# Service bulletin PIT\-3665\-D

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: 10078876
- Published by NHTSA: 2016\-08\-24
- Manufacturer's number: PIT\-3665\-D
- Manufacturer's date: 2016\-05\-11
- NHTSA component: SERVICE BRAKES, HYDRAULIC:PEDALS AND LINKAGES

## 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

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

## Components

Brakes

## Vehicles listed

- 2001 to 2005 CADILLAC ESCALADE
- 2003 to 2005 CADILLAC ESCALADE ESV
- 2002 to 2005 CADILLAC ESCALADE EXT 1500
- 1998 to 2005 CHEVROLET ASTRO
- 2002 to 2004 CHEVROLET AVALANCHE 1500
- 1998 to 2016 CHEVROLET EXPRESS
- 1998 CHEVROLET SILVERADO 1500
- 1999 to 2016 CHEVROLET SILVERADO 1500
- 2001 to 2005 CHEVROLET SUBURBAN
- 2001 to 2005 CHEVROLET TAHOE
- 2001 to 2003 GMC DENALI
- 1998 to 2005 GMC SAFARI
- 1998 to 2005 GMC SAFARI \(GMC\)
- 1998 to 2016 GMC SAVANA
- 1998 to 2016 GMC SIERRA 1500
- 2001 to 2004 GMC YUKON
- 2001 to 2004 GMC YUKON DENALI
- 2002 HUMMER H2
- 2003 to 2007 HUMMER H2

## Recalls for the same vehicles and component

- [24V702000](/recalls/nhtsa/24V702000.md), 2024-09-19: SERVICE BRAKES, HYDRAULIC:POWER ASSIST:HYDRAULIC:HOSES, LINES/PIPING, AND FITTINGS
- [2019533](/recalls/tc/2019533.md), 2019-10-24: Brakes
- [19V761000](/recalls/nhtsa/19V761000.md), 2019-10-24: SERVICE BRAKES; SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:WHEEL SPEED SENSOR/TONE RING; ELECTRONIC STABILITY CONTROL \(ESC\)
- [19V645000](/recalls/nhtsa/19V645000.md), 2019-09-06: SERVICE BRAKES, HYDRAULIC:POWER ASSIST:VACUUM
- [2019324](/recalls/tc/2019324.md), 2019-06-28: Brakes
- [2018464](/recalls/tc/2018464.md), 2018-08-31: Brakes
- [18V578000](/recalls/nhtsa/18V578000.md), 2018-08-30: SERVICE BRAKES, HYDRAULIC:PEDALS AND LINKAGES
- [16V069000](/recalls/nhtsa/16V069000.md), 2016-02-05: SERVICE BRAKES, HYDRAULIC:PEDALS AND LINKAGES
- [2016053](/recalls/tc/2016053.md), 2016-02-04: Brakes
- [2015352](/recalls/tc/2015352.md), 2015-08-05: Brakes

## Other bulletins for the same vehicles and component

- [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.
- [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.
- [21\-NA\-043](/bulletins/11011709.md), 2024-12-10, Service bulletin: STRUCTURE:BODY; WHEELS; ENGINE; SERVICE BRAKES; UNKNOWN OR OTHER. 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.
- [PIT5282G](/bulletins/11007761.md), 2024-09-13, Service bulletin: SERVICE BRAKES. This Preliminary Information communication provides information to the technician that a customer may request the factory Integrated Trailer Brake Control be bypassed and their aftermarket trailer brake controller be installed instead. Technician will need to gain access to the body harness. Install trailer brake controller harness General Motors part number 23184088 into Middle Bus Electrical Center \(X61A\).
- [PIT5509L](/bulletins/11007691.md), 2024-09-11, Service bulletin: SERVICE BRAKES. This Preliminary Information communication provides information to the technician on how to diagnose and repair vehicle that may have a "Check Trailer Wiring" or "Service Trailer Brake System” message on the Driver Information Center when a trailer is connected to the vehicle. Diagnostic Trouble Code C1114 set in the Chassis Control Module. Chassis Control Module has to determine the type of trailer brake system that is being used. The Chassis Control Module can be sensitive to a variety of trailer wiring issues. The technician will need to make a trailer tester using Electric Trailer Brake Magnets and 7\-way trailer connector to determine if it is a vehicle or trailer issue. If the concern is not duplicated with the tester installed, the vehicle is operating correctly and the focus should be on the trailer wiring or 7 way connector.
- [PIT6212](/bulletins/11007686.md), 2024-09-11, Service bulletin: SERVICE BRAKES. This Preliminary information communicates an issue with the Hydrastar Electric Over Hydraulic trailer brake system causing a voltage spike into the trucks electrical system which is causing DTC C1114 to set.
- [PIP5596A](/bulletins/10253061.md), 2024-04-15, Service bulletin: SERVICE BRAKES; FUEL SYSTEM, GASOLINE. This Preliminary information communicates that when removing the fuel line jumper hose care should be taken to be sure the line is reinstalled correctly to avoid a no/low fuel pressure situation.
- [PIT5479F](/bulletins/10251685.md), 2024-03-18, Service bulletin: SERVICE BRAKES. This Preliminary Information communication provides information to the technician about fluid leaking from the brake caliper piston area found during a service of the vehicle. The substance is actually excess assembly grease from the caliper boot and piston installation. This grease can be cleaned off and the rest of the service completed.
- [22860](/bulletins/10248438.md), 2024-01-08, Service bulletin: ELECTRICAL SYSTEM:WIRING; SERVICE BRAKES. Harness Trapped Under MBEC
- [PIT5120A](/bulletins/10247720.md), 2023-12-26, Service bulletin: SERVICE BRAKES. Stabilitrak/Traction Control OFF With Red Brake Warning Lamp

JSON: [/v1/bulletins/10078876](/v1/bulletins/10078876)

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