NHTSA ID Number: 10206733
Manufacturer Communication Number: PIP5832
Summary
This Preliminary information communicates to the dealer an issue where a vehicle may be exhibiting an engine noise condition. The dealer is instructed on how to isolate the noise to a specific area of the engine for further diagnosis.
16 Affected Products
Vehicles
| MAKE | MODEL | YEAR |
| CADILLAC | ESCALADE | 2021-2022 |
| CHEVROLET | SILVERADO 1500 | 2019, 2021 |
| CHEVROLET | SILVERADO 2500 | 2020, 2022 |
| CHEVROLET | SUBURBAN | 2021-2022 |
| CHEVROLET | TAHOE | 2021-2022 |
| GMC | SIERRA 1500 | 2019, 2021-2022 |
| GMC | SIERRA 2500 | 2020 |
| GMC | YUKON | 2021-2022 |
Condition
Engine may exhibit an internal ticking, tapping or knocking noise that may be difficult to isolate.
Cause
Multiple possibilities
Correction:
If a noise has been determined to be coming from the engine area the following may be helpful in isolating to the upper or lower end:
Verify the noise is not coming from an accessory drive component by briefly running the engine with the accessory drive belt removed.
Using GDS2 select “Cylinder Power Balance” in Fuel System section of output control functions, cancel cylinders one by one and see if the noise is noticeably changed.
Note – Please avoid using GDS2 control function “Cylinder Deactivation” for this procedure as it is deactivating the lifters and is intended for misfire/DFM system diagnosis. This function can be misleading when used for noise diagnostics since it may change/eliminate a lower end noise and give the impression it is a lifter since that is what is being commanded, potentially leading to unnecessary lifter replacement.
If the noise is changed, make a note of which cylinder(s) made the most impact on the noise.
Noises that are noticeably affected by cylinder cancellation are typically considered a “lower end noise” (connecting rod bearing, wrist pin etc.) whereas valvetrain noises aren’t generally impacted by this procedure.
Please review appropriate SI engine noise diagnostic for further isolation of a specific component.
SEOCONTENT-START
Bulletin No.: PIP5832
Published date: 12/16/2021
Preliminary Information
PIP5832 Diagnostic Tips For Engine Noises
Models
Brand: Model: Model Years:
VIN:
Engine: Transmissions:
from to
Cadillac Escalade 2021 – 2022 All All 6.2L L87 All
Chevrolet Silverado 2019 – 2022 All All 5.3L L84, 6.2L L87 All
Chevrolet Suburban 2021 – 2022 All All 5.3L L84, 6.2L L87 All
Chevrolet Tahoe 2021 – 2022 All All 5.3L L84, 6.2L L87 All
GMC Sierra 2019 – 2022 All All 5.3L L84, 6.2L L87 All
GMC Yukon 2021 – 2022 All All 5.3L L84, 6.2L L87 All
Involved Region or Country North America
Condition Engine may exhibit an internal ticking, tapping or knocking noise that may be difficult to isolate.
Cause Multiple possibilities
Correction:
If a noise has been determined to be coming from the engine area the following may be helpful in isolating to the upper or lower end:
Verify the noise is not coming from an accessory drive component by briefly running the engine with the accessory drive belt removed.
Using GDS2 select “Cylinder Power Balance” in Fuel System section of output control functions, cancel cylinders one by one and see if the noise is
noticeably changed.
Note – Please avoid using GDS2 control function “Cylinder Deactivation” for this procedure as it is deactivating the lifters and is intended for misfire/DFM
system diagnosis. This function can be misleading when used for noise diagnostics since it may change/eliminate a lower end noise and give the
impression it is a lifter since that is what is being commanded, potentially leading to unnecessary lifter replacement.
If the noise is changed, make a note of which cylinder(s) made the most impact on the noise.
Noises that are noticeably affected by cylinder cancellation are typically considered a “lower end noise” (connecting rod bearing, wrist pin etc.) whereas
valvetrain noises aren’t generally impacted by this procedure.
Please review appropriate SI engine noise diagnostic for further isolation of a specific component.
Version History
Version 1
Modified 12/16/2021 – Created on.
SEOCONTENT-END
1 Associated Document
Manufacturer Communications
Bulletin No.: PIP5832
Published date: 12/16/2021
- 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
- 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
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- 📡【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】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.
- Pinpoint Road-Test Noise with 6 Precision Piezo Microphones: Equipped with six high-sensitivity piezo microphones, the Zuomeng automotive noise finder accurately captures vibration and mechanical noise directly from suspected components during real road tests. Easily locate hard-to-reproduce noises that only occur while driving, helping reduce unnecessary part replacement and speed up diagnostics for cars, trucks, SUVs, and other vehicles
- Blue-Red-Green Repeating Channel Indicators: Zuomeng features a repeating blue-red-green LED layout that provides a extra visual reference for all six channels. The illuminated light helps quickly identify the active sensor during multi-point diagnostics, making road-test troubleshooting more organized and reducing channel mix-ups
- Adjustable Headphones for Clearer Fault Detection: The included monitoring headphones features a built-in volume adjustment wheel, allowing you to focus on the sound collected by each sensor while reducing surrounding distractions. Clearly distinguish subtle mechanical noises to help identify abnormal vibrations and pinpoint the source of vehicle noise with greater confidence
- 16FT Extra-Long Leads with Writable Location Marking: Each sensor includes a 16ft extended cable for flexible placement across the engine bay, chassis, suspension, drivetrain, or rear axle. Cable ties help secure the wires safely during road testing, while the writable back panel and included dry-erase marker let you label each sensor location for faster troubleshooting and easier comparison
- Rechargeable Wireless Operation for Professional Vehicle Diagnostics: Built-in rechargeable lithium battery eliminates the need for disposable batteries and includes a USB charging cable for convenient recharging. Designed for professional technicians, repair shops, and DIY mechanics performing vehicle noise diagnosis on engines, suspension systems, wheel bearings, drivetrains, and other mechanical components
- PINPOINT NOISES - Easily pinpoint troubling noises that cannot be duplicated in a repair stall and only occur during road driving
- MULTI-CHANNEL - Connect up to six (6) color coded sensor clamps to different locations to find a noise's source
- FULL HEADPHONES - Includes a set of full-coverage over-ear headphones to block out surrounding noise
- USB RECHARGEABLE - USB rechargeable integrated battery provides up to 8 hours of continuous use per charge
- 10-FOOT CABLES - 10-foot long wire leads allow clamps to be positioned in difficult to reach places
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