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NHTSA ID Number: 10222798
Manufacturer Communication Number: 22-NA-060
Summary
This informational bulletin provides a procedure to install an isolator over the valve cover if found missing and corrects the customers concern.
Condition
Some customers may comment that they hear a tick or rattle type noise coming from the engine compartment
– This noise may be noticeable on the top of the engine near the left or right-side rocker cover area.
Cause
This condition may be caused by the left or right side rocker cover insulator.
– For a short period of time the insulator was manufactured without the fiberglass insulation (as indicated in the graphic below) that is used to reduce the normal engine valvetrain noise. This was due to an unavoidable supply shortage issue. Without this fiberglass insulation an increase in valvetrain noise on that bank may be noticeable.
Correction
If you encounter a vehicle with this condition and the noise is unacceptable to the customer, you can install a service cover which has the insulation attached to the insulator to help reduce the valvetrain noise.
Parts Information
| RPO | Description | Part Number | Qty |
| 5.3L RPO (L84) 6.2L RPO (L87) | INSULATOR, VLV RKR ARM CVR | 12674122 | 1 |
| 5.3L RPO (L84) 6.2L RPO (L87) | INSULATOR, VLV RKR ARM CVR RIGHT | 12703336 | 1 |
| 6.6L RPO (L8T) | INSULATOR, VLV RKR ARM CVR LEFT | 12703339 | 1 |
| 6.6L RPO (L8T) | INSULATOR, VLV RKR ARM CVR RIGHT | 12703340 | 1 |
13 Affected Products
Vehicles
| MAKE | MODEL | YEAR |
CADILLAC | ESCALADE | 2022 |
| CADILLAC | ESCALADE ESV | 2022 |
| CHEVROLET | SILVERADO 1500 | 2022 |
| CHEVROLET | SILVERADO 2500 | 2022 |
| CHEVROLET | SILVERADO 3500 | 2022 |
| CHEVROLET | SUBURBAN | 2022 |
| CHEVROLET | SUBURBAN 1500 | 2022 |
| CHEVROLET | TAHOE | 2022 |
| GMC | SIERRA 1500 | 2022 |
| GMC | SIERRA 2500 | 2022 |
| GMC | SIERRA 3500 | 2022 |
| GMC | YUKON | 2022 |
| GMC | YUKON XL | 2022 |
1 Associated Document
Manufacturer Communications
Bulletin No.: 22-NA-060
Date: September, 2022
MC-10222798-0001.pdf 989.963KB
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SEOCONTENT-START
Copyright 2022 General Motors LLC. All Rights Reserved. Service Bulletin Bulletin No.: 22-NA-060 Date: September, 2022 INFORMATION Subject: Information on Possible Tick or Rattle Noise Concern from Left and/or Right Side Rocker Cover Brand: Model: Model Year: Breakpoint Date: Engine: Transmission: from to from to Cadillac Escalade Models 2022 2022 March 20, 2022 April 10, 2022 5.3L (L84), 6.2L (L87) Chevrolet Silverado 1500 – LTD (RPO J21, VIN Digit 12 = 4 or less) Silverado 1500 – New (RPO J22, VIN Digit 12 = 5 or greater) Silverado 2500HD/ 3500HD Suburban Tahoe GMC Sierra 1500 – Limited (RPO J21, VIN Digit 12 = 4 or less) Sierra 1500 – Limited (RPO J22, VIN Digit 12 = 5 or greater) Sierra 2500HD/ 3500HD Yukon Models Involved Region or Country North America Condition Some customers may comment that they hear a tick or rattle type noise coming from the engine compartment – This noise may be noticeable on the top of the engine near the left or right-side rocker cover area. Page 2 September, 2022 Bulletin No.: 22-NA-060 Cause This condition may be caused by the left or right side rocker cover insulator. – For a short period of time the insulator was manufactured without the fiberglass insulation (as indicated in the graphic below) that is used to reduce the normal engine valvetrain noise. This was due to an unavoidable supply shortage issue. Without this fiberglass insulation an increase in valvetrain noise on that bank may be noticeable. 6018737 Correction If you encounter a vehicle with this condition and the noise is unacceptable to the customer, you can install a service cover which has the insulation attached to the insulator to help reduce the valvetrain noise. Service Procedure Refer to Valve Rocker Arm Cover Insulator Replacement – Left Side in the Service Manual and/or Valve Rocker Arm Cover Insulator Replacement – Right Side in the Service Manual. Parts Information Causal Part RPO Description Part Number Qty X 5.3L RPO (L84) 6.2L RPO (L87) INSULATOR, VLV RKR ARM CVR 12674122 1 X 5.3L RPO (L84) 6.2L RPO (L87) INSULATOR, VLV RKR ARM CVR RIGHT 12703336 1 X 6.6L RPO (L8T) INSULATOR, VLV RKR ARM CVR LEFT 12703339 1 X 6.6L RPO (L8T) INSULATOR, VLV RKR ARM CVR RIGHT 12703340 1 Bulletin No.: 22-NA-060 September, 2022 Page 3 Warranty Information For vehicles repaired under warranty, use: Labor Operation Description Labor Time 4060740 Valve Rocker Arm Cover Insulator Replacement – Right Side Use the Published Labor 4060750 Valve Rocker Arm Cover Insulator Replacement – Left Side Operations Time Version 1 Modified Released September 16, 2022 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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