The 2015 Cayenne S with the 4.8L V8 (M48.02) is a capable luxury SUV, but it's known for catastrophic engine failures due to cylinder scoring and the cooling-system-related IMS bearing issues are gone, replaced by direct injection carbon buildup and aggressive transmission oil cooler failures that can cross-contaminate fluids.
Cylinder Bore Scoring / Engine Failure
Occasional · high severity
Typical onset: 60,000-100,000 mi
Symptoms: Excessive oil consumption (more than 1 quart per 1,000 miles), Cold-start smoke from exhaust (blue-gray), Loss of compression, rough idle, misfires, Metallic noise from crankcase
Fix: Requires complete engine rebuild or short block replacement. 40-60 hours labor for R&R and rebuild with new Lokasil-coated cylinders, pistons, rings, bearings. Some shops opt for used low-mileage engine swap to save cost.
Symptoms: Transmission fluid in coolant expansion tank (milky pink coolant), Coolant in transmission pan (strawberry milkshake fluid), Harsh shifting or slipping after overheating, Check engine light with transmission fault codes
Fix: Replace transmission oil cooler, flush both cooling system and transmission multiple times, replace thermostat and coolant hoses. If contamination was severe, transmission may need rebuild. 8-12 hours for cooler and flushes, add 20-30 hours if trans needs rebuild.
Estimated cost: $2,500-4,500 (cooler only), $8,000-12,000 (with trans rebuild)
Direct Injection Carbon Buildup
Common · medium severity
Typical onset: 50,000-80,000 mi
Symptoms: Rough idle, especially when cold, Misfires on one or more cylinders (P0300-P0308), Loss of power on acceleration, Increased fuel consumption
Fix: Walnut-blast cleaning of intake valves. Remove intake manifold, mask ports, blast each valve with crushed walnut media, vacuum out debris. 6-8 hours labor. Should be done every 50-60k miles as preventive maintenance on direct-injection engines.
Estimated cost: $800-1,400
Coolant Pipe / Crossover Pipe Leaks
Common · medium severity
Typical onset: 80,000-120,000 mi
Symptoms: Coolant smell in cabin or under hood, Visible coolant leak at rear of engine (valley area), Low coolant warning light, Overheating if leak is severe
Fix: Replace plastic coolant crossover pipes in the valley between cylinder banks. Requires removing intake manifold and accessory components for access. Upgrade to updated revision pipes. 8-10 hours labor.
Estimated cost: $1,800-2,800
Transfer Case Actuator Motor Failure
Occasional · medium severity
Typical onset: 90,000-130,000 mi
Symptoms: Transfer case fault warning on dash, Stuck in 2WD or AWD mode, Grinding or clicking noise from transfer case area, Inability to shift between drive modes
Fix: Replace transfer case actuator motor (shift motor). Requires raising vehicle, removing skid plates, and accessing actuator on transfer case. Motor replacement only, no case disassembly needed. 3-4 hours labor.
Estimated cost: $1,200-1,800
Engine/Transmission Mounts Deterioration
Common · low severity
Typical onset: 60,000-100,000 mi
Symptoms: Clunk or thud when shifting from Park to Drive, Excessive vibration at idle, Engine movement visible during acceleration/deceleration, Driveline shudder during hard throttle
Fix: Replace worn hydraulic engine mounts and transmission mount. Typically front and rear engine mounts plus trans mount as a set. Requires supporting engine/trans with jack during replacement. 4-6 hours labor for all three.
Estimated cost: $1,500-2,200
Owner tips
Check oil consumption religiously—if it's drinking more than a quart every 2,000 miles, start budgeting for engine work
Walnut-blast the intake valves every 50-60k miles to prevent misfires and keep the DI engine happy
Inspect coolant and transmission fluid color at every service—milky or pink means the oil cooler is leaking and needs immediate attention before it kills the transmission
Use Porsche-approved 0W-40 oil and change it every 5,000 miles maximum despite the 10k service interval—these V8s are sensitive to oil quality
Get a pre-purchase inspection with a borescope check of cylinders if buying used—cylinder scoring is a $20k surprise you want to avoid
Fantastic to drive but a financial gamble—only buy with impeccable service records, proof of preventive carbon cleaning, and a borescope-verified healthy engine, or budget $20k for worst-case engine replacement.
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: AGM battery required; located under driver seat; requires special programming after replacement
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Control Modules — 2015 Porsche Cayenne S
Every control module on the 2015-2017 Porsche Cayenne S — 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.
Power Steering Control Unit (EPS)2.5 hr R&Rdealer / factory tool +0.8 hr▸ programming details
📍 Steering column, below dashboard
🔧 PIWIS II/III
⚠️ Electric power steering; steering angle sensor calibration required after replacement
Transmission Control Unit (TCU)2.5 hr R&Rdealer / factory tool +1.0 hr▸ programming details
📍 Transmission housing, driver side, accessed from underneath
⚠️ Battery registration required after replacement; start-stop system equipped vehicles
Kessy Control Unit / Immobilizer (KESSY)0.8 hr R&Rsecurity gateway +1.5 hr▸ programming details
📍 Dashboard, left side of steering column
🔧 PIWIS II/III + PPN online
⚠️ All keys must be reprogrammed; DME synchronization required; online authentication mandatory; component protection enforced
Seat Memory Control Unit (Seat Module)0.8 hr R&Raftermarket tool +0.2 hr▸ programming details
📍 Under driver seat, mounted to seat frame
🔧 Autel MaxiSys / PIWIS II/III
⚠️ Memory positions lost; user reprogramming required
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.
Porsche Cars North America, Inc. (Porsche) is recalling certain 2003-2020 Porsche Macan, Cayenne, Panamera, and Cayman S, 2001-2004 Boxster, Boxster S, 2004 Boxster 50 JAHRE SPYDER 550 vehicles. Please see the recall report for a complete list of all affected models and model years. The caps that cover the low-beam headlight horizontal adjustment screws are missing, which can allow the headlights to be improperly adjusted. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 108, "Lamps, Reflective Devices, and Associated Equipment."
Consequence: Improperly adjusted headlights may not illuminate the road properly, or cause a glare to oncoming drivers, which can increase the risk of a crash.
Remedy: Dealers will inspect the headlights for sealing caps and install missing caps as necessary, free of charge. Owner notification letters were mailed October 28, 2022. Owners may contact Porsche's customer service at 1-800-767-7243. Porsche's number for this recall is ANB4.
SERVICE BRAKES, HYDRAULIC:PEDALS AND LINKAGES · 16V169000
2016-03-23
Porsche Cars North America, Inc. (Porsche) is recalling certain model year 2011-2016 Cayenne vehicles manufactured April 28, 2010, to January 11, 2016. The brake pedal pivot pin may be missing a circlip, allowing the pivot pin to move and the brake pedal to dislodge.
Consequence: If the brake pedal dislodges, the driver may not be able to apply the brakes, increasing the risk of a crash.
Remedy: Porsche will notify owners, and dealers will inspect the brake pedal assembly circlip, installing any missing circlips, free of charge. The recall began on July 8, 2016. Owners may contact Porsche customer service at 1-800-767-7243. Porsche's number for this recall is AG02.
SUSPENSION · 14V824000
2014-12-29
Porsche Cars North America, Inc. (Porsche) is recalling certain model year 2015 Cayenne Diesel and Cayenne S vehicles manufactured November 26, 2014, to November 27, 2014. Due to a manufacturing error, the suspension alignment on the front and rear axles may not have been performed correctly and the screw connections of the camber, toe and caster may not have been tightened with the specified torque.
Consequence: If the suspension alignment was incorrectly performed, vehicle handling could be reduced, increasing the risk of a crash.
Remedy: Porsche will notify owners, and dealers will perform a front and rear suspension alignment, and check the screw connections for the proper torque, retightening as necessary, free of charge. The manufacturer has not yet provided a notification date. Owners may contact Porsche customer service at 1-800-767-7243. Porsche's number for this recall is AF04.
Vehicle Info — 2015 Porsche Cayenne S
Performance
Horsepower
420hp
Torque
406lb-ft
Wiper blades
Second generation (958). Changed to asymmetric front blade lengths.
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 2015 Porsche Cayenne S 3.6L twin-turbo V6 (420 hp) and can vary by trim.
🔧 Built by master technician Chris Hackleman · Master Technician · 20+ years.