# Service bulletin GCUS\-3\-861

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: 10126015
- Published by NHTSA: 2017\-12\-22
- Manufacturer's number: GCUS\-3\-861
- Manufacturer's date: 2017\-03\-06
- NHTSA component: PARKING BRAKE:DRIVELINE:HYDRAULIC:ACTUATOR

## NHTSA's summary

17048 Customer Satisfaction. Certain vehicles may have a condition in which the transfer case actuator motor brake sticks in the open position inside the transfer case actuator assembly. If 1\) the actuator motor brake sticks open, 2\) the vehicle is on asurface with an angle greater than zero but less than two degrees, 3\) the vehicle is parked in 4LO, 4\) the system is warm, and 5\) the vehicle ignition is turned ?Off,? there is potential for vehicle rollback due to the range fork slipping into neutral. The brake sticking condition will set diagnostic trouble code C0326 58 and a ?Service AWD? warning will appear on the driver information center. Dealers are to replace the transfer case actuator assembly.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2017/MC-10126015-9999.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2017/MC-10126015-0001.pdf)

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

## Components

Brakes, Parking brake

## Trouble codes named

C0326

## Vehicles listed

- 2017 CADILLAC ESCALADE
- 2017 CHEVROLET COLORADO
- 2017 CHEVROLET SILVERADO
- 2017 CHEVROLET SUBURBAN
- 2017 CHEVROLET TAHOE
- 2017 GMC CANYON
- 2017 GMC SIERRA
- 2017 GMC YUKON

## Other bulletins for the same vehicles and component

- [20\-NA\-207](/bulletins/10209097.md), 2022-03-16, Service bulletin: PARKING BRAKE:ELECTRICAL:CONTROL MODULE; ELECTRICAL SYSTEM; POWER TRAIN. This service bulletin informs the technician to inspect for a possible electrical concern at the ECM X2 electrical connector to correct a customer concern of Malfunction Indicator Lamp \(MIL\) Illuminated \- DTC P0333 Set.
- [19NA136](/bulletins/10186069.md), 2021-02-01, Service bulletin: PARKING BRAKE; EQUIPMENT; POWER TRAIN:TRANSFER CASE \(4\-WHEEL DRIVE\). This service bulletin provides a diagnostic procedure to aid in correcting a customer concern of a Howling, Whining/Whirring Noise, Shudder/Vibration and/or Grinding Noise While in 4HI, 4HI Auto and/or During Parking Lot Maneuvers in Auto Mode.
- [19NA137](/bulletins/10164119.md), 2019-08-26, Service bulletin: PARKING BRAKE:CONVENTIONAL:MECHANICAL:LINKAGE AND CABLE; EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY. This technical bulletin provides a procedure to add PET tape to the brake cables if the cause of the customers concern.
- [19NA137](/bulletins/10163253.md), 2019-07-29, Service bulletin: PARKING BRAKE:CONVENTIONAL:MECHANICAL:LINKAGE AND CABLE. This technical bulletin provides a procedure to add PET tape to the brake cables if the cause of the customers concern.
- [19NA035](/bulletins/10160125.md), 2019-05-20, Service bulletin: PARKING BRAKE:DRIVELINE:HYDRAULIC:ACTUATOR; PARKING BRAKE. This technical bulletin provides a procedure to validate if the parking pawl actuator is not working as intended, causing the parking pawl to engage while driving.
- [PIT5441C](/bulletins/10157027.md), 2019-04-08, Service bulletin: SERVICE BRAKES; EQUIPMENT; BACK OVER PREVENTION: SENSING SYSTEM: CAMERA; PARKING BRAKE; EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT:ELECTRICAL; LANE DEPARTURE. This Preliminary Information communication provides information to the technician the steps to diagnose and repair vehicles that may have an Object Detection System Message Diagnostic Trouble Codes U0075, U026A, U026B, U026C, U0265, U0268, and/or U0269 stored in the active safety module. Technician should inspect his Multiple Diagnostic Interface cable for damage. Technician should use the Multiple Diagnostic Interface on a like vehicle with object detection bus or theEL\-47955\-1 MDI 1, MDI 2 Self\-Test Loopback Adapter,if there are no issues found finish with diagnosing the customer\’s concern, if concern is present in the like vehicle replace the Multiple Diagnostic Interface cable.
- [PIT5507E](/bulletins/10141372.md), 2018-06-18, Service bulletin: PARKING BRAKE; ELECTRICAL SYSTEM. This Preliminary Information communication provides information to the technician about vehicles that may have a diagnostic trouble code U0159 set in the instrument panel cluster and/or the body control module. For vehicles equipped with Ultrasonic Park Assist System Regular Production Option Code UD5 or UD7 technician will use Service Programming System to reprogram the Parking Assist Control Module to correct this concern. Technician will need to inspect the front park assist sensors scallops/reliefs molded into the ring if previously replaced. Technician will need to replace the sensor rings with part number 84075328.
- [PI1410B](/bulletins/10137680.md), 2018-05-21, Service bulletin: PARKING BRAKE. This preliminary informational bulletin provides information regarding the normal characteristic of instrument panel red brake light intermittently comes on.
- [PIT5423A](/bulletins/10129087.md), 2018-02-21, Service bulletin: EXTERIOR LIGHTING; PARKING BRAKE. This Preliminary Information communication provides information to the technician on how to diagnose and repair vehicles that may have a intermittent no crank, crank no start, or Service Engine Soon Malfunction Indicator Lamp. The technician should inspect for a loose G102, G107 or G108 and repair as necessary. If no issue found, proceed with published Service Information diagnostics.
- [PIT5206E](/bulletins/10100046.md), 2017-05-22, Service bulletin: SERVICE BRAKES, HYDRAULIC:PEDALS AND LINKAGES; PARKING BRAKE; ELECTRICAL SYSTEM: INTEGRATED TRAILER BRAKE CONTROL; POWER TRAIN:AUTOMATIC TRANSMISSION; ENGINE. THIS PRELIMINARY INFORMATION COMMUNICATION PROVIDES INFORMATION TO THE TECHNICIAN WITH THE STEPS ON DIAGNOSING AND REPAIRING VEHICLES THAT MAY HAVE UNWANTED GRADE BRAKING, REDUCED ENGINE POWER WITH NO DRIVER INFORMATION CENTER MESSAGES “ BRAKE PEDAL OVERRIDE FEATURE “, TRANSMISSION BUSY OR FREQUENT SHIFTING UP OR DOWN, AND DIAGNOSTIC TROUBLE CODES P057B, P057C, AND/OR P057D MAY OR MAY NOT BE SET. TECHNICIAN WILL USE THIS PRELIMINARY INFORMATION TO FIND THE BRAKE PEDAL POSITION DATA PARAMETERS IN THE SCAN TOOL, AND ALSO TO PROVIDE SOME ADDITIONAL DIAGNOSTIC HELP. THESE ISSUES MAY BE CAUSED BY AN INCORRECT BRAKE PEDAL POSITION SENSOR INPUT TO THE ENGINE CONTROL MODULE. TECHNICIAN WILL VERIFY WITH THE SCAN TOOL IF THE ENGINE CONTROL MODULE HAS THE CORRECT PARAMETERS FOR THE BRAKE PEDAL POSITION SENSOR. IF AN ENGINE CONTROL MODULE BRAKE PEDAL POSITION SENSOR RELEARN IS PERFORMED, THE TRUCK MAY BE TEMPORARILY REPAIRED UNTIL THE INTERMITTENT WIRING ISSUE BETWEEN THE ENGINE CONTROL MODULE AND BRAKE PEDAL POSITION SENSOR OCCURS AGAIN. ON 2014 AND NEWER TRUCKS INSPECT AND REPAIR ANY DAMAGE TO X115 AND X119. ON THE 2014 AND PREVIOUS TRUCKS INSPECT AND REPAIR ANY DAMAGE TO X205.

JSON: [/v1/bulletins/10126015](/v1/bulletins/10126015)

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