The 2018 Acura ILX with the 2.4L K24 engine is generally reliable, but suffers from a notorious oil-dilution problem in cold climates that can lead to catastrophic engine failure, plus some typical Honda/Acura transmission cooler and mount issues.
Oil Dilution / Fuel in Crankcase (Cold Climate)
Common · high severity
Typical onset: 30,000-80,000 mi
Symptoms: Oil level rising on dipstick between changes, Strong fuel smell from oil dipstick, Check engine light with misfire codes (P0300 series), Rod knock or bottom-end noise after prolonged dilution, Excessive oil consumption once rings are damaged
Fix: Short-trip driving in freezing temps allows unburned fuel to wash past rings into crankcase. If caught early (oil changes every 3k mi, monitor level), engine survives. Once bearing or ring damage occurs, requires complete engine rebuild or short block replacement. Rebuild: 18-24 hours labor. Honda issued TSB but no permanent fix.
Estimated cost: $5,500-9,000
Transmission Oil Cooler Line Leaks
Common · medium severity
Typical onset: 60,000-100,000 mi
Symptoms: ATF puddle under front of vehicle, Transmission running hot or slipping, Low fluid level on dipstick, Corroded or weeping crimp connections at cooler
Fix: Factory crimp fittings on cooler lines corrode and leak, especially in salt states. Replace both cooler lines and flush system. 2-3 hours labor. OEM lines recommended—aftermarket crimps fail again.
Estimated cost: $400-700
Transmission Mount Failure
Occasional · medium severity
Typical onset: 70,000-120,000 mi
Symptoms: Clunk on 1-2 shift or when engaging Drive/Reverse, Excessive engine movement visible from engine bay during acceleration, Vibration at idle in gear, Visibly torn or oil-soaked rubber on upper mount
Fix: Upper transmission mount (torque mount) deteriorates, allowing driveline slop. Common on all K24 Hondas/Acuras. Replace mount. 1.5-2 hours labor. OEM part is pricey but lasts; aftermarket mounts are firmer.
Estimated cost: $250-450
Fuel Pump Recall / Premature Failure
Occasional · high severity
Symptoms: No-start or stalling at any speed, Rough idle or hesitation under load, Check engine light with low fuel pressure codes (P0087), Whining noise from rear seat area fuel tank
Fix: NHTSA recall for defective Denso fuel pump impeller that swells and stalls. Dealer replaces pump assembly under recall. If out of recall window or secondary failure, expect 3-4 hours labor for pump R&R (tank drop or access panel method varies by build date).
Estimated cost: $800-1,200
Brake Master Cylinder Recall / Fluid Leak
Rare · high severity
Symptoms: Soft or spongy brake pedal, Brake pedal slowly sinks to floor when held, Visible fluid leak at master cylinder/booster junction, Brake warning light illuminated
Fix: NHTSA recall for master cylinder secondary cup seal degradation causing internal leak. Dealer replaces master cylinder and bleeds system under recall. Out-of-pocket: 2-3 hours labor plus master and fluid.
Estimated cost: $600-900
Driveshaft Coupling Failure (Recall)
Rare · high severity
Symptoms: Clunk or bang under car during acceleration or deceleration, Loss of drive power (freewheeling), Metallic grinding or rattling from center tunnel, Vehicle will not move in any gear
Fix: NHTSA recall for improperly heat-treated driveshaft coupler that can fracture. Dealer replaces driveshaft assembly under recall. If post-recall or wear-related, 2-3 hours labor for driveshaft R&R.
Estimated cost: $1,200-1,800
Owner tips
If you live where temps drop below 20°F regularly, avoid short trips under 10 minutes—let engine fully warm. Check oil level and smell monthly; if fuel smell or rising level, change oil immediately and drive longer distances.
Service transmission fluid every 30k mi (not 'lifetime' per manual) to protect cooler and valve body. Use only Honda/Acura DW-1 ATF.
Stay on top of recall notices—fuel pump and master cylinder failures are safety-critical.
Solid commuter if you live in warm climates or can avoid short cold starts; cold-climate owners face real risk of engine destruction—buy only if oil-dilution history is documented clean.
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:MASTER CYLINDER · 25V859000
2025-12-11
Honda (American Honda Motor Co.) is recalling certain 2016-2020 Acura ILX vehicles. Contaminated brake fluid may cause a seal inside the brake master cylinder to deform, which can cause an internal brake fluid leak and reduce brake function.
Consequence: Reduced brake function can extend the distance required to stop, increasing the risk of a crash or injury.
Remedy: Dealers will replace the brake master cylinder, free of charge. Interim letters notifying owners of the safety risk were mailed February 3, 2026. Additional letters will be sent once the final remedy is available, anticipated May 1, 2026. Owners may contact Honda's customer service at 1-888-234-2138. Honda's number for this recall is RN5. Vehicle Identification Numbers (VINs) involved in this recall will be searchable on NHTSA.gov beginning December 17, 2025.
The information in your report suggests that Honda (American Honda Motor Co.) may have been aware of this issue more than five business days before filing a report with NHTSA. Please be reminded that under Federal law, this agency is to be notified of all safety defect and/or noncompliance decisions within five business days. 49 CFR 573.6 Significant civil penalties can be assessed for this violation.
Honda (American Honda Motor Co.) is recalling certain 2013-2023 Honda Accord, Civic Coupe, Civic Sedan, Civic Hatchback, Civic Type R, CR-V, HR-V, Ridgeline, Odyssey, Acura ILX, MDX, MDX Hybrid, RDX, RLX, TLX, 2019-2022 Honda Insight, Passport, 2020 Honda CR-V Hybrid, 2018-2019 Honda Clarity PHEV, Fit, and 2015-2020 Honda Accord Hybrid, Pilot, Acura NSX vehicles. The fuel pump inside the fuel tank may fail.
Consequence: Fuel pump failure can cause an engine stall while driving, increasing the risk of a crash.
Remedy: Dealers will replace the fuel pump module, free of charge. Owner letters were mailed September 6, 2024. Owners may contact Honda customer service at 1-888-234-2138. Honda's numbers for this recall are KGC and KGD. This recall is an expansion of NHTSA recall numbers 21V-215 and 20V-314.
POWER TRAIN:DRIVELINE:DRIVESHAFT · 19V424000
2019-06-06
Acura (American Honda Motor Co.) is recalling certain 2016-2019 Acura ILX vehicles. Excessive grease may prevent the set-ring on the half shaft from fully engaging, allowing the driveshaft to separate from the half shaft.
Consequence: A separated driveshaft can cause the vehicle to have a loss of drive or allow the vehicle to move even while in Park, increasing the risk of a crash or injury.
Remedy: Acura will notify owners, and dealers will inspect, and, as necessary, replace the driveshaft and half shaft, free of charge. The recall began August 1, 2019. Owners may contact Acura customer service at 1-888-234-2138. Acura's number for this recall is G54.
Acura (American Honda Motor Co.) is recalling certain 2014-2019 Acura ILX vehicles. The vehicles may have a deformed fuel tank, raising the height of the fuel pump and allowing the fuel level float to stick, possibly causing the fuel gauge to display an inaccurate fuel level.
Consequence: If the fuel gauge displays that the vehicle has more gas than it actually does, the vehicle may run out of gas and stall, increasing the risk of a crash.
Remedy: Acura will notify owners, and dealers will inspect and, as necessary, replace the fuel tank, free of charge. The recall began March 14, 2019. Owners may contact Acura customer service at 1-888-234-2138. Acura's number for this recall is H3U, Z3T.
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