The 2009 Impala SS uses the LS4 5.3L V8 (NOT the truck LS platform) in a front-wheel-drive configuration, creating unique failures tied to high torque through a 4T65E-HD transmission and Active Fuel Management (AFM) cylinder deactivation that's notorious for internal engine damage.
AFM Lifter Collapse and Camshaft Wear Leading to Engine Failure
Common · high severity
Typical onset: 80,000-150,000 mi
Symptoms: Ticking/tapping noise from engine bay, especially on cold starts, Check engine light with P0300-series misfire codes or P0521 oil pressure, Loss of power, rough idle, eventually complete failure, Metal shavnel in oil during changes
Fix: AFM (Active Fuel Management) lifters fail, wiping out camshaft lobes and sending debris through the engine. Requires either AFM delete kit with cam swap (12-16 hours labor) or full engine rebuild/replacement (20-30 hours). Most shops recommend full rebuild once cam damage occurs since debris contaminates bearings.
Estimated cost: $4,500-8,000
4T65E-HD Transmission Failures (Oil Cooler and Internal Hard Parts)
Common · high severity
Typical onset: 100,000-140,000 mi
Symptoms: Harsh 2-3 shift or slipping under acceleration, Transmission temperature warning light, Coolant in transmission fluid or vice versa (strawberry milkshake fluid), Delayed engagement when shifting into drive or reverse
Fix: The internal oil cooler in the radiator fails, cross-contaminating coolant and ATF, destroying clutch packs and pump. Requires transmission rebuild (10-14 hours), radiator replacement, and complete cooling system flush. Even without cooler failure, the 4T65E-HD struggles with SS torque—expect 3-4 clutch pack wear or input shaft issues around 120k.
Estimated cost: $3,200-5,500
Piston Ring Land Failure and Cylinder Scoring
Occasional · high severity
Typical onset: 90,000-130,000 mi
Symptoms: Excessive oil consumption (1 quart per 500-1,000 miles), Blue smoke on startup or acceleration, Fouled spark plugs, especially on cylinders 1, 4, 6, or 7, Loss of compression on cylinder leakdown test
Fix: Carbon buildup from AFM combined with heat causes piston ring lands to crack or rings to seize. Requires engine disassembly—either short block replacement (18-24 hours) or full rebuild with pistons, rings, honing (25-35 hours). Not repairable with top-end work alone if cylinder walls are scored.
Estimated cost: $5,000-9,500
Engine and Transmission Mount Failures
Common · medium severity
Typical onset: 70,000-110,000 mi
Symptoms: Violent clunk when shifting from park to drive or reverse, Vibration through steering wheel and floor at idle, Engine rocks visibly under acceleration, Torque steer pulling hard to one side under power
Fix: The 303 lb-ft of torque destroys mounts faster than standard Impalas. Rear transmission mount is the most common (2.5 hours), but upper torque strut and front engine mount often need replacement simultaneously. Use OEM or performance mounts—aftermarket economy versions fail in 20k miles.
Estimated cost: $600-1,200
Fuel Pump and Fuel Filter Sock Clogging
Occasional · medium severity
Typical onset: 90,000-140,000 mi
Symptoms: Hard starting after sitting, especially in warm weather, Loss of power above 4,000 RPM or under wide-open throttle, Stumble or hesitation during acceleration, Fuel pressure drops below 55 PSI under load
Fix: The in-tank fuel filter sock clogs (GM doesn't use external filters on this platform post-2006 in some configurations), starving fuel pressure. Requires fuel tank drop and pump module replacement (3-4 hours). The pump itself also wears out from running lean when the sock restricts flow.
Estimated cost: $700-1,100
Intake Manifold Gasket Leaks (Upper Plenum)
Occasional · low severity
Typical onset: 80,000-120,000 mi
Symptoms: Rough idle, especially when cold, P0171/P0174 lean codes (both banks), Whistling or hissing noise from engine bay, Occasional stalling at stop lights
Fix: Plastic upper intake manifold warps slightly, causing vacuum leaks at the gasket. Replacement involves removing the plenum and installing updated gaskets (4-5 hours). Not catastrophic but causes drivability issues and lean conditions that stress catalytic converters.
Estimated cost: $600-900
Owner tips
Disable AFM immediately with a Range Technology or HP Tuners AFM delete—it's $500 in prevention versus $6,000 in engine work
Change transmission fluid every 30,000 miles with full synthetic Dexron VI and consider external trans cooler to bypass the factory radiator cooler failure point
Use quality full synthetic oil (5W-30) and change every 5,000 miles maximum—AFM engines are brutal on oil
Inspect motor mounts annually; budget for replacement every 60-80k miles as preventive maintenance
Check oil consumption monthly; if burning more than 1 quart per 3,000 miles, investigate immediately before catastrophic failure
Only buy if AFM has already been deleted and transmission has been rebuilt or confirmed healthy—otherwise you're buying someone else's $10k problem waiting to happen.
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.
Fitment notes: Side post terminals; higher CCA recommended for 5.3L V8 engine
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Every control module on the 2006-2009 Chevrolet Impala SS — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
⚠️ Passlock II system. BCM replacement requires full theft relearn with 30-minute procedure.
Tire Pressure Monitor Control Module (TPMS)relearn only +0.2 hr▸ programming details
📍 Integrated within BCM
🔧 Tech 2 or TPMS relearn tool
⚠️ 2007+ models; sensor ID relearn required after tire rotation or sensor replacement
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
AIR BAGS:SENSOR:OCCUPANT CLASSIFICATION · 16V507000
2016-07-05
General Motors LLC (GM) is recalling certain model year 2009-2010 Chevrolet Impala vehicles manufactured April 25, 2008 through February 16, 2010. The front passenger seat frame may contact and damage the wires of the passenger presence sensor module.
Consequence: If the wires are damaged, the passenger presence sensory system may fail to recognize that the passenger seat is occupied, disabling the air bag. Damage may also cause the air bag fuse to short resulting in a loss of all air bags and seat belt pretensions. Both conditions increase the risk of injury during a crash.
Remedy: GM will notify owners, and dealers will double wrap the wires with anti-abrasion tape and replace damaged wires as necessary, free of charge. The recall began on August 1, 2016. Owners may contact Chevrolet customer service at 1-800-521-7300. GM's recall campaign number is 36110.
ELECTRICAL SYSTEM:IGNITION · 14V355000
2014-06-23
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) is recalling certain model year 2005-2009 Buick LaCrosse, 2006-2011 Buick Lucerne, 2000-2005 Cadillac DeVille, 2006-2011 Cadillac DTS, 2006-2014 Chevrolet Impala, and 2006-2007 Chevrolet Monte Carlo vehicles. In the affected vehicles, the weight on the key ring and 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. Additionally, a key knocked out of the run position will cause loss of engine power, power steering, and power braking, increasing the risk of a vehicle crash.
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 23, 2014. Owners may contact General Motors customer service at 1-800-521-7300 (Buick), 1-800-458-8006 (Cadillac), and 1-800-222-1020 (Chevrolet). GM's number for this recall is 14299.
SUSPENSION:FRONT:CONTROL ARM:LOWER ARM · 12V377000
2012-08-03
General Motors (GM) is recalling certain model year 2008-2012 Chevrolet Impala police vehicles because the front lower control arms may fracture. This safety recall does not include non-police Chevrolet Impala vehicles.
Consequence: A broken control arm can result in the loss of control of the vehicle, increasing the risk of a crash.
Remedy: GM will notify owners, and dealers will replace both front lower control arms, free of charge. The safety recall began on August 21, 2012. Owners may contact the Chevrolet owner center at 1-866-694-6546.
SEAT BELTS:FRONT:ANCHORAGE · 10V480000
2010-10-13
GM IS RECALLING CERTAIN MODEL YEAR 2009-2010 CHEVROLET IMPALAS FOR FAILING TO COMPLY WITH THE REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 210, "SEAT BELT ASSEMBLY ANCHORAGES." THE FRONT SAFETY BELT WEBBING MAY NOT HAVE BEEN PROPERLY SECURED TO THE LAP BELT ANCHOR PRETENSIONER MOUNTED TO THE SIDE OF THE SEAT NEAREST THE DOOR.
Consequence: THE SAFETY BELT MAY NOT RESTRAIN THE OCCUPANT AS INTENDED DURING A CRASH, WHICH COULD RESULT IN INJURY TO THE OCCUPANT.
Remedy: DEALERS WILL INSPECT BOTH FRONT SAFETY BELTS FOR PROPER INSTALLATION OF THE ANCHORS TO THE PRETENSIONERS AND, IF NECESSARY, REINSTALL THE ANCHORS. THIS SERVICE WILL BE PERFORMED FREE OF CHARGE. THE SAFETY RECALL BEGAN ON NOVEMBER 5, 2010. OWNERS MAY CONTACT CHEVROLET AT 1-800-630-2438 OR AT THE OWNER CENTER AT WWW.GMOWNERCENTER.COM.
AIR BAGS:FRONTAL · 08V517000
2008-10-06
GM IS RECALLING 79 MY 2009 CHEVROLET IMPALA VEHICLES. SOME OF THESE VEHICLES HAVE A PASSENGER-SIDE FRONT AIR BAG INFLATOR THAT COULD FRACTURE AT AN INFLATOR TUBE DURING A DEPLOYMENT.
Consequence: DURING A PASSENGER-SIDE AIR BAG DEPLOYMENT, PIECES OF THE INFLATOR TUBE COULD STRIKE AND INJURE VEHICLE OCCUPANTS AND THE AIR BAG CUSHION WOULD NOT INFLATE FULLY, REDUCING THE CAPABILITY OF THE BAG TO PROTECT THE PASSENGER.
Remedy: DEALERS WILL INSTALL A NEW PASSENGER-SIDE FRONT AIR BAG. THE RECALL BEGAN ON OCTOBER 10, 2008. OWNERS MAY CONTACT CHEVROLET AT 1-800-630-2438 OR THROUGH THEIR WEBSITE AT <A HREF=HTTP://WWW.GMOWNERCENTER.COM>HTTP://WWW.GMOWNERCENTER.COM</A> .
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 2009 Chevrolet Impala SS 5.3L V8 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.