Service Bulletin Date: February, 2014 - National Highway Traffic Safety .

SB-10043845-3346File in Section:Service Bulletin07 - Transmission/TransaxleBulletin No.:09-07-30-004JDate:February, 2014TECHNICALSubject:Slips in Reverse or Third, Delayed Reverse or Drive Engagement, DTC P0776, P2715,P2723, Harsh 2-3 Shifts (Inspect 1-2-3-4 / 3-5-R Housing and Pump Seal Rings)Models:2006-2009 Cadillac STS-V, XLR, XLR-V2007-2008 Cadillac Escalade, Escalade ESV, Escalade EXT2006-2009 Chevrolet Corvette2007-2008 Chevrolet Silverado2008 Chevrolet Suburban2007-2008 GMC Sierra, Sierra Denali, Yukon Denali, Yukon XL Denali2008 GMC Yukon XL2008-2009 HUMMER H22008-2009 Pontiac G8Equipped with 6L80 or 6L90 Automatic Transmission (RPOs MYC, MYD)This bulletin has been revised to update the 2006-2009 Vehicles correction section andupdate the Labor Operation to the Global Labor Code (GLC). Please discard CorporateBulletin Number 09-07-30-004I.Condition2006-2008 VehiclesSome customers may comment on any of the followingconditions: Slip when Reverse is selected or no reverse. Delayed engagement into reverse. MIL illuminated. DTCs P0776, P2715 or P2723are found as an active or a history code inthe TCM. Harsh shifts from second to third. Harsh shifts from fourth to fifth or slips in fifth. Slips on acceleration when passing.CauseCopyright 2014 General Motors LLC. All Rights Reserved.This condition may be caused by a cracked 1-2-3-4 /3-5-R clutch housing.CorrectionImportant: If a cracked housing is identified, it must bereplaced. Complete, assembled 1-2-3-4 / 3-5-R clutchhousings are now available for most applications.These clutch housings come complete with all pistons,seals, clutches, bearing and internal parts. Noassembly of the clutch housing is required before it isinstalled. For applications without a complete,assembled 1-2-3-4 / 3-5-R clutch housing, individualparts must be ordered and the housing assembled inthe dealership.

Page 2February, 2014Bulletin No.: 09-07-30-004JHousing AssembledInspect the 1-2-3-4 / 3-5-R clutch housing for a possiblecracked weld. The housing can be inspected eitherassembled or disassembled.27153811. Apply soap compound to the weld area of thehousing.2. Hold your thumb over the air bleed passage.3. For a fully assembled 1-2-3-4 and 3-5 reverseclutch housing, spray compressed air into the 3-5Rclutch feed hole and inspect the weld area forbubbles.4. If bubbles are detected, a new housing is required.

Bulletin No.: 09-07-30-004JFebruary, 2014Page 3Housing DisassembledInspect the 1-2-3-4 / 3-5-R clutch housing for a possiblecracked weld.25395501. Apply soap compound to weld area of the housing.2. Hold your thumb over the air bleed passage.3. Spray compressed air into the housing and inspectthe weld area for bubbles.4. If bubbles are detected, a new housing is required.Important: The 6L80 transmission had a designchange to the 1-2-3-4 piston, 1-2-3-4 piston housingand the 3-5-R piston for the 2008 model year.Installation of a 2008, 6L80 complete housing assemblyinto a 2007 or older 6L80 may result in a 2-3 shift flareor 3-5-R clutch distress.Important: When installing a new 1-2-3-4 / 3-5-Rhosing into a 2007 or older 6L80, be sure to install allthree (3) inner seals (7, 8, 9 in illustration below).Failure to install these seals can result in no reverse, noforward or distressed clutches.

Page 4February, 2014Bulletin No.: 09-07-30-004J15553672006-2009 VehiclesA harsh 2-3 shift condition may be caused by leaking1-2-3-4 and 3-5-R clutch fluid seal rings (1) on thetransmission fluid pump cover assembly.2219005Inspect the fluid seal rings. Transmissions in 2006,2007, 2008 and early build 2009 models used a1- piece design seal ring in production. StartingDecember 2008, a 2-piece seal ring design wasimplemented. The 1-piece seal ring design may causea harsh 2-3 shift due to leakage. This is typically a lowmileage issue. If the seal rings are a 1-piece designthey should be replaced with new 1-piece design sealrings. It is not necessary to replace the pump cover.Notice: The clutch fluid seal rings must be installed ina specific way. Failure to install new clutch fluid sealrings in the proper orientation may cause a repeatharsh 2-3 shift. Refer to 1-2-3-4 and 3-5 Reverse ClutchFluid Seal Ring Installation (6L80/90) in SI for correctinstallation.If the seals are the 2-piece design shown below, theydo not need to be replaced unless they are worn ordamaged.Important: Do not install 1-piece design seal rings ona 2-piece seal ring design pump cover. The 2-pieceseal ring design pump cover can be identified by thenotch in the seal ring grooves that accepts the tab onthe 2-piece design seal rings.

Bulletin No.: 09-07-30-004JFebruary, 2014Page 5Parts InformationPart NumberDescription24238694Clutch, 1-2-3-4 & 3-5-R (MYC) 2008 –Complete with housing, all pistons, seals,clutches, bearing and internal parts24238695Clutch, 1-2-3-4 & 3-5-R (MYD) 2007,2008 – Complete with housing, allpistons, seals, clutches, bearing andinternal parts24248581Ring kit, 1-2-3-4 & 3-5-R Clutch FluidSeal (1-piece design seal rings, if neededas determined by inspection above)Refer toAppropriateParts CatalogComplete Assembled 1-2-3-4 & 3-5-RClutch Housings (MYC) 2006-2007 arenot available. Individual parts must beordered and the housing assembled inthe dealership.24260606Tube, Transmission Fluid Fill - 2007-2008C/K Truck (MYC)2475192Important: For full size trucks equipped with 6L80(MYC), any time the transmission is removed, install arevised fluid fill tube as shown below if it is not alreadypresent. This fill tube incorporates a damper near thetop of the tube that prevents resonance relateddamage.Warranty InformationFor vehicles repaired under warranty, everse Clutch 999GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform thesetechnicians of conditions that may occur on some vehicles, or to provide information that could assist in the properservice of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do ajob properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that yourvehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from theinformation.WE SUPPORT VOLUNTARYTECHNICIANCERTIFICATION

1-2-3-4 and 3-5-R clutch fluid seal rings (1) on the transmission fluid pump cover assembly. 2219005. Inspect the fluid seal rings. Transmissions in 2006, 2007, 2008 and early build 2009 models used a 1- piece design seal ring in production. Starting December 2008, a 2-piece seal ring design was implemented. The 1-piece seal ring design may cause