# Service bulletin 12050C

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: 10089972
- Published by NHTSA: 2017\-01\-31
- Manufacturer's number: 12050C
- Manufacturer's date: 2015\-05\-01
- NHTSA component: SUSPENSION:REAR:AXLE:NON\-POWERED AXLE ASSEMBLY

## NHTSA's summary

12050C \- CUSTOMER SATISFACTION PROGRAM \(REVISED EXPIRATION DATE, EXTENDED TO 4/30/16\). CERTAIN 2011\-2012 MODEL YEAR CHEVROLET EXPRESS AND GMC SAVANA VEHICLES, AND CHEVROLET SILVERADO AND SUBURBAN, AND GMC SIERRA AND YUKON XL 2500 SERIES VEHICLES, ALL EQUIPPED WITH A 10.5" REAR AXLE, MAY HAVE A CONDITION IN WHICH THE REAR AXLE RIGHT\-HAND SIDE BEARING ADJUSTER CLIP AND BOLT MAY COME LOOSE WITHIN THE REAR AXLE. IF THIS OCCURS, A GRINDING NOISE AND A VEHICLE VIBRATION WOULD BE NOTICEABLE WHEN THE VEHICLE IS IN MOTION. IF THE ADJUSTOR OR BOLT PUNCTURES THE DIFFERENTIAL COVER PAN, A FLUID LEAK COULD DEVELOP. IF ENOUGH FLUID WERE TO LEAK OUT, THE DRIVER MAY HEAR INCREASING NOISE, ADDITIONAL VEHICLE VIBRATION, AND SMELL BURNT AXLE LUBRICANT. IF THE DRIVER IGNORES THESE WARNINGS AND CONTINUES TO DRIVE THE VEHICLE, A SLOW LOSS OF VEHICLE MOTION COULD OCCUR. DEALERS ARE TO INSPECT AND, IF NECESSARY, REPAIR THE REAR AXLE.

## 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

Suspension

## Vehicles listed

- 2011 to 2012 CHEVROLET EXPRESS
- 2011 to 2012 CHEVROLET SILVERADO 1500
- 2011 to 2012 CHEVROLET SILVERADO 2500
- 2011 to 2012 CHEVROLET SILVERADO 3500
- 2011 to 2012 GMC SAVANA
- 2011 to 2012 GMC SIERRA 1500
- 2011 to 2012 GMC SIERRA 2500
- 2011 to 2012 GMC SIERRA 3500
- 2011 GMC YUKON XL
- 2012 GMC YUKON XL

## Recalls for the same vehicles and component

- [11V007000](/recalls/nhtsa/11V007000.md), 2011-01-06: SUSPENSION:REAR:AXLE:SPINDLE
- [2010454](/recalls/tc/2010454.md), 2010-12-17: Suspension
- [10V643000](/recalls/nhtsa/10V643000.md), 2010-12-17: SUSPENSION:REAR:AXLE:SPINDLE

## Other bulletins for the same vehicles and component

- [05\-03\-08\-002J](/bulletins/11007936.md), 2024-09-20, Service bulletin: SUSPENSION. This service bulletin provides information to dealership personnel on diagnosis and replacement of shock absorber and strut due to fluid leak.
- [05\-03\-08\-002J](/bulletins/11007935.md), 2024-09-20, Service bulletin: SUSPENSION. This service bulletin provides information to dealership personnel on diagnosis and replacement of shock absorber and strut due to fluid leak.
- [10\-03\-10\-001G](/bulletins/11001766.md), 2024-06-18, Service bulletin: WHEELS; SUSPENSION. This informational bulletin provides information on Wheel Balancer Mounting Instructions.
- [15\-00\-89\-004G](/bulletins/11000119.md), 2024-05-15, Service bulletin: ENGINE; SUSPENSION; POWER TRAIN. This service bulletin provides technicians with information to help identify the differences between what is considered a fluid leak, and what is considered fluid seepage.
- [PI0430B](/bulletins/10254209.md), 2024-05-06, Service bulletin: ELECTRONIC STABILITY CONTROL:AUTOMATIC \(ASC\); ELECTRICAL SYSTEM; SUSPENSION. Magnetically Controlled Suspension Electrical Connector Not Seated.
- [PIT5052D](/bulletins/10247705.md), 2023-12-26, Service bulletin: WHEELS; SUSPENSION; STEERING. Steering Wheel Vibration Or Customers Looking To Add Steering Stabilizer.
- [PIT5049A](/bulletins/10247704.md), 2023-12-26, Service bulletin: SUSPENSION. Rattle Squeak Clunk Bump Noise From Front Suspension.
- [PIT4954C](/bulletins/10247693.md), 2023-12-26, Service bulletin: SUSPENSION. Suspension.
- [PIT5214F](/bulletins/10247352.md), 2023-12-18, Service bulletin: SUSPENSION. This Preliminary Information communication provides information to the technician about vehicles that have had multiple repair attempts that are being performed on customer?s vehicles that exhibit vibration conditions without utilizing the support of General Motors Technical Assistance Center. If valid vibration frequency or Road Force Variation data has been collected and a repair attempt does not correct the customer complaint, contact General Motors Technical Assistance Center for further support. For any vehicles that remains unrepaired after being at the dealer for three days or more and a related bulletin or PI is not found, contact General Motors Technical Assistance Center for further support.
- [PIT5120A](/bulletins/10247065.md), 2023-12-11, Service bulletin: SUSPENSION; SUSPENSION: ADJUSTMENT:AUTOMATIC ELECTRICAL/HYDRAULIC. Stabilitrak/Traction Control OFF With Red Brake Warning Lamp

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