The 2005 Cobalt SS with the supercharged Ecotec is a fun platform when maintained, but the LSJ engine is notorious for piston/ring land failure under boost, and the F35 5-speed transmission has weak mounts and marginal cooling. Budget for eventual bottom-end work if you're buying high-mileage.
Piston Ring Land Failure (LSJ Engine)
Common · high severity
Typical onset: 60,000-120,000 mi
Symptoms: excessive oil consumption (quart every 500-1000 miles), blue smoke on startup or hard acceleration, loss of compression, misfires under boost, metallic rattling from crankcase
Fix: The hypereutectic pistons crack ring lands under boost, especially if detonation occurs or oil changes are neglected. Requires full short-block replacement or engine rebuild with forged pistons. 12-16 labor hours for R&R and rebuild, plus machine work. Many owners go aftermarket forged piston kit during rebuild.
Estimated cost: $3,500-6,000
Transmission Mount Collapse (Getrag F35)
Common · medium severity
Typical onset: 50,000-90,000 mi
Symptoms: harsh clunking on 1-2 shift or throttle lift, excessive engine movement visible from driver seat, difficulty getting into first or reverse, vibration at idle in gear
Fix: The side transmission mount is hydraulic-filled and tears internally, allowing drivetrain to slam around. Replace with OEM or upgraded polyurethane mount. 1.5-2 hours labor, straightforward job but requires supporting trans.
Estimated cost: $180-350
Transmission Oil Cooler Line Leaks
Occasional · medium severity
Typical onset: 70,000-110,000 mi
Symptoms: transmission fluid spots under car (red fluid), burnt transmission smell, hard or delayed shifts when hot, low fluid level on dipstick
Fix: Steel cooler lines rust through at the bends near subframe or at crimp connections to rubber hoses. The F35 runs hot to begin with, and low fluid accelerates clutch wear. Replace lines, flush system, refill with Dexron VI. 2-3 hours labor depending on rust.
Estimated cost: $300-550
Supercharger Coupler Wear (M62 Eaton)
Occasional · medium severity
Typical onset: 80,000-130,000 mi
Symptoms: whining or squealing from supercharger that varies with RPM, loss of boost pressure, Check Engine light with MAF/MAP correlation codes, rubber dust around snout
Fix: The rubber coupler between supercharger and snout wears and can shred, leading to total boost loss. Requires removing supercharger, replacing coupler and front bearing if damaged. 3-4 hours labor. Some techs also replace snout bearings preventively at this point.
Estimated cost: $450-800
Head Gasket Failure (Overheating or Detonation)
Occasional · high severity
Typical onset: 90,000-140,000 mi
Symptoms: coolant loss with no external leak, white smoke from exhaust, oil milky on dipstick, overheating after hard pulls, bubbling in coolant reservoir
Fix: Usually caused by detonation from bad gas, failing knock sensor, or overboost on modified cars. Head gasket blows between cylinders or into coolant jacket. Head must come off, check for warp, resurface if needed. MLS gasket and ARP studs recommended. 8-10 hours labor, more if head needs extensive machine work.
Estimated cost: $1,800-2,800
Fuel Filter Clogging (In-Tank Sock)
Occasional · medium severity
Symptoms: lean misfires under WOT, hesitation or stumble during hard acceleration, fuel pressure drops under load, Check Engine light with fuel trim codes
Fix: The sock-style pre-pump filter clogs over time, especially if tank has sediment or vehicle sits. Requires dropping fuel tank to access pump module. Many techs replace entire pump assembly. 2-3 hours labor.
Estimated cost: $350-600
Owner tips
Change oil every 3,000-4,000 miles with quality synthetic (5W-30) — the supercharger heats oil significantly and piston ring land failure is oil-change sensitive.
Use 91+ octane fuel always; the LSJ timing map is aggressive and detonation kills pistons fast.
Inspect transmission mounts every 30,000 miles — catching them early prevents hard part damage inside the trans.
If modifying for more boost, budget for forged pistons and rods immediately; stock bottom end is living on borrowed time above 300 whp.
Buy it if under 80k miles with full service records and you can wrench yourself — plan on $4k-6k in engine work eventually if you keep it past 100k or drive it hard.
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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UCI-FRAM Group is recalling certain LS1328 ignition Switches sold as Wells LS1328, Duralast LS1328, Airtex 1S6097, and Carquest 53-27479, and LS1497 Ignition Switches sold as Wells LS1497, Duralast LS1497, Airtex 1S10961, and Carquest 53-27967, for use on various General Motors model and model year vehicles during repair and replacement of the original ignition switch. The weight on the key ring and/or road conditions or some other jarring event may cause the affected ignition switches to move out of the run position, turning off the engine and disabling the air bags.
Consequence: If the ignition switch moves from the run position to accessory, the car would stall and the air bags will not deploy in the event of a crash, increasing the risk of personal injury to the occupants.
Remedy: UCI-FRAM Group has notified its purchasers to quarantine and return all inventory. Any switches already installed in vehicles will be replaced by GM dealers as part of NHTSA recall 14V-047, free of charge. UCI-Fram's purchasers should contact UCI-FRAM Group at 1-800-890-2075. GM vehicle owners requiring additional information on that recall campaign should contact GM at 1-800-222-1020 (Chevrolet), 1-800-762-2737 (Pontiac) or 1-800-553-6000 (Saturn).
ELECTRICAL SYSTEM:IGNITION · 14V171000
2014-04-10
General Motors LLC (GM) is recalling certain model year 2005-2010 Chevrolet Cobalt, 2006-2011 Chevrolet HHR, 2007-2010 Pontiac G5, 2006-2010 Pontiac Solstice, 2003-2007 Saturn Ion, and 2007-2010 Saturn Sky vehicles. In the affected vehicles, the key can be removed from the ignition when the ignition is not in the "Off" position.
Consequence: If the key can be removed from the ignition when the ignition is not in the "off" position, the vehicle could roll away: (a) for an automatic transmission, if the transmission is not in the "Park" position; or (b) for a manual transmission, if the parking brake is not engaged and the transmission is not in the "Reverse" position. This potential for rollaway increases the risk for a crash and occupant or pedestrian injuries.
Remedy: General Motors will notify owners, and for vehicles that were built with the defective ignition cylinder and have not
previously had the ignition cylinder replaced with the redesigned part, dealers will replace the ignition cylinder and cut and, if necessary, re-learn two ignition/door keys for each vehicle. For vehicles that were built with the redesigned ignition cylinder or had the ignition cylinder replaced with the redesigned part, dealers will cut and, if necessary, re-learn two ignition/door keys for each vehicle. The recall began on April 18, 2014. Chevrolet owners may contact General Motors at 1-800-222-1020, Pontiac owners at 1-800-762-2737, and Saturn owners at 1-800-553-6000. General Motors' number for this recall is 14113 for the ignition lock cylinder and key replacement, and 14133 for only key replacements. Note: Until a vehicle has been remedied, owners and operators are advised that when exiting, to be sure that the vehicle is in "Park," or in the case of a manual transmission, that the vehicle is in the "Reverse" position and the parking brake is engaged.
AIR BAGS · 14V047000
2014-02-10
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 February 10, 2014 that they are recalling 619,122 model year 2005-2007 Chevrolet Cobalt, and 2007 Pontiac G5 vehicles. On February 25, 2014, GM increased the recall to include an additional 748,024 model year 2006-2007 Chevrolet HHR and Pontiac Solstice vehicles and 2003-2007 Saturn Ion vehicles and 2007 Saturn Sky vehicles. 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.
On March 27, 2014, GM notified the agency that the defective ignition switches may have been used as service replacement parts on other vehicles, and as a result GM will be recalling certain model year 2008-2010 Chevrolet Cobalt, Saturn Sky, and Pontiac G5 and Solstice, and 2008-2011 Chevrolet HHR vehicles. The part numbers for the service parts are 10392423 (a/k/a ACDelco D1461F), 10392737, 15857948, 15854953, 15896640, and 25846762. This expansion represents an additional 823,788 vehicles.
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 replace the ignition switch, free of charge. An interim notification was issued to owners of 2007 and earlier models on March 10, 2014, informing them of the safety defect. Owners of 2008 and later vehicles will be mailed an interim letter on April 21, 2014. All affected owners will receive another letter once parts are available. The recall began on April 18, 2014. Owners may contact Chevrolet at 1-800-222-1020, Pontiac at 1-800-762-2737 or Saturn at 1-800-553-6000. GM's number for the initial recall is 13454 and 14063 for the expansion. GMs recall number for the vehicles that may have received the replacement parts is 14092. Note: Until the recall repairs have been performed, it is very important that customers remove all items from their key rings, leaving only the vehicle key. The key fob (if applicable), should also be removed from the key ring. Always wear your seatbelt.
STEERING:ELECTRIC POWER ASSIST SYSTEM · 10V073000
2010-03-03 · PE10005
GENERAL MOTORS IS RECALLING CERTAIN MODEL YEAR 2005-2010 CHEVROLET COBALT AND MODEL YEAR 2007-2010 PONTIAC G5 VEHICLES EQUIPPED WITH ELECTRIC POWER STEERING. THE DRIVER MAY EXPERIENCE A SUDDEN LOSS OF POWER STEERING ASSIST THAT COULD OCCUR AT ANY TIME WHILE DRIVING.
Consequence: IF POWER STEERING ASSIST IS LOST, IT WOULD REQUIRE GREATER DRIVER EFFORT AT LOW VEHICLE SPEEDS, INCREASING THE RISK OF A CRASH.
Remedy: DEALERS WILL REPLACE THE ELECTRIC POWER STEERING MOTOR FREE OF CHARGE. OWNERS ARE BEING NOTIFIED ON A ROLLING BASIS BETWEEN MARCH 29 THROUGH NOVEMBER 2010. A COPY OF THE MAILING SCHEDULE IS LOCATED IN THE RECALL FILE. OWNERS MAY CONTACT CHEVROLET AT 1-800-630-2438 AND PONTIAC AT 1-800-620-7668 OR AT THE OWNER CENTER AT WWW.GMOWNERCENTER.COM.
STRUCTURE · 07V014000
2007-01-18
CERTAIN PASSENGER VEHICLES NOT EQUIPPED WITH OPTIONAL ROOF-MOUNTED SIDE IMPACT AIR BAGS FAIL TO COMPLY WITH THE REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 201, 'OCCUPANT PROTECTION IN INTERIOR IMPACT.'
Consequence: IN A CRASH, HEAD IMPACT PROTECTION MAY BE INADEQUATE.
Remedy: DEALERS WILL INSTALL ENERGY ABSORBING PLASTIC TO THE HEADLINER TRIM TO REDUCE THE SEVERITY OF HEAD IMPACTS IN A CRASH. THE RECALL BEGAN ON MARCH 21, 2007. OWNERS MAY CONTACT CHEVROLET AT 1-800-630-2438.
EXTERIOR LIGHTING:HEADLIGHTS · 04V560000
2004-11-22
CERTAIN PASSENGER VEHICLES FAIL TO COMPLY WITH THE REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 108, "LAMPS, REFLECTIVE DEVICES, AND ASSOCIATED EQUIPMENT." THE BULB SHIELDS INSIDE OF THE HEADLAMPS CAN LOOSEN DUE TO VIBRATION.
Consequence: THE BULB SHIELD CAN LOOSEN OR BREAK BECAUSE OF VIBRATION. IF THIS OCCURRED ON A HEADLAMP INSTALLED IN A VEHICLE, ONCOMING DRIVERS MAY NOTICE ADDITIONAL GLARE, INCREASING THE RISK OF A CRASH.
Remedy: DEALERS WILL INSTALL TWO NEW HEADLAMP ASSEMBLIES. THE RECALL BEGAN ON NOVEMBER 17, 2004. OWNERS SHOULD CONTACT CHEVROLET AT 1-800-630-2438.
Performance
Horsepower
205hp
Torque
200lb-ft
0–60 mph
6.4sec
Quarter mile
14.9sec
Top speed
140mph
Capability & size
Curb weight
2,860lb
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 2005 Chevrolet Cobalt SS 2.0L I4 Supercharged and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years.