The 2007 CTS-V is powered by the LS6 6.0L V8 (not 5.7L) mated to a Tremec T56 six-speed manual or 6L80 six-speed auto. It's a serious performance sedan, but the LS6 bottom-end and differential are its Achilles heels under hard use, and the manual transmission can be fragile when abused.
Symptoms: metallic knock or rattle from low in the engine, especially cold start, oil pressure drops suddenly, metal shavings in oil, catastrophic failure if ignored
Fix: LS6 engines are known for weak piston ringland and bearing issues, especially with aggressive driving or missed oil changes. Repair requires engine-out teardown, inspecting/replacing pistons, rings, rod bearings, and often mains. Many opt for a forged piston short-block swap or full rebuild. 18-24 labor hours for removal, teardown, rebuild, and reinstall.
Estimated cost: $4,500-8,000
Rear Differential Clutch Pack Wear and Fluid Breakdown
Common · medium severity
Typical onset: 50,000-80,000 mi
Symptoms: clunking or shuddering on tight turns, whining or growling from rear end under load, vibration during acceleration, burnt gear oil smell
Fix: The factory limited-slip uses clutch packs that wear and create chatter, especially if fluid changes were skipped. Requires diff removal, teardown, clutch pack replacement, and fresh friction-modifier fluid. Some owners upgrade to an Eaton or Wavetrac LSD during repair. 4-6 labor hours.
Estimated cost: $1,200-2,200
Tremec T56 Manual Transmission Synchro Wear (2nd and 3rd Gear)
Occasional · medium severity
Typical onset: 70,000-120,000 mi
Symptoms: grinding or difficulty engaging 2nd or 3rd gear, crunching on downshifts, requires forcing shifter or double-clutching, clutch feels normal but shifts are rough
Fix: The T56 is strong but synchros wear with aggressive shifting or clutch dump launches. Rebuild requires transmission removal, case split, synchro hub/sleeve/ring replacement, and bearing inspection. 10-14 labor hours. Some shops just replace the transmission with a used or upgraded unit.
Estimated cost: $2,800-4,500
Transmission Oil Cooler Line Leaks (Hydraulic and Rubber Hose Failure)
Common · medium severity
Typical onset: 80,000-130,000 mi
Symptoms: transmission fluid puddles under front of car, low fluid warnings, burnt transmission smell, overheating transmission, recall-related brake line contamination if fluid leaks onto brake lines
Fix: Rubber cooler lines age, crack, and leak. Metal lines can corrode at fittings. NHTSA recall addressed contamination risk to brake lines. Replace both cooler lines and inspect surrounding brake lines for fluid damage. 2-3 labor hours.
Estimated cost: $400-700
Transmission Mount Collapse
Common · low severity
Typical onset: 60,000-100,000 mi
Symptoms: clunking when shifting gears or launching, excessive drivetrain movement felt through shifter, vibration at idle in gear, visible sagging or torn rubber on mount
Fix: High torque tears the transmission crossmember mount. Replacement requires raising the transmission slightly and swapping the mount. Upgraded polyurethane mounts are available but increase NVH. 1.5-2 labor hours.
Estimated cost: $250-450
Fuel Filter Clogging and Pump Strain
Occasional · medium severity
Symptoms: hesitation or stumble under hard acceleration, rough idle or intermittent stalling, long cranking before start, fuel pressure drops under load
Fix: The LS6 is sensitive to fuel delivery issues. Clogged in-tank filter strainer or failing pump reduces pressure, causing lean conditions. Drop the tank, replace pump assembly or filter sock, test pressure. 3-4 labor hours.
Estimated cost: $600-1,100
Head Gasket Failure (Both Banks)
Rare · high severity
Typical onset: 100,000-150,000 mi
Symptoms: white smoke from exhaust, coolant loss with no visible leak, overheating or fluctuating temp gauge, milky oil or oil in coolant, misfires or rough running
Fix: LS6 head gaskets can fail from overheating, detonation, or age. Requires heads-off repair, resurfacing, and ARP studs recommended. Often done during bottom-end rebuild. 12-16 labor hours for gaskets alone.
Estimated cost: $2,500-4,000
Owner tips
Change rear diff fluid every 30k miles with GM friction modifier — prevents clutch pack chatter and extends life.
Use quality full-synthetic 5W-30 and change every 5k miles — LS6 bearings are sensitive to oil quality and the engine runs hot.
Inspect transmission cooler lines and fittings annually — early catch prevents catastrophic fluid loss and transmission damage.
If buying used, compression test and oil analysis are essential — bottom-end issues are expensive and common with unknown service history.
Upgraded transmission and diff mounts reduce wheel hop and protect drivetrain, but increase vibration — balance performance vs comfort.
Buy one if service history is documented and you budget $3-5k for eventual diff and trans work — it's a muscle sedan that rewards proper care but punishes neglect and abuse.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.
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SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:HOSES, LINES/PIPING, AND FITTINGS · 15V225000
2015-04-15
General Motors LLC (GM) is recalling certain model year 2004-2007 Cadillac CTS-V vehicles manufactured between September 6, 2003, and June 11, 2007, currently registered, or originally sold, in Connecticut, Delaware, Illinois, Indiana, Iowa, Maine, Maryland, Massachusetts, Michigan, Minnesota, Missouri, New Hampshire, New Jersey, New York, Ohio, Pennsylvania, Rhode Island, Vermont, West Virginia, Wisconsin and the District of Columbia. In the affected vehicles, snow or water containing road salt or other contaminants may corrode the front brake hose fitting at the caliper.
Consequence: Corrosion may cause the brake system to leak which could lengthen the distance needed to stop the vehicle and increase the risk of a crash.
Remedy: GM will notify owners, and dealers will replace both front brake hose assemblies, free of charge. The recall began on May 8, 2015. Owners may contact Cadillac customer service at 1-800-458-8006. GM's number for this recall is 15149. Note: This recall is an expansion of recall 10V-105.
General Motors LLC (GM) is recalling certain model year 2004-2007 Cadillac CTS-V vehicles manufactured October 6, 2003, to March 15, 2007, and 2006-2007 Cadillac STS-V vehicles manufactured June 23, 2005, to March 15, 2007. In the affected vehicles, the electrical terminals of the fuel pump module may overheat resulting in the melting of the flange material.
Consequence: If the flange melts, a hole may be created allowing the fuel pump to leak fuel, causing the vehicle to stall, increasing the risk of a vehicle crash. Additionally, leaking fuel in the presence of an ignition source increases the risk of a fire.
Remedy: GM will notify owners, and dealers will replace the fuel module and fuel tank jumper harness, free of charge. GM sent out interim notices in late October. The recall began on March 12, 2015. Owners may contact Cadillac customer service at 1-800-458-8006. GM's number for this recall is 14405.
ELECTRICAL SYSTEM:IGNITION · 14V394000
2014-07-02
This defect can affect the safe operation of the airbag system. Until this recall is performed, customers should remove all items from their key rings, leaving only the ignition key. The key fob (if applicable), should also be removed from the key ring.
General Motors LLC (GM) notified the agency on July 2, 2014 that they are recalling 554,328 model year 2003-2014 Cadillac CTS vehicles manufactured August 16, 2001, to April 28, 2014, and 2004-2006 Cadillac SRX vehicles manufactured March 20, 2003, to August 11, 2006. In these models, the weight on the key ring and/or road conditions or some other jarring event may cause the ignition switch to move out of the run position, turning off the engine.
Consequence: If the key is not in the run position, the air bags may not deploy if the vehicle is involved in a crash, increasing the risk of injury.
Remedy: GM will notify owners, and dealers will install two key rings and an insert in the key slot or a cover over the key head on all ignition keys, free of charge. The recall began on September 15, 2014. Owners may contact Cadillac customer service at 1-800-458-8006. GM's number for this recall is 14172.
AIR BAGS:FRONTAL:SENSOR/CONTROL MODULE-INACTIVE · 10V644000
2010-12-17
GENERAL MOTORS IS RECALLING CERTAIN MODEL YEAR 2005-2007 CADILLAC CTS VEHICLES. SOME OF THESE VEHICLES HAVE A CONDITION IN WHICH REPEATED FLEXING OF THE PASSENGER SENSING SYSTEM MAT IN THE FRONT PASSENGER SEAT MAY CAUSE THE MAT TO KINK, BEND, OR FOLD. THIS FLEXING CAN BREAK THE CONNECTIONS IN THE MAT. IF THIS OCCURS, THE SENSOR MAY NOT DETECT THE PRESENCE OF A FRONT SEAT PASSENGER AND WILL DISABLE THE AIR BAG.
Consequence: NON-DEPLOYMENT OF THE FRONT PASSENGER AIR BAG IN THE EVENT OF A CRASH NECESSITATING THAT AIR BAG'S DEPLOYMENT MAY REDUCE PROTECTION OF THE PASSENGER AND INCREASE THE RISK OR SEVERITY OF INJURY TO THEM.
Remedy: DEALERS WILL REPLACE THE PASSENGER SENSING SYSTEM FREE OF CHARGE. THE SAFETY RECALL IS EXPECTED TO BEGIN ON OR ABOUT MARCH 15, 2011. OWNERS MAY CONTACT CADILLAC AT 1-866-982-2339, CHEVROLET AT 1-800-630-2438, GMC AT 1-866-996-9463 AND AT THE OWNER CENTER AT WWW.GMOWNERCENTER.COM.
SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:HOSES, LINES/PIPING, AND FITTINGS · 10V105000
2010-03-17
GENERAL MOTORS HAS NOTIFIED NHTSA OF A DEFECT IN CERTAIN MODEL YEAR 2003-2007 CADILLAC CTS VEHICLES CURRENTLY REGISTERED IN OR ORIGINALLY SOLD IN CONNECTICUT, DELAWARE, ILLINOIS, INDIANA, IOWA, MAINE, MARYLAND, MASSACHUSETTS, MICHIGAN, MINNESOTA, MISSOURI, NEW HAMPSHIRE, NEW JERSEY, NEW YORK, OHIO, PENNSYLVANIA, RHODE ISLAND, VERMONT, WASHINGTON D.C., WEST VIRGINIA AND WISCONSIN. SOME OF THESE VEHICLES HAVE A CONDITION IN WHICH THE FRONT BRAKE HOSE FITTING AT THE CALIPER MAY CORRODE DUE TO SNOW OR WATER, CONTAINING ROAD SALT OR OTHER CONTAMINANTS, ENTERING AND BEING RETAINED IN THE ROUTING SLEEVE. IF THE FITTING CORRODES SIGNIFICANTLY, THE BRAKE HOSE-TUBE INTERFACE MAY DEVELOP A LEAK.
Consequence: THE BRAKE HOSE-TUBE INTERFACE MAY RUPTURE SUDDENLY WITHOUT PRIOR WARNING AND INCREASE VEHICLE STOPPING DISTANCE MAY OCCUR INCREASING THE RISK OF A CRASH.
Remedy: DEALERS ARE TO REPLACE BOTH FRONT BRAKE HOSE ASSEMBLIES FREE OF CHARGE. THE SAFETY RECALL IS EXPECTED TO BEGIN DURING MAY 2010. OWNERS MAY CONTACT CADILLAC AT 1-866-982-2339 OR AT THE OWNER CENTER AT WWW.GMOWNERCENTER.COM.
POWER TRAIN:AXLE ASSEMBLY:AXLE SHAFT:SEAL · 07V589000
2007-12-20 · PE07037
ON CERTAIN PASSENGER VEHICLES, THE REAR AXLE PINION SEAL DOES NOT MEET ALL OF THE SPECIFICATIONS AND MAY EXPERIENCE A FLUID LEAK.
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.
STRUCTURE:BODY:ROOF AND PILLARS · 07V468000
2007-10-04
CERTAIN VEHICLES FAIL TO COMPLY WITH THE REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 118, 'POWER OPERATED WINDOW, PARTITION, AND ROOF PANEL SYSTEMS.' UNDER THE STANDARD, THE SUNROOF MAY ONLY BE CLOSED WHEN THE IGNITION IS ON, OR AFTER THE IGNITION IS TURNED OFF, BUT BEFORE EITHER OF THE FRONT DOORS ARE OPENED. THE AFFECTED VEHICLES MAY EXHIBIT A CONDITION WHERE THE SUNROOF CAN BE CLOSED AFTER THE IGNITION IS TURNED OFF AND THE DOORS ARE OPENED.
Consequence: THIS STANDARD SPECIFIES REQUIREMENTS FOR POWER OPERATED WINDOW, PARTITION, AND ROOF PANEL SYSTEMS TO MINIMIZE THE LIKELIHOOD OF DEATH OR INJURY FROM THEIR ACCIDENTAL OPERATION.
Remedy: DEALERS WILL INSTALL A WIRE HARNESS. THE RECALL BEGAN ON MAY 29, 2008. OWNERS MAY CONTACT CADILLAC AT 1-866-982-2339.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years.