VEHICLE: 2007 CADILLAC SRX BUILD DATE APPROXIMATELY APRIL 2007 PROBLEM: WHEEL LUG NUTS NOT STAYING TIGHT. HISTORY: ALL 24 LUG NUTS FOUND LOOSE OR FINGER TIGHT (ABLE TO BE REMOVED BY HAND WITH SOCKET BUT WITHOUT USING WRENCH) AT 3,500 MILES. TIGHTENED BY OWNER USING OWNER'S CALIBRATED/CERTIFIED TORQUE WRENCH AND RETURNED …
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VEHICLE: 2007 CADILLAC SRX BUILD DATE APPROXIMATELY APRIL 2007 PROBLEM: WHEEL LUG NUTS NOT STAYING TIGHT. HISTORY: ALL 24 LUG NUTS FOUND LOOSE OR FINGER TIGHT (ABLE TO BE REMOVED BY HAND WITH SOCKET BUT WITHOUT USING WRENCH) AT 3,500 MILES. TIGHTENED BY OWNER USING OWNER'S CALIBRATED/CERTIFIED TORQUE WRENCH AND RETURNED VEHICLE TO DEALER FOR INSPECTION. DEALER FOUND ALL LUG NUTS TIGHT. DEALER RETURNED CAR TO OWNER. NUTS RE-CHECKED AND FOUND LOOSE ON 3 WHEELS. RETURNED TO DEALER TO INSPECT AND TIGHTEN. DEALER FOUND ALL LUG NUTS TIGHT BUT BROKE ONE (1) WHEEL STUD OFF TIGHTENING LOOSE STUD BEFORE REACHING SPECIFIED TORQUE. DEALER RE-CHECKED THE PREVIOUSLY VERIFIED NUTS AND FOUND 3 NUTS ON ONE WHEEL AT LESS THAN THE PROPER TORQUE. NO SIGN OF WHEEL DAMAGE FOUND. ALL NUTS AND STUDS THREADED SMOOTHLY AND DID NOT APPEAR DAMAGED. NO EVIDENCE PAINT ACTED AS A SHIM THUS PREVENTING STUDS FROM ACHIEVING NECESSARY CLAMPING FORCE. CONCLUSION: DETERMINED PROBLEM IS NOT THAT THE WHEEL NUTS WERE LOOSE, BUT THAT THEY WOULDN'T STAY TIGHT. POSSIBLE CAUSE(S): DEFECTIVE STUDS WITH IMPROPER STEEL HARDENING OR MATERIAL. HYDROGEN EMBRITTLEMENT OF THE HARDENED ELECTROPLATED STUDS. OVERTIGHTENED STUDS WHICH STRETCHED BEYOND ELASTIC LIMIT. REASON OR TIME OF POSSIBLE OVER-TIGHTENING UNKNOWN; DEALERS RECORDS DO NOT SHOW WHEELS HAVE BEEN OFF THE VEHICLE. DRIVING THE VEHICLE WITH LOOSE NUTS FROM TIME OF ASSEMBLY (NOT LIKELY IN MODERN ASSEMBLY LINE METHODS) OR LOOSENED NUTS (CAUSE UNKNOWN) WHICH SEQUENTIALLY STRETCHED EACH UNTIL FATIGUED. NO EVIDENCE THIS COULD HAVE OCCURRED WITHOUT DEFORMING HOLES IN WHEEL. REMEDY: DEALER REMOVED AND INSPECTED WHEEL AND AXLE FLANGE AND REPLACED ALL WHEEL STUDS AND NUTS. RESULT: NEW STUDS ARE PERFORMING SATISFACTORY AND HOLDING PROPER TORQUE. NOT KNOWN IF OLD PARTS WERE KEPT. *TR
ON CERTAIN PASSENGER VEHICLES, THE REAR AXLE PINION SEAL DOES NOT MEET ALL OF THE SPECIFICATIONS AND MAY EXPERIENCE A FLUID LEAK.
Consequence & remedy
Consequence: A REAR DIFFERENTIAL FAILURE MAY CAUSE LOSS OF MOTIVE POWER AND POSSIBLY LOSS OF CONTROL INCREASING THE RISK OF A CRASH.
Remedy: DEALERS WILL REPLACE THE PINION SEAL FREE OF CHARGE. THE RECALL BEGAN ON FEBRUARY 1, 2008. OWNERS MAY CONTACT CADILLAC AT 1-800-458-8006 OR HTTP://WWW.CADILLAC.COM; PONTIAC AT 1-800-620-7668 OR HTTP://WWW.PONTIAC.COM; AND SATURN AT 1-800-972-8876 OR HTTP://WWW.SATURN.COM.
Model-level recall history does not show whether a particular VIN is affected or has received a repair. Check a VIN with NHTSA ↗
NHTSA investigations
1
PE07037 · Failure Of The Rear Differential
Opened Jul 17, 2007 · Closed Dec 27, 2007
Status: closed (inferred from source dates) · Power Train:driveline:differential Unit
ODI EVALUATED TWO DIFFERENT ALLEGED DEFECTS INVOLVING REAR DRIVETRAIN COMPONENTS DURING THIS PRELIMINARY EVALUATION.GM IS CONDUCTING A RECALL TO ADDRESS ONE OF THE DEFECT CONDITIONS AND ODI HAS OPENED AN ENGINEERING ANALYSIS TO CONTINUE ITS INVESTIGATION OF THE OTHER ALLEGED DEFECT. ON DECEMBER 19, 2007, GM SUBMITTED A DEFECT INFORMATION REPORT TO NHTSA CONCERNING DEFECTIVE REAR AXLE PINION SEALS IN APPROXIMATELY 275,936 MODEL YEAR (MY) 2005-07 CADILLAC CTS, STS AND SRX VEHICLES AS WELL AS MY 2006-07 PONTIAC SOLSTICE AND MY 2007 SATURN SKY VEHICLES (RECALL 07V-589).ON STS AND SRX VEHICLES WITH ALL WHEEL DRIVE, THE FRONT AXLE PINION SEAL ALSO DOES NOT MEET ALL OF GM'S SPECIFICATIONS AND MAY EXPERIENCE A FLUID LEAK.GM INDICATED THAT THE SEAL SUPPLIER MADE AN UNAUTHORIZED CHANGE TO THE PINION SEAL MATERIAL.LEAKING PINION SEALS COULD RESULT IN LOSS OF REAR DIFFERENTIAL LUBRICATION WHICH COULD RESULT IN REAR WHEEL LOCK-UP AND LOSS OF VEHICLE CONTROL. ON DECEMBER 7, 2007, ODI OPENED AN ENGINEERING ANALYSIS (EA07-017) TO INVESTIGATE COMPLAINTS OF REAR DRIVETRAIN COMPONENT FAILURE (E.G., FRACTURED REAR DIFFERENTIAL CARRIER HOUSING OR REAR AXLE HALF SHAFTS) WHILE DRIVING IN APPROXIMATELY 7,600 MY 2004 THROUGH 2006 CADILLAC CTS-V VEHICLES.THIS CONDITION MAY RESULT IN A LOSS OF MOTIVE POWER AND VEHICLE DISABLEMENT AND IS NOT ADDRESSED BY RECALL 07V-589.ODI IDENTIFIED 35 COMPLAINTS (16 TO ODI AND 19 TO GM) AND 128 WARRANTY CLAIMS POTENTIALLY RELATED TO THIS CONDITION (SEE EA07-017 OPENING RESUME).THESE COMPLAINTS ARE NOT INCLUDED IN THE FAILURE REPORT SUMMARY OF THIS CLOSING RESUME. THE COMPLAINTS AND WARRANTY FIGURES GIVEN IN THIS RESUME ARE LIMITED TO THOSE THAT (A) ARE MOST LIKELY CAUSED BY A LEAKING REAR PINION SEAL; AND (B) RESULTED IN AN ALLEGATION OF A REAR DIFFERENTIAL FAILURE WHILE DRIVING.THE DATA DO NOT INCLUDE ALL REPORTS OF SEAL LEAKAGE.
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