Service bulletin PIT3665M
A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.
| Type | Service bulletin |
|---|---|
| NHTSA id | 10237671 |
| Published by NHTSA | 2023-06-13 |
| Manufacturer's number | PIT3665M |
| Manufacturer's date | 2023-05-19 |
| NHTSA component | ELECTRICAL SYSTEM: INTEGRATED TRAILER BRAKE CONTROL |
NHTSA's summary
This Preliminary Information communication advises the technician that the Hydro-Boost is not serviceable and will need to be replaced if the brake pedal moves or applies on its own at a full turn.
The document
The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.
Components
Electrical system
| CADILLAC ESCALADE | 2001, 2002, 2003, 2004 |
|---|---|
| CHEVROLET ASTRO | 1998 to 2005 |
| CHEVROLET AVALANCHE 1500 | 2002, 2003, 2004 (the catalog's model; the bulletin names a series or trim of it) |
| CHEVROLET EQUINOX | 2022 |
| CHEVROLET EXPRESS | 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021 |
| CHEVROLET EXPRESS 3500 | 2023 (the catalog's model; the bulletin names a series or trim of it) |
| CHEVROLET SILVERADO 1500 | 1998 |
| CHEVROLET SILVERADO 1500 | 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014 (the catalog's model; the bulletin names a series or trim of it) |
| CHEVROLET SILVERADO 1500 | 2017, 2018, 2019 (the catalog's model; the bulletin names a series or trim of it) |
| CHEVROLET SILVERADO 1500 | 2021 (the catalog's model; the bulletin names a series or trim of it) |
| CHEVROLET SILVERADO 1500 | 2023 (the catalog's model; the bulletin names a series or trim of it) |
| CHEVROLET SILVERADO 2500 | 2015, 2016 (the catalog's model; the bulletin names a series or trim of it) |
| CHEVROLET SILVERADO 2500 | 2020 (the catalog's model; the bulletin names a series or trim of it) |
| CHEVROLET SILVERADO 2500 | 2022 (the catalog's model; the bulletin names a series or trim of it) |
| CHEVROLET SILVERADO EV | 2024 (the catalog's model; the bulletin names a series or trim of it) |
| CHEVROLET SUBURBAN | 2001, 2002, 2003, 2004 |
| CHEVROLET SUBURBAN | 2016, 2017, 2018, 2019 |
| CHEVROLET TAHOE | 2001, 2002, 2003, 2004 |
| GMC SAFARI | 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005 |
| GMC SAVANA | 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023 |
| GMC SIERRA 1500 | 1998 (the catalog's model; the bulletin names a series or trim of it) |
| GMC SIERRA 1500 | 2006, 2007, 2008, 2009, 2010 (the catalog's model; the bulletin names a series or trim of it) |
| GMC SIERRA 1500 | 2012, 2013, 2014 (the catalog's model; the bulletin names a series or trim of it) |
| GMC SIERRA 1500 | 2017, 2018, 2019 (the catalog's model; the bulletin names a series or trim of it) |
| GMC SIERRA 1500 | 2021, 2022, 2023 (the catalog's model; the bulletin names a series or trim of it) |
| GMC SIERRA 2500 | 2000 (the catalog's model; the bulletin names a series or trim of it) |
| GMC SIERRA 2500 | 2003, 2004, 2005 (the catalog's model; the bulletin names a series or trim of it) |
| GMC SIERRA 2500 | 2015, 2016 (the catalog's model; the bulletin names a series or trim of it) |
| GMC SIERRA 2500 | 2020 (the catalog's model; the bulletin names a series or trim of it) |
| GMC SIERRA 3500 | 1999 (the catalog's model; the bulletin names a series or trim of it) |
| GMC SIERRA 3500 | 2001, 2002 (the catalog's model; the bulletin names a series or trim of it) |
| GMC SIERRA 3500 | 2011 (the catalog's model; the bulletin names a series or trim of it) |
| GMC SIERRA 3500 | 2024 (the catalog's model; the bulletin names a series or trim of it) |
| GMC YUKON | 2001, 2002, 2003, 2004 |
| HUMMER H2 | 2003, 2004, 2005, 2006, 2007 |
Listing a model year does not mean every vehicle of it is concerned: the document says which.
| 2024294 | 2024-05-24. Electrical |
|---|---|
| 24V320000 | 2024-05-09. ELECTRICAL SYSTEM:PROPULSION SYSTEM; ELECTRICAL SYSTEM:WIRING |
| 2023210 | 2023-04-06. Electrical |
| 23V247000 | 2023-04-06. ELECTRICAL SYSTEM:WIRING |
| 2021407 | 2021-07-01. Electrical |
| 2021166 | 2021-03-18. Electrical |
| 21V189000 | 2021-03-18. ELECTRICAL SYSTEM:12V/24V/48V BATTERY:CABLES |
| 2019631 | 2019-12-12. Electrical |
| 19V888000 | 2019-12-12. ELECTRICAL SYSTEM:12V/24V/48V BATTERY:CABLES |
| 19V644000 | 2019-09-06. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; SEAT BELTS:FRONT:WARNING LIGHT/DEVICES |
A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.
| N252529080 | 2026-04-01. Service campaign. Service Update. Certain vehicles listed above may be missing a high voltage header plug on the RESS battery pack drive motor connector. Dealers are to inspect the RESS pack connectors and install the proper HV Header Plug if missing. |
|---|---|
| N252515590 | 2026-01-27. Service campaign. Certain vehicles listed above, may have a condition in which the body-to-chassis ground strap may be corroded. Dealers will replace the ground strap. |
| 25-NA-119 | 2025-10-27. Service bulletin. This service bulletin provides information on the Service Safety Restraint Message displayed on the DIC Airbag malfunction indicator illuminated. |
| 25-NA-108 | 2025-10-27. Service bulletin. This bulletin provides a procedure to inspect and verify the drive shafts are over extending past the 5mm tolerance, causing the customers concern of a fluid leak under the vehicle. |
| 25-NA-044 | 2025-10-27. Service bulletin. This service bulletin provides information for dealers/technicians on SPS2 Hybrid/EV Battery Data Retrieval for Service High Voltage DTCs. |
| 24-NA-202 | 2025-10-27. Service bulletin. This service bulletin provides dealers with Warranty Administration information on North American Charging Standard (NACS) DC Adapter Warranty Claim Information. |
| 23-NA-202 | 2025-10-25. Service bulletin. This service bulletin provides information on High Voltage Drive Motor Battery - TAC Approval and Exchange Program for BrightDrop, Chevrolet Silverado EV, and GMC Sierra EV, HUMMER EV/SUV. |
| 23-NA-170 | 2025-10-25. Service bulletin. This bulletin advises the tech to inspect deeper into what may be to main cause of an engine failure. |
| 23-NA-201 | 2025-10-21. Service bulletin. This service bulletin advises the technician of a possible loose ground that may be causing customer concerns of Loss of Steering Assist and/or Loss of Brake Assist and Malfunction Indicator Lamp (MIL) Illuminated. |
| 18-NA-180 | 2025-10-16. Service bulletin. This Warranty Administration service bulletin provides Lithium-Ion battery Exchange Process and Transaction Submission information. |