NHTSA ID Number: 10222664
Manufacturer Communication Number: 22-NA-022
Summary
This Informational bulletin advises the technician of a possible oil leak at the front cover and how to diagnose it to verify if it is coming from the seal or not.
Condition
Some customers may comment on a oil leak.
The technician may find DTC P06DD set.
Cause
This condition may be caused by the rear main oil seal may have moved or severely
shifted out of position in the Timing Chain Lower Cover.
Correction
Replace the Timing Chain Lower Cover that comes with a seal already installed.
Parts Information
| Description | Part Number | Qty |
| Lower Timing Cover | 55515618 | 1 |
25 Affected Products
Vehicles
| MAKE | MODEL | YEAR |
| CADILLAC | ESCALADE | 2021-2023 |
| CADILLAC | ESCALADE ESV | 2021-2023 |
| CHEVROLET | SILVERADO 1500 | 2020-2022 |
| CHEVROLET | SUBURBAN | 2021-2023 |
| CHEVROLET | SUBURBAN 1500 | 2021-2022 |
| CHEVROLET | TAHOE | 2021-2023 |
| GMC | SIERRA 1500 | 2020-2022 |
| GMC | YUKON | 2021-2023 |
| GMC | YUKON XL | 2021-2022 |
1 Associated Document
Manufacturer Communications
Bulletin No.: 22-NA-022
Date: September, 2022
MC-10222664-0001.pdf 122.835KB
- Formulated for engines with 75,000 miles or more, Valvoline MaxLife High Mileage synthetic blend is formulated with seal conditioners to help prevent oil leaks and reduce oil consumption
- Delivers 20% better wear protection and 15% better sludge defense than industry standards to help prevent engine breakdown
- Extra detergents safeguard against friction, corrosion and deposits to keep high-mileage engines clean
- Advanced friction-fighting additives help maximize performance and improve fuel efficiency
- Provides performance benefits for high mileage, new and re-built engines alike
- Phosphorus Replacement Technology helps extend emission system life
- Superior dispersancy that fights sludge build up
- Exceptional oil burn-off protection exceeding industry standards* | Seal conditioners to help reduce leaks
- Advanced additives that help prevent engine wear | Improved Fuel Economy**
- Meets or exceeds the following specifications: API SP/SN PLUS/SN/SM | ILSAC GF-6 | Meets Ford WSS-M2C946-B1 | Meets Ford WSS-M2C961-A1 | * Based on API and ACEA volatility specifications | ** In 5W-20, 5W-30 and 10W-30 grades versus industry specifications
- Advanced protection against the four main causes of engine breakdown: wear friction heat and deposits
- Delivers 40% stronger wear protection than industry standards to reduce friction and improve fuel economy
- Provides 15% better deposit defense vs. industry standards, keeping engines cleaner for smoother performance and longer-lasting protection
- Up to 2.5X better heat protection vs. industry standards to fight harmful sludge formation and thermal breakdown
- Engineered for excellent low-temperature flow, reducing metal-to-metal contact during cold starts — when most engine wear typically occurs
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Copyright 2022 General Motors
LLC. All Rights Reserved. Service Bulletin Bulletin No.: 22-NA-022 Date: September, 2022 INFORMATION Subject: Diagnostic Tip for LM2 Diesel with a Rear Main Oil Leak with or without DTC P06DD set This bulletin replaces PIP5795. Please discard PIP5795. Brand: Model: Model Year: VIN: Engine: Transmission: from to from to Cadillac Escalade Models 2021 2023 3.0L (LM2, LZO) Chevrolet Silverado 1500 2020 2021 Silverado 1500 – LTD (RPO J21, VIN Digit 5 = W/Y) 2022 2022 Silverado 1500 – New (RPO J22, VIN Digit 5 = A/D) Suburban 2021 2023 Tahoe 2021 2023 GMC Sierra 1500 2020 2021 Sierra 1500 – Limited (RPO J21, VIN Digit 5 = 8/9) 2022 2022 Sierra 1500 – New (RPO J22, VIN Digit 5 = H/U) Yukon Models 2021 2023 Involved Region or Country North America, Middle East, Chile (West), Colombia (West), Ecuador (West), Paraguay (West), Peru (West), Japan, Cadillac Korea (South Korea), Thailand (ASEAN), Australia/ New Zealand Condition Some customers may comment on a oil leak. The technician may find DTC P06DD set. Cause This condition may be caused by the rear main oil seal may have moved or severely shifted out of position in the Timing Chain Lower Cover. Correction Replace the Timing Chain Lower Cover that comes with a seal already installed. Page 2 September, 2022 Bulletin No.: 22-NA-022 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. Service Procedure Refer to Timing Chain Lower Cover Installation in SI. Record the Part Unique Number found on the white label attached to the back of the cover as shown in the picture below. 5786767 Example: PUN 50H32015310119 The Timing Chain Lower Cover comes with a 2 piece protector/installer. The inner piece becomes an installation tool. The outer piece simply holds them together for shipment. 5786654 Remove the outer piece (2) and discard it. 5786653 Note: The inner piece is an installation tool designed to be a substitute for the EN52466-2 installation tool. It fits over the bevel on the end of the crankshaft to facilitate installation. Be extremely mindful that the inner lip of the seal slides over the rear of the crankshaft without rolling or a repeat oil leak will occur. The protector/installer has a snug fit to the pilot of the crankshaft. The picture below is shown without the cover for clarity. Bulletin No.: 22-NA-022 September, 2022 Page 3 5786655 Parts Information Causal Part Description Part Number Qty N/A Lower Timing Cover 55515618 1 Warranty Information For vehicles repaired under warranty, use: Labor Operation Description Labor Time 4064380 Timing Chain Lower Cover Replacement Use the Published Labor Operations Time Version 2 Modified Released January 31, 2022 Revised September 09, 2022 – Added 2023 to Model Year. 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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