NHTSA ID Number: 10246483
Manufacturer Communication Number: 19-NA-256
TSB/Document Date: 2023-12-09
Summary
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.
If the PDF is very large, it may not load in the preview below.
Some older TSBs had multiple PDFs — visit the NHTSA Website to view all PDFs.
If the TSB PDF does not show, download or view it on the NHTSA Website.
Click on the (+) Plus Sign
Then Click on Associated Document(s)
- MaxLife Technology prevents engine breakdown with 40% better...
- Includes seal conditioners to reduce oil consumption and oil...
- Added detergents reduce sludge, corrosion, rust and deposits...
- Advanced friction-fighting additives help maximize...
- Meets or exceeds all requirements of ILSAC GF-6A, API SP...
This product presentation was made with AAWP plugin.
Search NHTSA Database for Recalls
Search NHTSA Database for Vehicle Investigations
View Latest Vehicle Investigations
Search NHTSA Database for Vehicle Complaints
View Latest Vehicle Complaints
TSB/Document ID: 19-NA-256
Replacement Service Bulletin Number:
MFR Communication Date: 2023-11-29
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE AND ENGINE COOLING
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
Bulletin No.:
Service Bulletin
Date:
19-NA-256
December, 2023
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:
Model Year:
VIN:
to
Enclave
2008
2024
LaCrosse
2010
2019
Regal
2018
2020
ATS
2013
ATS-V
2016
CT4
2022
2024
3.6L (LF4)
CT5
2020
2024
3.0L (LGY)
CT6
2016
2020
3.0L (LGW)
3.6L (LGX)
CTS
2007
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
2024
3.6L (LGX)
from
to
Engine:
from
3.6L (LLT, LFY)
—
—
3.0L (LF1, LFW)
3.6L (LLT,
LFX, LGX)
3.6L (LGX)
3.6L (LF4)
—
—
3.0L (LF1, LFW)
3.6L (LY7, LLT,
LFX, LGX)
XT6
2020
2024
3.6L (LGX)
XTS
2013
2019
3.6L (LF3, LFX)
Copyright 2023 General Motors
LLC. All Rights Reserved.
—
3.6L (LFX, LGX)
2019
2019
—
Page 2
Brand:
December, 2023
Model:
Model Year:
Bulletin No.: 19-NA-256
VIN:
from
to
Blazer
2019
2024
3.6L (LGX)
Camaro
2010
2024
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)
—
to
Engine:
from
—
3.0L (LFW, LF1)
3.6L (LFX)
Impala
2017
2020
3.6L (LFX)
Malibu
2008
2012
3.6L (LY7)
Traverse
2009
2024
3.6L (LLT, LFY)
Acadia
2007
2024
3.6L (LY7,
LLT, LGX)
Canyon
2015
2022
Terrain
2010
2017
3.0L (LF1, LFW)
3.6L (LFX)
G6
2008
2010
3.6L (LY7)
G8
2008
2009
Torrent
2008
AURA
2007
VUE
2008
OUTLOOK
2007
—
—
—
—
3.6L (LFX, LGZ)
3.0L (LF1, LFW)
3.6L (LY7, LLT)
—
—
—
3.0L (LFW)
3.6L (LLT)
2009
2010
3.6L (LY7)
—
—
3.6L (LY7)
3.6L (LY7, LLT)
Involved Region or Country
North America, Europe, 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
December, 2023
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
December, 2023
Bulletin No.: 19-NA-256
Important: Service agents must comply with all
International, Federal, State, Provincial, and/or
Local laws applicable to the activities it performs
under this bulletin, including but not limited to
handling, deploying, preparing, classifying,
packaging, marking, labeling, and shipping
dangerous goods. In the event of a conflict between
the procedures set forth in this bulletin and the
laws that apply to your dealership, you must follow
those applicable laws.
Service Procedure
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.
3961448
3966789
2. Inspect for damage to the cam caps journals and
camshaft journals on the heads (obvious signs of
metal through the cap).
Bulletin No.: 19-NA-256
December, 2023
Page 5
3. Inspect the timing chain idler sprockets for stiffness
when turning (Should turn smooth and free).
3961451
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.
3961452
Version
6
Modified
Released November 13, 2019
Revised January 14, 2021 – Added the 2021 Model Year to applicable Models.
Revised May 24, 2021 – Added the Blazer and CT5 models.
Revised 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.
Revised March 15, 2023 – Added the 2023 Model Year to applicable vehicles and Europe
to the Involved Region or Country section.
Revised November 29, 2023 – Added the 2024 Model Year to applicable vehicles.
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
- OBD2 Bluetooth Scanner Lifetime Update: Ediag Elite offers revolutionary Advantage Lifetime Updates with unlimited access to the superior 15+ reset service, bidirectional testing and full system diagnostics.The Ediag Elite is an excellent Bluetooth OBD2 scanner diagnostic tool ideal for DIY's and private car owners.
- Bidirectional Test for Quickly Locating Problems: The Bidirectional Scan tool allows you to send commands directly from your smartphone to your vehicle for active testing. This feature helps to quickly narrow down problems such as air conditioning clutches, windows, doors, sunroofs, etc., reducing diagnostic time for mechanics and helping DIY users locate faults more easily. In addition, Ediag Elite provides fault analysis and repair guidance to help you solve problems efficiently.
- 15+ Maintenance Resets: The current version introduces 15+ popular special features: Oil Reset, Headlight Matching, Bleeding Reset, TPMS Reset, BMS Reset, Gear Box Relearn, Throttle Learning, Injector Coding, SAS Reset and more special functions in system diagnose menu. These functions make it easy for owners to carry out the necessary maintenance and servicing, ensuring that your vehicle stays in top condition, prolonging its service life and preventing common problems and breakdowns. Note: The Special function vary by model& year, Reach us check compatibility.
- Wide Compatibility CANFD & FCA
Autoauth: Compatible with GM, Ford, Toyota, Chrysler, Honda, Mazda, Nissan, Mitsubishi, Hyundai, KIA with standard OBD2 port from 1996 to newer. More car brands and features will be released gradually. Newest Ediag Elite scanner supports CANFD Protocol and FCA cars. Note: Coverage may vary on different vehicle by model& year ,Please contact us to confirm compatibility before purchase. - Perfect for Monitoring The Health of Your Vehicle: Ediag Elite is designed to make vehicle maintenance simple and efficient. With intelligent Auto VIN quick recognition, it is easy to connect to your car without the need for manual input. Real-time data is visualized in a variety of formats, including graphs, numeric, meter displays and clear 4-in-1 data charts, allowing you to effortlessly monitor real-time data. Data logging/reporting is available for playback and further analysis
- No Annual Fees & 2026 Upgraded CAN FD: Why pay $199/year or more for updates? The 2026 newest Kingbolen K7 obd2 scanner features have been upgraded to Lifetime Updates without subscription fees, saving you significant costs in the long run. K7 scan tool also adds the CAN FD protocol for the latest GM models (2019+), enabling faster data transfer, reducing the risk of undetected errors
- 2026 Newest Top-tier Car Scanner: Kingbolen K7 diagnostic scan tool is equipped with most capabilities for daily repair/maintenance: Wireless diagnosis via Bluetooth, Bidirectional Test, ECU Online/Offline Code, 31+ Resets, PMI for Ford, Lincoln, Mazda, Global version for 100+ brand vehicles and 17 languages, no area limit, FCA AutoAuth
- OE-Level Full Systems Scan Tool: K7 professional diagnostic scanner with Auto Vin can do one-click to scan ECUs on most of vehicles, like pcm, ecm, eps, bcm, tpms, sas, a/c system... to read/clear code, view live data, freeze frame, read ecu info. 4-in-1 data stream graphics can make data viewing more intuitive. Detailed diagnostic reports will help you easily master the car situation as it can be shared by bluetooth or email! Adding workshop information can help your customers to know more
- Bidirectional Test/Active Test & ECU Code: Stop guessing and start fixing. Bidirectional scan tool Kingbolen K7 can perform real active test that can send commands to the vehicle's ECU to drive the actuators to work, like window, rear mirrors, sunroof, door, solenoids, wipers, headlamp, etc, helping you quickly find out bad parts and pinpoint faulty issues. K7 bidirectional scanner will be a good choice to save money and time on car repairs when performing complex maintenance and repair
- 31 Reset Functions: Avoid expensive dealership visits for simple services. Experience tells us that just a small repair service may cost a lot of money. Kingbolen K7 is a professional diagnostic scanner with 31 common maintenance services like Oil /SAS/EPB/TPMS Reset, Battery Matching, ABS Bleeding, Injector Code, etc. It effectively handles most of the car reset and relearning jobs, perfect for experienced DIYers and mechanics. Note: Functions in the menu vary across vehicles. Kindly check the compatibility before purchase
- WHY S608 STANDS OUT:2026 Kingbolen S608 is the only scanner <200 bucks that offers powerful active tests on Engine, ABS, SRS, and Transmission systems. Offers 9 resets,Covers 110+ global brands with a 6.2'' larger touchscreen
- KINGBOLEN'S NEW BIDIRECTIONAL SCAN TOOL: As the 2026 upgraded version of S600, our Newest S608 obd2 scanner has the powerful Bi-directional Control on Engine, ABS, SRS, and Transmission systems. It can send commands to the ECUs of actuators for functional tests and work status checks, such as ABS, fuel injectors, adjusting throttle, coolant pumps, EVAP test, fuel trim reset, etc. No more Guesswork. Quickly identify problem components without teardown, get fuss-free results in seconds.
- 【9 HOT RESET SERVICES CAR SCANNER】Tired of costly mechanic trips for common resets? The Kingbolen S608 obd2 scanner lets you do it yourself, even for beginners—quickly and effortlessly! It offers 9 hot reset functions: Oil/EPB Reset, ABS Bleeding, SAS Calibration, DPF Regeneration, Injector Coding, BMS Matching, Throttle Adaptation, Gear Learning. Stop paying mechanics for 5-minute jobs. Save hundreds per year! 🚗*Function vary from vehicle models. reach us to check compatibility firstly!
- 【4 SYSTEM DIAGNOSTIC TOOL + FULL OBDII FUNCTIONS】Kingbolen S608 is an OBDII scanner and 4 systems diagnostic tool made for home mechanics, DIYers, and professionals. You can access Engine, ABS, SRS, Transmission fault codes, track live data in graphs, and onboard DTC library lookup to find the right troubleshooting procedure, and diagnose with full 10 OBD2 test modes to fix most of emission issues. Give your aging cars routine maintenance to avoid costly repairs, a breakdown, or even a crash.
- 【NEW CAN FD, FCA/RENAULT SGW, 140+ BRANDS】Kingbolen S608 scanner for car supports 140+ vehicle brands, 100,000+ models, 28 languages and can be used worldwide. S608 stays up-to-date with modern vehicles, allows secure access to 2017+ FCA cars and 2015+ Renault cars (📢*Need to purchase an AutoAuth/Renault account by yourself), and supports the latest CAN-FD protocol for 2019+ GM/Chrysler, enabling 2X faster data transfer and more precise diagnostics. 🚗*Check compatibility before purchase.
This product presentation was made with AAWP plugin.
Last update on 2026-05-11 / Affiliate links / Images from Amazon Product Advertising API