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NHTSA ID Number: 10222668
Manufacturer Communication Number: 22-NA-182
Summary
This informational bulletin advises the tech to check if the trans cooler lines are twisted which may cause the customers concern.
Condition
Some customers may comment on one or more of the following before or after the transmission has been overhauled:
- Harsh shifting
- Shudder
- Surging
- Stalling
- Transmission overheating
Some customers may also comment on above normal transmission fluid temperature.
Cause
This condition may be caused by a twisted cooler line on low mileage vehicles.
Note: A twisted cooler line may cause DTC P27EC to set in the TCM on ETRS transmissions. (RPO MHS MQC).
Inspect for a twisted cooler line, example shown in the graphic above.
In some cases, it may be necessary to remove the under body panels in order to clearly see the cooler lines.
- If the cooler line is twisted, disconnect the cooler line from the transmission auxiliary cooler and untwist it, then reconnect the cooler line.
- If the cooler line remains misshaped after untwisting, the cooler line should be replaced then check the transmission fluid level following SI. Add fluid if needed.
- If no concerns are found with the rubber line being misshaped, check the transmission fluid level following SI. Add fluid if needed.
The Thermal Bypass Valve (TBV) may be the cause of the overheat if a cooler line is not twisted or misshaped. The TBV will open at the following temperatures for the models listed in this TSB. 6 Speed (6L80, 6L90) – 158F (70C) – TBV is external to the transmission 8 Speed (8L90) – 194F (90C) – TBV is external to the transmission 10 Speed (10L80, 10L90, 10L1000) – 143F (61C) – TBV is within the valve body on all listed applications expect those equipped with 3.0 (LM2) Diesel. On the LM2 Diesel the TBV is external to the transmission
32 Affected Products
Vehicles
| MAKE | MODEL | YEAR |
CADILLAC | ESCALADE | 2021-2023 |
| CHEVROLET | SILVERADO 1500 | 2021-2023 |
| CHEVROLET | SILVERADO 2500 | 2021-2023 |
| CHEVROLET | SILVERADO 3500 | 2021-2023 |
| CHEVROLET | SUBURBAN | 2021-2023 |
| CHEVROLET | SUBURBAN 1500 | 2021-2022 |
| CHEVROLET | TAHOE | 2021-2023 |
| GMC | SIERRA 1500 | 2021-2023 |
| GMC | SIERRA 2500 | 2021-2023 |
| GMC | SIERRA 3500 | 2021-2023 |
| GMC | YUKON | 2021-2023 |
1 Associated Document
Manufacturer Communications
Bulletin No.: 22-NA-182
Date: September, 2022
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NHTSA ID Number: 10217793
Manufacturer Communication Number: PIP5792E
Summary
This Preliminary information communicates to the dealer technician that if a customer comments that their vehicle equipped with a 6L80, 6L90, 8L90, 10L80, or 10L100 transmission has a harsh shift, shudder, stall or high transmission fluid temperature concern they should inspect for a twisted transmission cooler line. Technicians are instructed to disconnect the cooler line and untwist it then reconnect the cooler line and inspect the cooler line for being misshaped. Technicians are instructed to replace the cooler line if it is misshaped.
1 Associated Document
Manufacturer Communications
Bulletin No.: PIP5792E
Published date: 07/29/2022
MC-10217793-9999.pdf 197.713KB
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- Helps enhance transmission cooling function
- Designed to protect metal surfaces from wea
- Formulated to condition gaskets
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SEOCONTENT-START
Copyright 2022 General Motors LLC. All Rights Reserved. Service Bulletin Bulletin No.: 22-NA-182 Date: September, 2022 INFORMATION Subject: Information on 6L80 6L90 8L90 10L80 10L90 10L000 Equipped Vehicles With A Harsh Shift, Shudder, Surge, Stall, Transmission Overheating and/or High Transmission Fluid Temperature This bulletin replaces PIP5792E. Please discard PIP5792E. Brand: Model: Model Year: VIN: Engine: Transmission: from to from to Cadillac Escalade 2021 2023 All MHS MHO MQC Chevrolet Silverado 1500 2021 2021 All Except L3B MHS, MHT, MQB MQC MQE MYC Silverado 1500 LTD (RPO J21, VIN Digit 5 = W / Y) 2022 2023 All Except L3B MHS MHT MQB MQC MQE MYC Silverado 1500 New (RPO J22, VIN Digit 5 = A / D) 2022 All Except L3B MHS MHT MQB MQC MQE Silverado 2500HD 3500HD 2021 All MGM MGU MYD Suburban 2021 All MHS MQC Tahoe 2021 All MHS MQC GMC Sierra 1500 2021 2021 All Except L3B MHS MHT MQB MQC MQE MYC Sierra 1500 Limited (RPO J21, VIN Digit 5 = 8 / 9) 2022 2023 All Except L3B MHS MHT MQB MQC MQE MYC Sierra 1500 New (RPO J22, VIN Digit 5 = H / U) 2022 All Except L3B MHS MHT MQB MQC MQE MYC Sierra 2500HD 3500HD 2021 All MGM MGU MYD Yukon 2021 All MHS MQC Page 2 September, 2022 Bulletin No.: 22-NA-182 Involved Region or Country North America, Uzbekistan, Middle East, Brazil (Mercosur), Colombia (West), Ecuador (West), Peru (West), Japan, Cadillac Korea (South Korea), Thailand (ASEAN), Europe, Australia, New Zealand. Condition Some customers may comment on one or more of the following before or after the transmission has been overhauled: • Harsh shifting • Shudder • Surging • Stalling • Transmission overheating Some customers may also comment on above normal transmission fluid temperature. Cause This condition may be caused by a twisted cooler line on low mileage vehicles. Note: A twisted cooler line may cause DTC P27EC to set in the TCM on ETRS transmissions. (RPO MHS MQC). 5758376 Inspect for a twisted cooler line, example shown in the graphic above. In some cases, it may be necessary to remove the under body panels in order to clearly see the cooler lines. • If the cooler line is twisted, disconnect the cooler line from the transmission auxiliary cooler and untwist it, then reconnect the cooler line. • If the cooler line remains misshaped after untwisting, the cooler line should be replaced then check the transmission fluid level following SI. Add fluid if needed. • If no concerns are found with the rubber line being misshaped, check the transmission fluid level following SI. Add fluid if needed. The Thermal Bypass Valve (TBV) may be the cause of the overheat if a cooler line is not twisted or misshaped. The TBV will open at the following temperatures for the models listed in this TSB. 6 Speed (6L80, 6L90) – 158F (70C) – TBV is external to the transmission 8 Speed (8L90) – 194F (90C) – TBV is external to the transmission 10 Speed (10L80, 10L90, 10L1000) – 143F (61C) – TBV is within the valve body on all listed applications expect those equipped with 3.0 (LM2) Diesel. On the LM2 Diesel the TBV is external to the transmission Version 1 Modified Released September 06, 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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