The 2008 Impala with the 3.5L V6 is a solid workhorse platform, but suffers from transmission cooler failures that can kill the transmission, intake manifold gasket leaks, and known ignition module problems that strand drivers. Later-mileage engines sometimes consume oil due to piston ring wear.
Transmission Oil Cooler Line Failure / Contamination
Common · high severity
Typical onset: 80,000-140,000 mi
Symptoms: Pink milky fluid in coolant reservoir or oil-like film on coolant, Transmission slipping or delayed engagement after cooler ruptures internally, Overheating transmission or coolant temp spikes, Complete transmission failure if coolant mixes with ATF
Fix: Replace transmission oil cooler lines and external cooler assembly (2-3 hours labor). If coolant has contaminated the trans, you're looking at full transmission flush or rebuild. Catching it early saves the transmission; missing it means $2,500+ rebuild.
Estimated cost: $400-800 for cooler lines alone; $2,500-4,000 if transmission is damaged
Intake Manifold Gasket Leaks
Common · medium severity
Typical onset: 90,000-150,000 mi
Symptoms: Coolant smell from engine bay, no visible external leak, Slow coolant loss without puddles under car, Rough idle or misfire codes if coolant seeps into cylinders, White smoke from exhaust on cold starts
Fix: Replace upper and lower intake manifold gaskets. This is a 5-6 hour job on the 3.5L due to disassembly required. Often done with spark plugs and ignition coils while you're in there.
Estimated cost: $800-1,400
Ignition Control Module Failure (Recall-Related)
Occasional · high severity
Symptoms: No-start condition with no crank, no warning, Intermittent stalling while driving, restarts after cooling, Security light flashing, passlock system fault codes, Car dies at highway speed and won't restart for 10-20 minutes
Fix: Replace ignition control module or ignition switch assembly (NHTSA recall covered some VINs—check if already done). 1-2 hours labor. This can leave you stranded in traffic, so address any intermittent starting issues immediately.
Estimated cost: $250-500 if not recall-covered
Excessive Oil Consumption / Piston Ring Wear
Occasional · medium severity
Typical onset: 120,000-180,000 mi
Symptoms: Burning one quart of oil every 800-1,500 miles, Blue smoke on acceleration or deceleration, Fouled spark plugs on cylinders 2, 4, or 6, Low oil pressure warning if driven low on oil
Fix: Piston ring replacement requires engine teardown—8-12 hours labor minimum. Some techs do a short block swap instead if bearings show wear. This is often a 'drive it till it dies' situation unless the rest of the car is pristine.
Estimated cost: $2,800-4,500 for engine rebuild or short block
Lower Control Arm Bushing Wear
Common · low severity
Typical onset: 70,000-110,000 mi
Symptoms: Clunking over bumps from front suspension, Wandering steering or vague on-center feel, Inner tire edge wear from alignment shift, Steering wheel off-center after hitting potholes
Fix: Replace front lower control arms (bushings are not serviceable separately on most aftermarket arms). 2-3 hours labor plus alignment. A recall existed for some VINs due to ball joint separation risk—verify recall completion.
Estimated cost: $400-700 including alignment
Transmission Mount Collapse
Occasional · low severity
Typical onset: 90,000-140,000 mi
Symptoms: Clunk when shifting from Park to Drive or Reverse, Vibration at idle in gear, smooths out in Park/Neutral, Excessive engine movement visible when revving in Park
Fix: Replace front or rear transmission mount. 1-1.5 hours labor, straightforward job. Often the side torque strut mount fails first.
Estimated cost: $200-350
Owner tips
Check transmission cooler lines for seepage every oil change after 80k miles—catching a weep early prevents catastrophic trans failure
Inspect coolant reservoir for oil film or milky appearance monthly on high-mileage examples
If the recall for ignition control module wasn't done, do it—this is a safety issue at highway speeds
Budget for intake gaskets if buying over 100k miles; it's a when-not-if item on the 3.5L
Use high-mileage oil after 100k and check level every 500 miles if you see any consumption starting
Solid daily driver under 100k miles with service records showing the trans cooler lines were addressed; after 120k, expect intake gaskets and possible oil consumption—budget accordingly or walk away.
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 standard on GM vehicles
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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.
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 2008 Chevrolet Impala 3.5L V6 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.