# Service bulletin PIT3665L

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: 10226382
- Published by NHTSA: 2022\-11\-21
- Manufacturer's number: PIT3665L
- Manufacturer's date: 2022\-10\-18
- NHTSA component: SERVICE 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

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2022/MC-10226382-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2022/MC-10226382-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Brakes

## Vehicles listed

- 2001 to 2004 CADILLAC ESCALADE
- 1998 to 2005 CHEVROLET ASTRO
- 2002 to 2004 CHEVROLET AVALANCHE 1500
- 2022 CHEVROLET EQUINOX
- 1998 to 2021 CHEVROLET EXPRESS
- 2023 CHEVROLET EXPRESS 2500
- 2023 CHEVROLET EXPRESS 3500
- 1998 CHEVROLET SILVERADO 1500
- 1999 to 2023 CHEVROLET SILVERADO 1500
- 2001 to 2005 CHEVROLET SILVERADO 1500 HD
- 1998 CHEVROLET SILVERADO 2500
- 1999 to 2023 CHEVROLET SILVERADO 2500
- 1998 CHEVROLET SILVERADO 2500 HD
- 1999 CHEVROLET SILVERADO 2500 HD
- 1998 CHEVROLET SILVERADO 3500
- 1999 to 2023 CHEVROLET SILVERADO 3500
- 2001 to 2004 CHEVROLET SUBURBAN
- 2016 to 2019 CHEVROLET SUBURBAN
- 2001 to 2004 CHEVROLET TAHOE
- 1998 to 2005 GMC SAFARI
- 1998 to 2023 GMC SAVANA
- 1998 to 2023 GMC SIERRA 1500
- 2001 to 2005 GMC SIERRA 1500 HD
- 1998 to 2023 GMC SIERRA 2500
- 1998 to 2023 GMC SIERRA 3500
- 2001 to 2004 GMC YUKON
- 2003 to 2007 HUMMER H2

## Recalls for the same vehicles and component

- [25V768000](/recalls/nhtsa/25V768000.md), 2025-11-06: SERVICE BRAKES, HYDRAULIC:POWER ASSIST
- [25V390000](/recalls/nhtsa/25V390000.md), 2025-06-12: SERVICE BRAKES, HYDRAULIC:BRAKE FLUID LOW WARNING:SWITCH/SENSOR/FLOAT
- [2024543](/recalls/tc/2024543.md), 2024-09-19: Brakes
- [24V702000](/recalls/nhtsa/24V702000.md), 2024-09-19: SERVICE BRAKES, HYDRAULIC:POWER ASSIST:HYDRAULIC:HOSES, LINES/PIPING, AND FITTINGS
- [24V674000](/recalls/nhtsa/24V674000.md), 2024-09-12: SERVICE BRAKES, HYDRAULIC:POWER ASSIST:ELECTRIC:CONTROL MODULE:SOFTWARE; SERVICE BRAKES, HYDRAULIC:BRAKE FLUID LOW WARNING: LAMP
- [2021602](/recalls/tc/2021602.md), 2021-09-29: Brakes
- [21V758000](/recalls/nhtsa/21V758000.md), 2021-09-29: SERVICE BRAKES, HYDRAULIC:POWER ASSIST:ELECTRIC:CONTROL MODULE
- [2020459](/recalls/tc/2020459.md), 2020-10-01: Brakes
- [20V603000](/recalls/nhtsa/20V603000.md), 2020-10-01: SERVICE BRAKES, HYDRAULIC:POWER ASSIST:VACUUM
- [2020079](/recalls/tc/2020079.md), 2020-02-27: Brakes

## Other bulletins for the same vehicles and component

- [23\-NA\-201](/bulletins/11024378.md), 2025-10-21, Service bulletin: SERVICE BRAKES; ELECTRICAL SYSTEM; STEERING. 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\-065](/bulletins/11017173.md), 2025-04-24, Service bulletin: STEERING; SERVICE BRAKES; FUEL/PROPULSION SYSTEM. This informational bulletin instructs the tech when fuel/fluid is needed to be tested and where it can be sent for analysis.
- [24\-NA\-048](/bulletins/11014277.md), 2025-02-17, Service bulletin: FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING; SERVICE BRAKES. This service bulletin provides customer information for rear unwanted automatic braking, usually when reversing out of a garage or driveway.
- [21\-NA\-043](/bulletins/11014230.md), 2025-02-12, Service bulletin: VISIBILITY/WIPER; SERVICE BRAKES; ENGINE; ELECTRICAL SYSTEM; WHEELS. 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\-019](/bulletins/11014138.md), 2025-02-11, Service bulletin: WHEELS; VEHICLE SPEED CONTROL; AIR BAGS; ELECTRICAL SYSTEM; SERVICE BRAKES. This bulletin advises the tech to check other areas that may need repair before replacing the wheel speed sensor.
- [21\-NA\-155](/bulletins/11013242.md), 2025-01-30, Service bulletin: SERVICE BRAKES; ELECTRICAL SYSTEM. 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.
- [24\-NA\-073](/bulletins/11013031.md), 2025-01-23, Service bulletin: SERVICE BRAKES. This technical bulletin provides a procedure to inform drivers that under certain driving conditions such as hilly or mountainous roads accompanied with frequent braking, that the original equipment front brake pads may wear prematurely.
- [PIT5828D](/bulletins/11012938.md), 2025-01-20, Service bulletin: SERVICE BRAKES. 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.
- [PIT6134G](/bulletins/11012932.md), 2025-01-20, Service bulletin: SERVICE BRAKES. This Preliminary information communicates an issue with premature brake pad life and engineering is working on release new pad lining material.
- [PIT6134F](/bulletins/11012247.md), 2025-01-03, Service bulletin: SERVICE BRAKES. This Preliminary information communicates an issue with premature brake pad life and engineering is working on release new pad lining material.

JSON: [/v1/bulletins/10226382](/v1/bulletins/10226382)

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