the timing chain idler sprockets for stiffness when turning (Should turn smooth and free). Page 5 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: – Sludging caused by lack of maintenance. Refer to Service Bulletin# 16-NA-222. – Global oil starvation caused by running the engine very low on oil. – Intentional abuse to the engine. 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 4 Modified Released November 13, 2019 January 14, 2021 – Added the 2021 Model Year to applicable Models. May 24, 2021 – Added the Blazer and CT5 models. August 20, 2021 – Added 2020-2022 XT6 (RPO LGX), 2022 CT4 (RPO LF4), 2022 Model Year to Enclave, CT5, XT5, Blazer, Camaro, Colorado, Traverse, Acadia and Canyon and added Middle East to Involved Region or Country section. Additional SI Keywords: PIP5216, PIP5216A, PIP5216B, PIP5216C, PIP5216D, PIP5216E, PIP5216F, PIP5216G, PIP5216H, PIP5216I, PIP5216J, PIP5216K, PIP5216L, PIP5216M 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. WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION