22-NA-218 Service Bulletin/Repair Instructions

Bulletin No.:
Service Bulletin
Date:
22-NA-218

November, 2022
INFORMATION

Subject:
Information on General Motors 6.2L Normal Engine Noise Concerns
Brand:
Model:
Cadillac
to
Escalade Models
2019
2023
Silverado 1500

(New Model)
2019
2019
Silverado LD
2019
2019
Silverado 1500
2020
2021
2022
2022
Silverado 1500
2023
2023
Silverado

2500HD/3500HD
2020
2023
Suburban
2019
2023
Tahoe
2019
2023
Sierra 1500

(New Model)
2019
2019
Sierra Limited
2019
2019
Sierra 1500
2020
2021
2022
2022
Sierra 1500
2023
2023
Sierra

2500HD/3500HD
2020
2023
Yukon Models
2019
2023
Silverado 1500 - LTD

(RPO J21, VIN Digit

5 = W/Y)

Chevrolet
GMC
Model Year:

from
Silverado 1500 New (RPO J22, VIN

Digit 5 = A)
Sierra 1500 - Limited

(RPO J21, VIN Digit

5 = 8/9)

Sierra 1500 - New

(RPO J22, VIN Digit

5 = H/U)
Copyright 2022 General Motors LLC. All Rights Reserved.
VIN:

from
to
Engine:
L87, L8T
Transmission:
Page 2
November, 2022
Bulletin No.: 22-NA-218
Involved Region or Country
North America, Europe, 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),

Japan, Cadillac Korea (South Korea), GM Korea Company, China - SGM, Thailand

(ASEAN), Australia/New Zealand, Other Africa
Condition
Some customers may comment that they hear different noises coming from the engine

compartment area or under vehicle which they may think are abnormal and may request

clarification of what is causing the noise. The noises may be described as a chirp,

squeak, or sputter type noise.
Information
High pitched noise described as chirp, squeak, sputter. Typically these noise occur when

spark timing is retarded. These noises are much more noticeable on the 6.2L L87 and

6.6L L8T engines as than are on the 5.3L engines. These noises can typically be heard

outside the vehicle or with windows down. Noises will come from underneath the vehicle

in the wheel well/front door area. Being next to a reflecting surface such as a wall,

guardrail or vehicle in next lane will make the noise more noticeable.
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.
Additional Information

There are 4 different types of noise that a customer

may notice. Not all vehicles will exhibit all the noises.

Refer to the table below to see what noises may be

noticeable per model year and RPO.

1. Catalyst Light Off - Occurs on start when spark

retard required for catalyst rapid warm up. Lasts

approx. 30 sec. Catalyst rapid warm up is not

triggered on all starts. Truck generally must have

sat for an hour or more.

2. Engine Restart - Engine Restart following complete

engine shutdown coasting down through

approximately 14 MPH (22 km/h). This noise will

only last for about 1 second. Spark retarded to

prevent engine overspeed/torque bump.

Version
1
Modified
Released October 31, 2022
3. Auto-Start - following start/stop engine shutdown.

The noise will last for less than a second at the end

of the auto-start. Spark retarded to prevent engine

overspeed/torque bump.

4. Throttle Blip - Light throttle blip in park/neutral. This

is rarely noticed and may be hard to produce.

Spark retarded to prevent engine overspeed.

Important: Dealers should not attempt to compare any

customer vehicles exhibiting these noises with other

similar vehicles as the noise is different from vehicle to

vehicle and this may lead to the incorrect conclusion

that the vehicle has a condition. These noises are a

normal operating characteristic of the engine. These

noises have no short- or long-term effect on the engine.

Do not attempt repairs for these noises.

Important: Replacing the engine or internal

components for this noise will not reduce or eliminate

the noise.

Please communicate to the customer that the engine is

functioning as designed and these are normal

conditions of their vehicle. Please share this

information with the customer, including a copy of this

message.
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

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