NHTSA ID Number: 10205597
Manufacturer Communication Number: 21NA281
Summary
This service bulletin provides diagnostic information for technicians in cases of an ETRS system fault or a no start condition – If the vehicle needs to be moved, it is recommended to use wheel dollies, tire skates or the NEW Manual Park Release tool DT-52910.
Condition
Certain service procedures or scenarios may require the transmission to be shifted into Neutral so that the vehicle can be moved or to complete a repair.
Diagnostic Information
Vehicles equipped with an internal Electronic Transmission Range Select (ETRS) system require hydraulic pressure to disengage the park mechanism. Please follow the information listed below when trying to place the transmission into Neutral.
Correction
In cases where the engine can be started – Refer to the Neutral Service Mode document in SI.
In cases of an ETRS system fault or a no start condition – If the vehicle needs to be moved, it is recommended to use wheel dollies, tire skates (example shown above) or the NEW Manual Park Release tool DT-52910 shown above (1). The manual park release tool is available through the GM Special Service Tools website. This new tool will allow the transmission to be manually shifted to neutral, see example SI doc ID 5620825. The manual park release tool can be installed to temporarily shift the vehicle into Neutral when the engine is not running.
Warning: The transmission will be placed in N (Neutral) when the manual park release is pulled. The vehicle can roll on you or others could be injured. Ensure the vehicle is on level ground, parking brake applied, and wheels blocked prior to installation of the manual park release.
Warning: If fuel system is opened the fuel pump should be disabled using the Fuel Pressure Relief, Alternate Method by the removing the B+ fuel pump control module fuse. Using the Fuel Pressure Relief, Scan Tool Method will allow the fuel pump to build pressure if the ignition is placed to run. See Fuel Pressure Relief in Service Information for complete instructions.
Caution: If the manual park release is pulled while the vehicle is on or if the ignition is turned on while the manual park release is pulled, the DIC will display a message to service the transmission.
Caution: The latching mechanism in the manual park release lever will release if the vehicle is started and placed in Park. An attempt to override this function or use of an un-approved tool may cause internal damage to the transmission.
16 Affected Products
Vehicles
| MAKE | MODEL | YEAR |
CADILLAC | CT4 | 2021-2022 |
| CADILLAC | CT5 | 2021-2022 |
| CADILLAC | ESCALADE | 2021-2022 |
| CADILLAC | ESCALADE ESV | 2021-2022 |
| CHEVROLET | SUBURBAN | 2021-2022 |
| CHEVROLET | TAHOE | 2021-2022 |
| GMC | YUKON | 2021-2022 |
| GMC | YUKON XL | 2021-2022 |
1 Associated Document
Manufacturer Communications
Bulletin No.: 21-NA-281
Date: December, 2021
NHTSA ID Number: 10179632
Manufacturer Communication Number: PIT5764
Summary
This Preliminary information communicates how to shift the transmission into neutral for various service procedures.
1 Associated Document
Manufacturer Communications
Bulletin No.: PIT5764
Published date: 08/11/2020
MC-10179632-9999.pdf 145.057KB
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Last update on 2026-06-19 / Affiliate links / Images from Amazon Product Advertising API
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ulletin
Bulletin No.: 21-NA-281 INFORMATION Subject: Diagnostic Tip – Transmission Neutral Service Mode
Date: December, 2021 This bulletin replaces PIT5764B. Please discard PIT5764B.
Brand:
Model:
VIN:
ne: from to from to
Transmission: (Automatic)
4 Chevrolet GMC CT5
Escalade Models
Suburban Tahoe
Yukon Models
RPO MQA RPO MHS RPOs MHS, MQC Involved Region or Country Condition Diagnostic Information North America
Certain service procedures or scenarios may require the transmission to be shifted into Neutral so that the vehicle can be moved or to complete a repair.
Vehicles equipped with an internal Electronic Transmission Range Select (ETRS) system require hydraulic pressure to disengage the park mechanism. Please follow the information listed below when trying to place the transmission into Neutral.
Correction In cases where the engine can be started – Refer to the Neutral Service Mode document in SI (example Document ID # 5286309).
5641294 Page 2 December, 2021 Bulletin No.: 21-NA-281
5710077
In cases of an ETRS system fault or a no start condition
– If the vehicle needs to be moved, it is recommended to use wheel dollies, tire skates (example shown above) or the NEW Manual Park Release tool
DT-52910 shown above (1). The manual park release tool is available through the GM Special Service Tools website. This new tool will allow the transmission to be manually shifted to neutral, see example SI doc ID 5620825. The manual park release tool can be installed to temporarily shift the vehicle into Neutral when the engine is not running.
Warning: The transmission will be placed in
N (Neutral) when the manual park release is pulled. The vehicle can roll on you or others could be injured. Ensure the vehicle is on level ground, parking brake applied, and wheels blocked prior to installation of the manual park release.
Warning: If fuel system is opened the fuel pump should be disabled using the Fuel Pressure Relief, Alternate Method by the removing the B+ fuel pump control module fuse. Using the Fuel Pressure Relief, Scan Tool Method will allow the fuel pump to build pressure if the ignition is placed to run. See Fuel Pressure Relief in Service Information for complete instructions.
Caution: If the manual park release is pulled while the vehicle is on or if the ignition is turned on while the manual park release is pulled, the DIC will display a message to service the transmission.
Caution: The latching mechanism in the manual park release lever will release if the vehicle is started and placed in Park. An attempt to override this function or use of an un-approved tool may cause internal damage to the transmission.
Version 1 Modified Released November 30, 2021 Additional SI Keywords: tow, towing, haul, wrecker, truck
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.
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