Service Update N202319660 Valve Spring Failure – 2021 Cadillac Chevrolet GMC

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GLOBAL SAFETY FIELD INVESTIGATIONS
DCS5615
URGENT – DISTRIBUTE IMMEDIATELY
Date: December 16, 2020
Subject: N202319660-01 – Service Update
Valve Spring Failure
Revised Vehicle Population
Models: 2021 Cadillac Escalade (RPO L87)
2020-2021 Chevrolet Silverado 1500 (RPO L87)
2021 Chevrolet Suburban, Tahoe (RPO L87)
2020-2021 GMC Sierra 1500 (RPO L87)
2021 GMC Yukon (RPO L87)
To: All General Motors Dealers
This bulletin has been revised to remove the Chevrolet Camaro and Corvette from the
vehicle population. Please discard all copies of bulletin N202319660.
END OF MESSAGE
GLOBAL SAFETY FIELD INVESTIGATIONS
Service Update
N202319660 Valve Spring Failure
Release Date: December 2020 Revision: 01
Revision Description: This bulletin has been revised to remove the Chevrolet Camaro and Corvette from the
vehicle population. Please discard all copies of bulletin N202319660.
Attention: This service update involves vehicles in dealer inventory only and will expire November 30, 2021.
Make Model
Model Year
From To RPO Description
Cadillac Escalade 2021 2021 L87
Chevrolet Silverado 1500 2020 2021 L87
Chevrolet Suburban 2021 2021 L87
Chevrolet Tahoe 2021 2021 L87
GMC Sierra 1500 2020 2021 L87
GMC Yukon 2021 2021 L87
This service update should be performed on vehicles in dealer inventory only. Involved vehicles are marked “open” on
the Investigate Vehicle History screen in GM Global Warranty Management system. This site should always be checked
to confirm vehicle involvement prior to beginning any required inspections and/or repairs.
Condition Certain 2020-2021 model year Chevrolet Silverado 1500, GMC Sierra 1500, and 2021 model year
Cadillac Escalade, Chevrolet Suburban, Tahoe, and GMC Yukon vehicles may present a broken engine
valve spring. This may cause the engine to run rough, an engine knocking or ticking noise, a check
engine light illumination, or a possible vehicle stall.
Correction Dealers are to perform the inspection procedure contained within this bulletin.
Parts
Quantity Part Name Part No.
8 Engine Oil 88865907 US
19353384 CA
All Other
Countries:
Obtain locally
in compliance
with GM spec
GMW17332
1 Engine Oil Filter 12690385
1 Engine Oil Filter 12706595
Note: Use the VIN and the GM Electronic Parts Catalog (EPC) to determine which engine oil and filter to use for the oil
change.
Reminder: Parts may be removed from Retail Inventory Management (RIM). Dealers should review the affected parts
to confirm RIM managed status. Parts may have quantity limiters in effect.
Warranty Information
Labor
Operation Description
Labor
Time
Trans.
Type
Net
Item
9105434 Inspect Only
-If repairs or diagnosis are necessary, open another warranty line
and perform them there under warranty.
5.7
ZFAT *
9105460 Administrative Cost for any Customer VINs in the Population or
Courtesy Transportation Vehicles with more than 500 miles (800 km)
0.2 ZFAT N/A
* The amount identified in “Net Item” should represent the actual sum total of the current GMCC&A Dealer net price for
gasoline needed to perform the required repairs, not to exceed $51 USD, $66.72 CAD. This amount is not to exceed
half a tank of premium gasoline per vehicle.
Important: The following inspection procedure does not need to be performed on any dealer courtesy or demo vehicle
with 500 miles (800 km) or more. Please use labor code 9105460 to close the field action.
Inspection Procedure
1. Ensure vehicle has a ½ tank of fuel minimum.
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2. Set vehicle up in a secure area where it cannot be stolen, with adequate ventilation (use exhaust vent hose if indoors)
and open the hood or engine compartment lid. Keep vehicle away from any flammable surroundings or substances.
Ensure the A/C is off. Finally, position a box fan blowing at the vehicle’s radiator.
3. Apply the brake and start the vehicle, holding the Engine Start/Stop button for at least 15 seconds.
• At this point, T1 SUVs will display an “Automatic Shutdown Disabled” message on the DIC.
• Other vehicles will not display this message on the DIC, but by holding the Engine Start/Stop button for
15 seconds, the feature will still be activated on T1 Trucks.
4. Set up your laptop in the vehicle, plugging the charging cable into the vehicle’s 110v power plug (or use an extension
cord if the vehicle is not so equipped), and the MDI 2 into the vehicle’s OBDII port.
5. Open Techline Connect and navigate through GDS2.
• Select K20 Engine Control Module > Control Functions > Engine Speed/Throttle > Engine Speed.
• Drag the slider to the right until the engine’s idle speed is set to 2,000 RPM.
6. Using your phone or a timer you can keep near you, set a timer for 4 hours and 30 minutes and allow the vehicle to
run.
7. Check on the vehicle at a minimum of 25-minute intervals to ensure it is still running and run down the below checklist
– the more often you can check on it, the better. The checklist includes:
• Normal Engine Operating Temperature
• No abnormal valve train noise
• No check engine light (especially P0300 or P030X)
• No abnormal burning smells (catalytic converter break-in smell is normal operation).
• Look underneath the vehicle and ensure there are no leaks.
8. If for some reason the vehicle does shut off during the test, restart it per the original instructions and continue the
test from the time point where the vehicle shut off. It is not necessary to restart the entire test.
9. If any of these conditions are detected, immediately stop the test, immediately call the GM Technical Assistance
Center for further instructions. For U.S. Dealers contact 877-446-8227. For Canadian Dealers contact 800-263-7740
(English) or 800-263-7960 (French). For International Dealers, if any of these conditions are detected, follow normal
diagnostic and parts ordering procedures.
10. If 4.5 hours passes and none of these conditions are detected, replace any removed components and take the vehicle
for a 10-mile test drive. Ensure the computer and MDI remain in the vehicle during this test drive so you can check
DTCs if necessary. Utilize manual shifting mode for the entire duration of the test drive, attempting to keep RPM
between 2000 and 3500 RPM. During the test drive, monitor for the below conditions. If any of these conditions are
found during the test drive, immediately return to the dealership, keeping the engine RPM as low as possible and
avoiding heavy throttle.
• Normal Engine Operating Temperature
• No abnormal valve train noise
• No check engine light (especially P0300 or P030X)
• No abnormal burning smells (catalytic converter break-in smell is normal operation).
11. If both the high-idle test and the road test complete successfully without any of the above described issues, no further
testing is required.
12. Perform an oil change. Refer to Engine Oil and Oil Filter Replacement in SI.
Dealer Responsibility
Dealers must take the steps necessary to ensure that the service update correction has been made to all involved vehicles
in dealer inventory before selling or dealer-trading the vehicle, but no later than November 30, 2021.
All new, used, GM Certified Used, courtesy transportation vehicles, dealer shuttle vehicles, etc. in dealers’ possession
and subject to this bulletin must be held and inspected/repaired per the service procedure of this bulletin before customers
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take possession of these vehicles. Involved vehicles must be held and not delivered to customers, dealer-traded,
released to auction, used for demonstration, or any other purpose.
All GM Certified Used vehicles currently in the dealers’ inventory within the Certified Pre-Owned Inventory System
(CPOIS) will be de-certified and must be held and remedied per the service procedure in this bulletin. Upon submitting
an accepted/paid warranty transaction in the Global Warranty Management (GWM) system, the vehicle can be re-certified
for sale within the CPOIS system, or once again be used in the CTP program.
Dealer Reports
The Inventory tab of the Open Vehicle Report will contain Service Update Bulletin VINs that apply to this field action.
This information is intended to assist dealers with the PROMPT COMPLETION of these vehicles. The Customer In-
Service tab will not contain Service Update Bulletin VIN data because the intent of a Service Update Bulletin is to not
inconvenience a customer with a special trip for service. Service Update Bulletins are to be completed when the
customer is in for a regularly scheduled visit.

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