# Service bulletin PIT\-4056

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: 10022691
- Published by NHTSA: 2007\-09\-20
- Manufacturer's number: PIT\-4056
- Manufacturer's date: 2012\-02\-01
- Replaces: PIT\-4056G
- NHTSA component: SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE; SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE

## NHTSA's summary

GMC: UNABLE TO COMMUNICATE WITH THE EBCM DTC U0121. \*NJ VEHICLES EQUIPPED WITH JL4. UPDATED 9/30/08. \*PE UPDATED 6/27/11. \*PE UPDATED 4/6/12. \*PE

## 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, Anti\-lock brakes

## Trouble codes named

U0121

## Vehicles listed

- 2007 to 2008 CADILLAC ESCALADE
- 2008 to 2009 CADILLAC ESCALADE ESV
- 2008 to 2009 CADILLAC ESCALADE EXT
- 2007 to 2009 CHEVROLET AVALANCHE
- 2007 to 2008 CHEVROLET AVALANCHE 1500
- 2011 CHEVROLET AVALANCHE 1500
- 2007 CHEVROLET AVALANCHE 2500
- 2010 to 2011 CHEVROLET CAMARO
- 2007 CHEVROLET SILVERADO
- 2009 CHEVROLET SILVERADO
- 2007 to 2008 CHEVROLET SILVERADO 1500
- 2007 to 2008 CHEVROLET SILVERADO 2500
- 2007 to 2008 CHEVROLET SILVERADO 3500
- 2009 CHEVROLET SUBURBAN
- 2007 to 2008 CHEVROLET SUBURBAN 1500
- 2008 CHEVROLET SUBURBAN 2500
- 2007 to 2009 CHEVROLET TAHOE
- 2009 to 2011 CHEVROLET TRAVERSE
- 2008 GMC SIERRA
- 2007 to 2008 GMC SIERRA 1500
- 2007 to 2008 GMC SIERRA 2500
- 2007 to 2008 GMC SIERRA 3500
- 2007 to 2008 GMC YUKON

## Other bulletins for the same vehicles and component

- [PIT3271J](/bulletins/10168960.md), 2019-12-09, Service bulletin: WHEELS; SERVICE BRAKES, AIR:ANTILOCK. This Preliminary Information communication provides information to the technician about changing the tire and wheel size on vehicles. General Motors will only support a tire calibration for tires that have been sized, tested and designed for the vehicle in question and its applications. Technician should not use the information that is provided by the antilock braking system tire size selection.
- [PIT4225F](/bulletins/10112551.md), 2017-08-15, Service bulletin: SERVICE BRAKES, AIR:ANTILOCK; SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP; SERVICE BRAKES, ELECTRIC. This Preliminary Information communication provides information to the technician about vehicles that have an Antilock Braking System lamp followed by a Service Stability message in the Drivers Information Center. Technician my find Diagnostic Trouble Code C0710 set in the Electronic Brake Control Module. Technician may or may not find Diagnostic Trouble Code C0455. Technician will need to ensure the steering wheel is properly installed to the steering shaft.
- [PIC5432D](/bulletins/10112310.md), 2017-08-15, Service bulletin: ELECTRICAL SYSTEM; SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE; SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE. This Preliminary Information communication provides information to the technician about vehicles that have an intermittent Service Stabilitrak message being displayed in the Driver Information Center only at startup and that the message is gone within seconds of starting the engine. On model year vehicles 2010 through 2012 technician will reprogram the Electronic Brake Control Module with the latest calibrations in Tis2Web.
- [PIC5428F](/bulletins/10112074.md), 2017-08-15, Service bulletin: SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP; SERVICE BRAKES, AIR:ANTILOCK; SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE; SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE. This Preliminary Information communication provides information to the technician on how to diagnose and repair vehicles that may have the Antilock Braking System, Service Traction Control System, and/or Service Stabilitrak lights are on. The Electronic Brake Control Module may have one or more of the following Diagnostic Trouble Codes C0035\-C0050 with specifically symptom 18, 5A, or 0F. Technician will gain access to the correct wheel bear per the Diagnostic Trouble Code that is set. If debris is found on the magnetic encoder ring it will needed to be cleaned.
- [PIC5428G](/bulletins/10080901.md), 2016-09-23, Service bulletin: TRACTION CONTROL SYSTEM; SERVICE BRAKES, AIR:ANTILOCK:WHEEL SPEED SENSOR; SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:WHEEL SPEED SENSOR/TONE RING; SERVICE BRAKES, ELECTRIC. THIS PRELIMINARY INFORMATION COMMUNICATION PROVIDES INFORMATION TO THE TECHNICIAN ON HOW TO DIAGNOSE AND REPAIR VEHICLES THAT MAY HAVE THE ANTILOCK BRAKING SYSTEM, SERVICE TRACTION CONTROL SYSTEM, AND/OR SERVICE STABILITRAK LIGHTS ARE ON. THE ELECTRONIC BRAKE CONTROL MODULE MAY HAVE ONE OR MORE OF THE FOLLOWING DIAGNOSTIC TROUBLE CODES C0035\-C0050 WITH SPECIFICALLY SYMPTOM 18, 5A, OR 0F. TECHNICIAN WILL GAIN ACCESS TO THE CORRECT WHEEL BEAR PER THE DIAGNOSTIC TROUBLE CODE THAT IS SET. IF DEBRIS IS FOUND ON THE MAGNETIC ENCODER RING IT WILL NEEDED TO BE CLEANED.
- [PIC\-5515C](/bulletins/10052046.md), 2013-05-08, Service bulletin: SERVICE BRAKES, AIR:ANTILOCK:WHEEL SPEED SENSOR. GM: SOME VEHICLES MAY EXHIBIT A RATCHET, GRIND, OR ABS PUMP MOTOR NOISES AT THE FRONT OF THE VEHICLE. \*JS
- [PIC\-5551\-A](/bulletins/10043012.md), 2012-02-08, Service bulletin: TRACTION CONTROL SYSTEM; ELECTRONIC STABILITY CONTROL \(ESC\); SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:WHEEL SPEED SENSOR/TONE RING. CHEVROLET: SOME MODEL YEAR VEHICLES ARE EXPERIENCING A DROP/SPIKE IN SPEED ON ANY WHEEL SPEED SENSOR AFTER NOISE, RATCHET, GRIND, OR ABS PUMP MOTOR, WAS HEARD, FROM FRONT OF VEHICLE. \*PE
- [PIP\-4966](/bulletins/10042386.md), 2011-12-06, Service bulletin: ELECTRICAL SYSTEM; SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:ABS WARNING LIGHT; SERVICE BRAKES, AIR:ANTILOCK:ABS WARNING LIGHT; ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. CHEVROLET/CADILLAC/GMC: CERTAIN VEHICLES EXPERIENCING ERRATIC OR INOPERATIVE SPEEDOMETER OR ANTI\-LOCK BRAKE SYSTEM MESSAGE OR MALFUNCTIONING INDICATOR LIGHT DISPLAYING IN DRIVER'S INFORMATION CENTER. \*PE UPDATED 08/5/2013 \*JS
- [PIC\-5428](/bulletins/10038468.md), 2011-06-15, Service bulletin: SERVICE BRAKES, AIR:ANTILOCK:WHEEL SPEED SENSOR; SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:WHEEL SPEED SENSOR/TONE RING. GM: THE BRAKE, TRACTION, OR STABILITY LIGHTS ARE ON BECAUSE OF DEBRIS STUCK ON THE WHEEL SPEED SENSOR. UPDATED ON 06/15/2011. \*KB UPDATED ON 06/20/2011. \*RM UPDATED 6/27/11. \*PE UPDATED 10/3/11. \*PE UPDATED 05/08/2013 \*JS UPDATED ON 7/9/2013. \*KB UPDATED 7/28/14. \*PE
- [PI\-0097A](/bulletins/10036514.md), 2011-03-26, Service bulletin: ELECTRICAL SYSTEM:STARTER ASSEMBLY; STEERING; SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:ABS WARNING LIGHT; ELECTRONIC STABILITY CONTROL:AUTOMATIC \(ASC\). GMC/SATURN/BUICK/CHEVROLET: INTERMITTENT NO CRANK/NO START; SECURITY LIGHT ON; ANTILOCK BRAKE SYSTEM \(ABS\) WARNING LIGHT ON; STABILITRAK INDICATOR LIGHT ON/SERVICE STABILITRAK MESSAGE DISPLAYED IN DIC; INCREASED STEERING EFFORT. \*PE UPDATED 3/28/11. \*PE UPDATED 3/30/11. \*PE

JSON: [/v1/bulletins/10022691](/v1/bulletins/10022691)

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