23-NA-170 Service Bulletin/Repair Instructions

Bulletin No.:
Service Bulletin
Date:
23-NA-170

January, 2024
INFORMATION

Subject:
Diagnostic Tips for Seized Engine or Engine Noise

This bulletin replaces PIP5900. Please discard PIP5900.
Brand:
Model:

CT5
Cadillac
Chevrolet
Escalade
Model Year:

from
to
2022

2021
VIN:

from
Engine:

to

6.2L (LT4)
2024
6.2L (L87)
2023
6.2L (LT4)
Camaro
2019
6.2L (LT1, (LT4)
Corvette
2019
2024
Express
2021
Silverado 1500 (New

Model)
2019
2019
Silverado 1500
2020
2021
Silverado 1500 lTD

(RPO J21, VIN Digit

5 = W/Y)

Silverado 1500 New

(RPO J22, VIN Digit

5 = A/D)
2022
Silverado 1500
2023
Silverado 2500HD/

3500HD
2020
Suburban
2021
Tahoe
2021
Copyright 2024 General Motors LLC. All Rights Reserved.
6.2L (LT1,

LT4, LT2)

6.6L (L8T)
2022
4.3L (LV3)

5.3L (L82)

5.3L (L84)

6.2L (L87)
6.6L (L8T)

2024
5.3L (L84)

6.2L (L87)

5.3L (L84)

6.2L (L87)
Transmission:
Page 2

Brand:
January, 2024

Model:
from
to
Savana
2021
2024
Sierra 1500 (New

Model)
2019
2019
Sierra 1500
2020
2021
Sierra 1500 Limited

(RPO J21, VIN Digit

5 = 8/9)

GMC
Model Year:
Sierra 1500 New

(RPO J22, VIN Digit

5 = H/U)
2022
Sierra 1500
2023
Sierra 2500HD/

3500HD
2020
Yukon
2021
2022
2024
Bulletin No.: 23-NA-170

VIN:
from
Engine:
Transmission:
to

6.6L (L8T)
4.3L (LV3)

5.3L (L82)

5.3L (L84)

6.2L (L87)
6.6L (L8T)

5.3L (L84)

6.2L (L87)
Involved Region or Country
North America, Europe, Kazakhstan, Uzbekistan, Russia, Middle East, Iraq, Israel,

Palestine, Argentina (Mercosur), Brazil (Mercosur), Bolivia (West), Chile (West),

Colombia (West), Ecuador (West), Paraguay (West), Peru (West), Uruguay (West),

Venezuela (West), Other Central America, Japan, Cadillac Korea (South Korea), GM

Korea Company, China - SGM, Taiwan , Thailand (ASEAN), Singapore, Philippines,

Australia/New Zealand, Caribbean, Egypt, Other Africa, South Africa
Condition
Some 4.3L, 5.3L, or 6.2L engines may not crank due to being seized with possible starter

fuse being open.

Various engine noises such as but not limited to:

• Thumping (which may be perceived as upper engine noise or possibly from the

transmission)

• Knocking

• Rattling
Cause
This condition may be caused by a crankshaft bearing failure.

Bearings Diagnosis:

If any of the above issues are present and the condition has been identified as an internal

engine concern, the following may be helpful:

– Inspect the engine oil and filter for excessive metal debris, specifically bearing

material.
⇒ If bearing debris has been identified, then it will be necessary to remove the

engine oil pan for further inspection of the crankshaft rod and main bearings.

Information
If it has been found there is damage to the crankshaft bearings, please follow the latest

versions of Technical Service Bulletins 22-NA-074 and 18-NA-073 for further repair

direction.

Starter Concerns:

• If you find it necessary to replace the engine assembly, upon completion of the engine

replacement, ensure that the engine starts and runs as designed and there are no

other concerns. If the starter fuse is or was blown, replace the starter fuse and ensure

the vehicle starts up and operates as designed.

• If you noticed that the starter fuse was blown, it will be necessary to replace the starter

fuse once new engine is installed. Do not replace the starter assembly. After fuse

replacement, if you find that there may be a possible starter concern refer to

diagnostic information in service information for further details.
Bulletin No.: 23-NA-170
January, 2024
Page 3
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.
Version
3
Modified
Released September 19, 2023

Revised September 22, 2023 - Revise Model section and added Additional Countries to

Involved Region or Country section.

Revised January 16, 2024 - Added 2024 Model Year to Applicable Models.
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.
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TECHNICIAN

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