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Service bulletin PIT3665J

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10178353
Published by NHTSA2020-08-10
Manufacturer's numberPIT3665J
Manufacturer's date2020-06-26
NHTSA componentSERVICE BRAKES

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

Brakes

Vehicles listed
CADILLAC ESCALADE2001, 2002, 2003, 2004
CHEVROLET ASTRO1998 to 2005
CHEVROLET AVALANCHE 15002002, 2003, 2004 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET EXPRESS1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020
CHEVROLET SILVERADO 15001998
CHEVROLET SILVERADO 15001999, 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 15002017, 2018, 2019 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET SILVERADO 25002015, 2016 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET SILVERADO 25002020 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET SUBURBAN2001, 2002, 2003, 2004
CHEVROLET SUBURBAN2016, 2017, 2018, 2019
CHEVROLET TAHOE2001, 2002, 2003, 2004
GMC SAFARI1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
GMC SAVANA1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020
GMC SIERRA 15001998 (the catalog's model; the bulletin names a series or trim of it)
GMC SIERRA 15002006, 2007, 2008, 2009, 2010 (the catalog's model; the bulletin names a series or trim of it)
GMC SIERRA 15002012, 2013, 2014 (the catalog's model; the bulletin names a series or trim of it)
GMC SIERRA 15002017, 2018, 2019 (the catalog's model; the bulletin names a series or trim of it)
GMC SIERRA 25002000 (the catalog's model; the bulletin names a series or trim of it)
GMC SIERRA 25002003, 2004, 2005 (the catalog's model; the bulletin names a series or trim of it)
GMC SIERRA 25002015, 2016 (the catalog's model; the bulletin names a series or trim of it)
GMC SIERRA 25002020 (the catalog's model; the bulletin names a series or trim of it)
GMC SIERRA 35001999 (the catalog's model; the bulletin names a series or trim of it)
GMC SIERRA 35002001, 2002 (the catalog's model; the bulletin names a series or trim of it)
GMC SIERRA 35002011 (the catalog's model; the bulletin names a series or trim of it)
GMC YUKON2001, 2002, 2003, 2004
HUMMER H22003, 2004, 2005, 2006, 2007

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
25V7680002025-11-06. SERVICE BRAKES, HYDRAULIC:POWER ASSIST
25V3900002025-06-12. SERVICE BRAKES, HYDRAULIC:BRAKE FLUID LOW WARNING:SWITCH/SENSOR/FLOAT
20245432024-09-19. Brakes
24V7020002024-09-19. SERVICE BRAKES, HYDRAULIC:POWER ASSIST:HYDRAULIC:HOSES, LINES/PIPING, AND FITTINGS
20204592020-10-01. Brakes
20V6030002020-10-01. SERVICE BRAKES, HYDRAULIC:POWER ASSIST:VACUUM
20200792020-02-27. Brakes
20V1160002020-02-27. SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:DISC:CALIPER
20200342020-01-30. Brakes
20V0550002020-01-30. SERVICE BRAKES, HYDRAULIC:POWER ASSIST

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
23-NA-2012025-10-21. 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.
25-NA-0652025-04-24. Service bulletin. This informational bulletin instructs the tech when fuel/fluid is needed to be tested and where it can be sent for analysis.
21-NA-0432025-02-12. Service bulletin. This bulletin advises the dealers to maintain the vehicle stock on hand by doing a full inspection on the vehicles before being sold (prepping) to the customer.
25-NA-0192025-02-11. Service bulletin. This bulletin advises the tech to check other areas that may need repair before replacing the wheel speed sensor.
21-NA-1552025-01-30. Service bulletin. This informational bulletin advises the technician to check for faults that may be caused by the trailer otherwise found by a possible faulty trailer connector.
PIT5828D2025-01-20. Service bulletin. This Preliminary Information communication provides information to the technician about customers that may request the factory Integrated Trailer Brake Controller Regular Production Option Code (JL1) be installed on their Full-Size Pickup or SUV when the vehicle was not ordered with the option. Dealer should advise the customer it cannot be added to the vehicle.
PIT6134G2025-01-20. Service bulletin. This Preliminary information communicates an issue with premature brake pad life and engineering is working on release new pad lining material.
21-NA-0432024-12-10. Service bulletin. This bulletin advises the dealers to maintain the vehicle stock on hand by doing a full inspection on the vehicles before being sold (prepping) to the customer.
PIT6134E2024-12-05. Service bulletin. This Preliminary information communicates an issue with premature brake pad life and engineering is working on release new pad lining material.
21-NA-0892024-12-04. Service bulletin. This technical bulletin provides a procedure to replace the rear calipers if found packed for of mud and debris.