The 2012 Impala on the W-platform is generally solid transportation, but the 3.6L V6 (LFX) has well-documented timing chain and piston ring wear issues that can turn catastrophic. The 3.5L is more reliable, but both share transmission cooler and intake manifold gasket weaknesses.
3.6L V6 Timing Chain Stretch and Piston Ring Failure
Common · high severity
Typical onset: 80,000-150,000 mi
Symptoms: Excessive oil consumption (1qt per 1,000 mi or worse), Cold-start rattle for 2-5 seconds, Check engine light with misfire codes P0300-P0306, Loss of power under load, Metal flakes in oil filter
Fix: Timing chains stretch and guides wear, causing noise and potential valve timing issues. Piston rings collapse leading to oil burning and carbon buildup. At this point, most engines need a rebuild or replacement long block. Timing chain job alone is 12-15 hours; full rebuild or reman engine install is 18-24 hours. Many owners opt for used low-mile engines (10-12 hours swap).
Estimated cost: $4,500-7,500
Transmission Oil Cooler Line Failure at Radiator
Common · high severity
Typical onset: 60,000-120,000 mi
Symptoms: Pink or milky transmission fluid, Transmission slipping or no engagement, Coolant in trans pan during service, Overheating transmission, Sudden transmission failure after coolant cross-contamination
Fix: The cooler lines corrode at the crimp junction where they enter the radiator, allowing coolant and ATF to mix. Once cross-contaminated, the 4T65-E transmission is toast. Requires new radiator, cooler lines, transmission flush if caught early, or full transmission replacement if coolant got in. Trans R&R is 8-10 hours, plus flush/refill adds 2 hours. If transmission is damaged, 10-12 hours for reman install.
Estimated cost: $600-1,200 (lines/radiator only) or $2,800-4,200 (with transmission replacement)
Intake Manifold Gasket Leak (3.5L and 3.6L)
Common · medium severity
Typical onset: 70,000-130,000 mi
Symptoms: Coolant smell from engine bay, especially after shutdown, Slow coolant loss without visible external leaks, Rough idle or misfire when cold, White smoke briefly on cold start, Coolant residue on lower intake runners or in spark plug wells
Fix: The lower intake manifold gaskets deteriorate and leak coolant into the valley or intake ports. On the 3.5L it's more straightforward; on the 3.6L you're removing the upper plenum and fuel rails. Count on 5-7 hours for 3.5L, 6-8 hours for 3.6L. Always inspect coolant elbows and thermostat housing while in there.
Estimated cost: $800-1,400
Power Steering Pressure Hose Leaks
Occasional · medium severity
Typical onset: 90,000-140,000 mi
Symptoms: Power steering fluid puddles under engine, Whining or groaning when turning at low speeds, Heavy steering effort when fluid runs low, Burning smell from fluid hitting exhaust
Fix: The high-pressure hose from pump to rack develops leaks at crimped fittings or rubber sections crack from heat. This was part of a recall for some VINs (14V-396), but many outside the range still fail. Hose replacement is 1.5-2 hours, but accessibility is tight and requires raising the engine slightly or working around the frame.
Estimated cost: $300-550
Front Lower Control Arm Bushings and Ball Joints
Occasional · medium severity
Typical onset: 80,000-120,000 mi
Symptoms: Clunking over bumps from front suspension, Steering wander or loose on-center feel, Uneven inner tire wear, Vibration during braking, Play in front wheel when jacked up
Fix: The lower control arm ball joints and bushings wear, especially in rust-belt states. Some arms have riveted ball joints that require full arm replacement; others are bolt-in. Plan on replacing both lower arms as a pair with alignment. 2.5-3.5 hours per side including alignment.
Estimated cost: $600-1,000 (both sides with alignment)
Ignition Lock Cylinder Failure
Occasional · medium severity
Symptoms: Key won't turn or gets stuck in ignition, Ignition cylinder turns but won't start car, Key stuck in ACC or ON position, Difficulty removing key after shutdown
Fix: The ignition lock cylinder wears internally, and the wafers bind or break. GM issued a recall (14V-153) for some VINs addressing this, but many still fail outside recall scope. Replacement involves removing steering column covers and disabling airbag; proper procedure requires a new cylinder coded to your key. 1.5-2 hours labor.
Estimated cost: $250-450
Owner tips
If buying a 3.6L, have a pre-purchase oil consumption test done (check level cold, drive 500 mi, recheck). Walk away if it uses more than 1qt per 1,000 mi.
Inspect transmission fluid color religiously every oil change. Pink or milky = stop driving immediately.
Use Dexos1-spec oil (5W-30) in the 3.6L and change every 5,000 mi max to slow timing chain wear. Consider 0W-40 synthetic if oil consumption has started.
Budget for intake manifold gaskets as a when-not-if item on any high-mile example.
Buy a 3.5L model under 100k miles with documented trans cooler line replacement; avoid the 3.6L unless you're prepared for an engine rebuild or swap.
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; battery located in engine compartment
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Every control module on the 2008-2013 Chevrolet Impala — 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.
Electric Power Steering Control Module (EPSCM)2.8 hr R&Rdealer / factory tool +0.4 hr▸ programming details
📍 Integrated with steering column assembly, below instrument panel
🔧 Tech 2 or GDS2/MDI with GM SPS2
⚠️ Steering column must be removed for access. VIN programming and steering angle sensor calibration required.
⚠️ Sensor ID relearn required after replacement or tire rotation. BCM stores sensor IDs.
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.
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.
STEERING:HYDRAULIC POWER ASSIST:HOSE, PIPING, AND CONNECTIONS · 11V398000
2011-08-05
GM IS RECALLING CERTAIN MODEL YEAR 2012 CHEVROLET IMPALA VEHICLES MANUFACTURED FROM APRIL 19, 2011, THROUGH JULY 29, 2011. THE UPPER POWER STEERING HOSE MAY HAVE BEEN MISROUTED SO THAT IT CAN COME IN CLOSE PROXIMITY TO AND/OR CONTACT THE CATALYTIC CONVERTER. WITH THE ENGINE ON, HEAT FROM THE CATALYTIC CONVERTER MAY MELT THE POWER STEERING HOSE.
Consequence: POWER STEERING FLUID COULD FLOW ONTO THE CATALYTIC CONVERTER, AND AN ENGINE COMPARTMENT FIRE COULD OCCUR.
Remedy: GM DEALERS WILL INSPECT TO ENSURE THAT THE UPPER POWER STEERING HOSE IS ROUTED CORRECTLY AND MAKE THE NECESSARY REPAIRS FREE OF CHARGE. THE SAFETY RECALL BEGAN ON SEPTEMBER 5, 2011. OWNERS MAY CONTACT CHEVROLET AT 1-800-630-2438.
Fuel economy (EPA)
City
18mpg
Highway
29mpg
Combined
22mpg
Fuel
Regular Gasoline
Capability & size
EPA class
Large Cars
Wiper blades
9th generation (2006-2013). Sedan body style, no rear wiper.
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 2012 Chevrolet Impala 3.6L V6 and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Mechanic · 20+ years.