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NHTSA ID Number: 10205572
Manufacturer Communication Number: 21NA250
Summary
This bulletin advises the tech to replace the engine mounts if found the cause of the popping noise.
1 Affected Product
Vehicle
| MAKE | MODEL | YEAR |
BUICK | ENVISION | 2021 |
Condition
Some customers may comment on a pop noise heard from the front of vehicle when shifting from Park to Drive and/or Park to Reverse.
– The noise can also occur at low speed parking lot maneuvers (i.e. Accelerator pedal tip in, tip out, and braking).
Cause
This condition may be caused by the right side engine mount or left side transmission mount failure.
Correction
Diagnose bad mount with chassis ears and replace failed mount.
Service Procedure
Refer to Engine Mount Replacement or Transmission Mount Replacement in SI.
Parts Information
| Causal Part | Description | Part Number | Qty |
| X | MOUNT, ENG | 84356441 | 1 |
| 84356442 | 1 | ||
| X | MOUNT, TRANS | 84356461 | 1 |
| 84356456 | 1 | ||
| N/A | BOLT, ENG MT | 11589275 | 2 |
| N/A | BOLT, ENG MT BRKT | 11547744 | 3 |
| N/A | BOLT, TRANS MT BRKT | 11610907 | 4 |
SEOCONTENT-START
Copyright 2021 General Motors LLC. All Rights Reserved.
Service Bulletin Bulletin No.: 21-NA-250
Date: November, 2021
TECHNICAL
Subject: Pop Noise From Front of Vehicle
Brand: Model:
Model Year: Vehicle Build Date:
Engine: Transmission:
from to from to
Buick Envision 2021 2021 SORP January
01, 2021
Involved Region or Country North America
Condition
Some customers may comment on a pop noise heard from the front of vehicle when
shifting from Park to Drive and/or Park to Reverse.
– The noise can also occur at low speed parking lot maneuvers (i.e. Accelerator pedal tip
in, tip out, and braking).
Cause This condition may be caused by the right side engine mount or left side transmission
mount failure.
Correction Diagnose bad mount with chassis ears and replace failed mount.
Service Procedure
Refer to Engine Mount Replacement or Transmission
Mount Replacement in SI.
Parts Information
Use the VIN and refer to the GM Electronic Parts
Catalog (EPC) to determine the proper part to order.
Causal
Part
Description Part
Number
Qty
X MOUNT, ENG
84356441 1
84356442 1
X MOUNT, TRANS
84356461 1
84356456 1
N/A BOLT, ENG MT 11589275 2
N/A BOLT, ENG
MT BRKT 11547744 3
N/A BOLT, TRANS
MT BRKT 11610907 4
Page 2 November, 2021 Bulletin No.: 21-NA-250
Warranty Information
Important: Only select the labor operation that
coincides with the repair performed.
For vehicles repaired under warranty, use:
Labor Operation Description Labor Time
4067090 Engine Mount Replacement Use the Published Labor
8464270 Transmission Mount Replacement Operations Time
Version 1
Modified Released November 10, 2021
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
SEOCONTENT-END
1 Associated Document
Manufacturer Communications
Bulletin No.: 21-NA-250
Date: November, 2021
MC-10205572-9999.pdf 502.514KB
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Bestseller No. 1
Steelman Wireless ChassisEAR Auto Diagnostic Tool Kit, Identify The Cause of Troubling Vehicle Noises, 4 Transmitters with 50-Foot Range (61082)
- NOISE DETECTION - Detect the source or squeaks, rattles, and other errant or troublesome noises
- 50-FOOT RANGE - Transmitters have a 50-foot signal range allowing use on small and large vehicles
- BUILT-IN SPEAKER - Monitor sounds with the built-in speaker or via headphones through the 3.5mm jack
- SIGNAL STRENGTH INDICATOR - LED lights indicate signal strength of the active channel
- ILLUMINATED CHANNEL BUTTONS - Active channels have illuminated buttons and can be changed or muted with a quick push
Bestseller No. 2
STEELMAN PRO Wireless ChassisEAR 2 Auto Diagnostic Kit
- Quickly detect the source of squeaks, rattles, and other noises throughout a car or truck's chassis
- Kit includes four independent transmitters to mount throughout the vehicle
- 4.3-inch LCD touchscreen-equipped control unit with easy to use interface
- Transmitter jumpers allow separate mounting of clamps and transmitters in confined spaces
- Color coded boots and location naming in software to quickly locate trouble spots
SaleBestseller No. 3
ZKTOOL Chassis Ears Electronic Stethoscope Diagnostic Kit with Headphones, Electronic Ears Automotive,6 Channel Car Engine Noise Finder Sound Detector Tester Tool Set
- Auto Detector Tool with Seek Out the Noises:This automotive engine tools is specially designed and developed for checking abnormal noise of automobile engine, abnormal noise of body, and abnormal noise of chassis, etc.The host computer with integrated six-channel signal receiver is used with six different sensors to detect abnormal noise during the driving of the car, synchronized with sound and light, which can easily identify the early problems
- Multi-Channel Chassis Ears Automotive Engine Tool:6-channel detector design, sound and light synchronization. This auto detector tool can detect abnormal noise in different locations and adjust the reception of different channels according to the detection situation.When a generator is running, it can detect the impact of vibration due the failure of a bearing, gear, valve, crank, cylinder, gearbox, vehicle body noise, etc.
- Abnormal sound indicator lighe:The abnormal sound indicator consists of three colors: green, yellow, and red. The color changes are determined by the detected volume. The minimum volume is green and the maximum is red. The abnormal noise of the six channels can be shown at the same time through the six rows of indicator lights. By adjusting the light sensitivity knob, the indicator can be used to assist in judging the location of the anomalous noise.
- Chassis Ear Car Detector Tool with Indicator light sensitivity & headphone channel socket:The car engine noise detector tool turn the indicator light clockwise to increase the sensitivity, and the range of the indicator light changes with the adjustment of the sensitivity. 6 Channel chassis ear car detector tool have six channels to detect abnormal noise sources at different locations at the same time, freely select channels through channel selection.
- List: The package includes 1 * detector host, 6 * clip-on sensors (Abnormal noise information can be detected at six different locations at the same time), 1 * headphone (Simple and comfortable, the volume can be adjusted at will), 3 * 3M sensor extension cables, 3 * 5M sensor extension cables. If you encounter any problems during use, please feel free to contact us.
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Chassis Ear Automotive Engine Noise Finder Tool, 6 Channel Chassis Ears Sound Detector Identify the Troubling Engine Noises (Over-Ear Headphones)
- 【Multi-Channel Chassis Ears 】6-channel detector design, the host computer with integrated 6-channel signal receiver is used with 6 different sensors ,sound and light synchronization. Engine noise detector can detect abnormal noise in different locations and adjust the reception of different channels according to the detection situation. When a generator is running, it can detect the impact of vibration due the failure of a bearing, gear, valve, crank, cylinder, gearbox, vehicle body noise, etc.
- 【LED Indicator and Adjustable Sensitivity】The power indicator lights up when the chassis ears starts up and begins testing. The abnormal sound indicator is divided into three colors: green, yellow, and red. The color changes are determined by the detected volume. The minimum volume is green and the maximum is red. By adjusting the light sensitivity knob, the indicator can be used to assist in judging the location of the anomalous noise.
- 【High Sensitivity】The chassis ears detector has high sensitivity and the earphone pick-up sound loudness can be controlled by adjusting its volume control. The automotive noise detector turn the indicator light clockwise to increase the sensitivity, and rotate counter clockwise to reduce sensitivity, the range of the indicator light changes with the adjustment of the sensitivity.
- 【Quickly Detection and Positioning】This chassis ears engine noise detector is specially designed and developed for checking abnormal noise of automobile engine, abnormal noise of body, and abnormal noise of chassis, etc. It can quickly find out the noise source and its location, accurately locate the fault, easily identify the early problems of the car and facilitate car repair as soon as possible.
- 【Packing List and Warranty】The engine chassis ear kit includes automotive detector tool, 6 clip-on sensors, sensor extension cords (3 for a 5-meter extension cord and 2 for a 3-meter extension cord), over-ear earphones. All accessories are neatly packed in the tool case for easy carrying. And we offer 12 months warranty, if you encounter any problems during use, you can get help from us, we will replace or refund, customer satisfaction is our top priority.
Bestseller No. 5
Mefape Automotive Stethoscope, Chassis Ears with 6 Channels Color Light Indicators, Electronic Stethoscope, Automotive Diagnostic Kit, Mechanic Stethoscope for Auto Body Engine Chassis, Vol Up/Down
- Automotive Diagnostic Kit used to to help diagnose and fix problems with your vehicle by efficiently locating the noise in fuel injection system, chassis, engine, bearings, gears, and suspension system
- Mechanic Stethoscope Kit equipped with a 6-channel host and 6 different sensors, applicable to different parts of vehicles
- Electronic Stethoscope features color light indicators that help you identify the source of the noise, easier to diagnose and fix problems
- Chassis Ears come with premium headphones that are excellent in anti-interference and can transmit high-quality clear sounds
- Auto Stethoscope Kit is easy to use, cost-effective for diagnosing and fixing problems with vehicles, heavy machinery, etc
Bestseller No. 6
Shkalacar Chassis Ears Automotive Electronic Stethoscope, Mechanic Stethoscope Car Engine Noise Detector with Headphones, Multi-Channel Sensitivity Diagnostic with Extension Cables & Handbag
- 【SPECIAL Electronic Stethoscope】This automotive stethoscope kit is specially designed and developed for checking abnormal noise of car engine, abnormal noise of body, and abnormal noise of chassis, etc. The host computer with integrated six-channel signal receiver is used with six different sensors to detect abnormal noise during the driving of the car, synchronized with sound and light, which can easily identify the early problems of the car and facilitate car repair as soon as possible.
- 【SENSITIVITY ADJUSTMENT】Chassis Ears with Indicator light sensitivity adjustment: Turn clockwise to increase sensitivity and rotate counterclockwise to reduce sensitivity, the range displayed by the indicator light changes with the adjustment of the sensitivity; Sound sensitivity adjustment: Turn clockwise to increase sensitivity, this is the range of adjusting the sensor's Income tone.
- 【ABNORMAL SOUND INDICATOR LIGHT】The Automotive Stethoscope onsists of three colors: green, yellow, and red. The color changes are determined by the detected volume. The minimum volume is green and the maximum is red. The abnormal noise of the six channels can be shown at the same time through the six rows of indicator lights. By adjusting the light sensitivity knob, the indicator can be used to assist in judging the location of the anomalous noise.
- 【MAIN APPLICATION】Mechanics Stethoscope with Six-channel car noise finder is a portable device that can be used to detect bearings, gears and suspension systems, and automatic transmission system, detect abnormal sound of fuel injection system, abnormal sound of chassis system, abnormal noise under the hood, quickly find out the noise source and its location, accurately locate the fault.
- 【CONFIGURATION LIST】The package includes 1 * detector host, 6 * clip-on sensors (Abnormal noise information can be detected at six different locations at the same time), 1 * headphone (Simple and comfortable, the volume can be adjusted at will), 3 * 3M sensor extension cables, 3 * 5M sensor extension cables. If you have any problems during use, please feel free to contact us.
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KTTOOL 6 Channel Car Engine Noise Finder, Sound Detector Tester Tool Set, Chassis System Ears, Electronic Stethoscope Diagnostic Kit with Headphones
- 🚕【PMulti-Channel Chassis Ears Automotive Engine Tool】: 6-channel detector design, sound and light synchronization. This auto detector tool can detect abnormal noise in different locations and adjust the reception of different channels according to the detection situation.When a generator is running, it can detect the impact of vibration due the failure of a bearing, gear, valve, crank, cylinder, gearbox, vehicle body noise, etc.
- 💡【Abnormal sound indicator lighe】: The abnormal sound indicator consists of three colors: green, yellow, and red. The color changes are determined by the detected volume. The minimum volume is green and the maximum is red. The abnormal noise of the six channels can be shown at the same time through the six rows of indicator lights. By adjusting the light sensitivity knob, the indicator can be used to assist in judging the location of the anomalous noise.
- 🔎【Chassis Ear Car Detector Tool with Indicator light sensitivity & headphone channel socket】: The car engine noise detector tool turn the indicator light clockwise to increase the sensitivity, and the range of the indicator light changes with the adjustment of the sensitivity. 6 Channel chassis ear car detector tool have six channels to detect abnormal noise sources at different locations at the same time, freely select channels through channel selection.
- 📈【List】: The package includes 1 * detector host, 6 * clip-on sensors (Abnormal noise information can be detected at six different locations at the same time), 1 * headphone (Simple and comfortable, the volume can be adjusted at will), 3 * 3M sensor extension cables, 3 * 5M sensor extension cables. If you encounter any problems during use, please feel free to contact us.
- ✅【Excellent Service】：We are committed to providing the best professional tools and the best service for auto repair. If you have any questions, please don't hesitate to contact us. We provide 24-hour before and after-sales service.
Bestseller No. 8
Chassis System Ears Electronic Stethoscope Diagnostic Kit with Headphones, PLAYOCCAR 6 Channel Car Engine Noise Finder Sound Detector Tester Tool Set
- 【SPECIAL DETECTOR TOOL】This automotive stethoscope kit is specially designed and developed for checking abnormal noise of car engine, abnormal noise of body, and abnormal noise of chassis, etc. The host computer with integrated six-channel signal receiver is used with six different sensors to detect abnormal noise during the driving of the car, synchronized with sound and light, which can easily identify the early problems of the car and facilitate car repair as soon as possible.
- 【ABNORMAL SOUND INDICATOR LIGHT】The abnormal sound indicator consists of three colors: green, yellow, and red. The color changes are determined by the detected volume. The minimum volume is green and the maximum is red. The abnormal noise of the six channels can be shown at the same time through the six rows of indicator lights. By adjusting the light sensitivity knob, the indicator can be used to assist in judging the location of the anomalous noise.
- 【SENSITIVITY ADJUSTMENT】Indicator light sensitivity adjustment: Turn clockwise to increase sensitivity and rotate counterclockwise to reduce sensitivity, the range displayed by the indicator light changes with the adjustment of the sensitivity; Sound sensitivity adjustment: Turn clockwise to increase sensitivity, this is the range of adjusting the sensor's Income tone.
- 【MAIN APPLICATION】Six-channel car noise finder is a portable device that can be used to detect bearings, gears and suspension systems, and automatic transmission system, detect abnormal sound of fuel injection system, abnormal sound of chassis system, abnormal noise under the hood, quickly find out the noise source and its location, accurately locate the fault.
- 【CONFIGURATION LIST】The package includes 1 * detector host, 6 * clip-on sensors (Abnormal noise information can be detected at six different locations at the same time), 1 * headphone (Simple and comfortable, the volume can be adjusted at will), 3 * 3M sensor extension cables, 3 * 5M sensor extension cables. We provide 1 year free warranty & 24 hours customer email support service, please feel free to reach us if you need!
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Steelman EngineEAR Stethoscope Auto Diagnostic Tool, Noise-Canceling Headphones, Ulta-Sensitive Microphone, 9 Volt Battery Included
- Pinpoints noises- locate troublesome noises in cars, trucks, heavy machinery, and more
- Over-ear headphones - mono headphones completely cover the ear to help block out background sounds
- Flexible gooseneck - bendable shaft enables easy access to tight and hard-to-reach spaces
- Aluminum probe - probe features a solid aluminum core that easily transfers sound
- Safe - non-conductive microphone and rubber-booted probe will not damage sensitive electronics
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Steelman Microphone Transmitter Lead and Clamp Replacement Pack for Wireless ChassisEAR Auto Diagnostics Tool, 4-Pack (97202-08)
- REPLACEMENT 4-PACK - Microphone clamps for the STEELMAN 97202, 60635 & 61082 Wireless ChassisEAR Diagnostic Device Kits
- PINPOINT TROUBLING NOISES - Easily pinpoint troubling noises that cannot be duplicated in a repair stall and only occur during road driving
- 2-FOOT CABLES - 2-foot (24-inch) long wire leads provide the length you need to mount wireless transmitters securely yet still be able to reach trouble spots
- STEEL ALLIGATOR CLAMPS - Alligator style clamps are made of durable steel with a sturdy jaw for maximum hold strength
- INSULATED WIRE LEADS - Insulated cables on the wire leads protect against signal interference and damage during use
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