The 2023 CT4-V with the 2.7L turbo four (LSY engine) is still relatively new but has shown concerning early patterns of catastrophic engine failures tied to oil consumption and turbocharger/fueling issues, plus some routine 10-speed transmission complaints typical of the platform.
Symptoms: Check engine light with low oil pressure codes, Metallic knocking or rattling from bottom end, Severe oil consumption between changes (1 qt per 1,000 mi or worse), Engine seizure or sudden loss of power
Fix: Complete short block replacement or engine rebuild required. Involves dropping subframe, removing engine, replacing crankshaft, main bearings, connecting rod bearings, pistons, and rings. TSBs point to oil delivery issues under high boost or inadequate piston ring sealing. 25-35 labor hours for short block swap.
Estimated cost: $8,000-15,000
Excessive Oil Consumption - Piston Ring / Bore Issues
Common · medium severity
Typical onset: 10,000-40,000 mi
Symptoms: Burning through 1+ quart of oil every 1,500-2,000 miles, Blue smoke on cold start or acceleration, Fouled spark plugs, Oil level low warnings despite recent changes
Fix: If caught early, some dealers attempt piston ring replacement and cylinder honing without full rebuild. Requires head removal, cylinder honing, new piston rings on all four cylinders. 18-24 hours labor. Often warranty-covered if under 60k miles, but out-of-pocket it's costly.
Estimated cost: $5,000-8,000
Transmission Oil Cooler Line Leaks
Occasional · medium severity
Typical onset: 20,000-60,000 mi
Symptoms: Transmission fluid puddles under vehicle, Burnt transmission fluid smell, Slipping or delayed shifts when fluid runs low, Low transmission fluid warning
Fix: Replace transmission oil cooler lines and sometimes the cooler itself. Lines run along subframe and can crack at fittings or corrode. Requires raising vehicle, draining fluid, replacing lines, refilling and checking for leaks. 3-5 hours labor.
Estimated cost: $600-1,200
Transmission Mount Failure
Occasional · low severity
Typical onset: 30,000-70,000 mi
Symptoms: Clunking on acceleration or deceleration, Excessive driveline vibration, Harsh or jerky shifts, Visible sagging or torn rubber on transmission mount
Fix: Replace transmission mount. Common on 10-speed transmissions in performance applications due to torque loads. Involves supporting transmission, removing old mount, installing new. 1.5-2.5 hours labor.
Estimated cost: $300-600
Turbocharger Wastegate Rattle / Actuator Failure
Occasional · medium severity
Typical onset: 25,000-60,000 mi
Symptoms: Rattling noise from engine bay at idle or light throttle, Check engine light with boost control codes (P0299, P0234), Loss of power or sluggish acceleration, Turbo flutter or surge
Fix: Wastegate actuator or internal wastegate linkage failure. Sometimes repairable with actuator replacement, but often requires full turbocharger replacement on the LSY. Turbo is integrated into exhaust manifold. 8-12 hours labor including coolant and oil drain/refill.
Estimated cost: $2,500-4,500
Fuel System Issues - High Pressure Fuel Pump / Injectors
Rare · high severity
Typical onset: 30,000-80,000 mi
Symptoms: Hard starting or long crank times, Misfires under load (especially cylinder-specific codes), Loss of power at high RPM, Fuel pressure fault codes (P0087, P0191)
Fix: High-pressure fuel pump on the 2.7T can fail, or direct injectors can clog/fail. Pump replacement involves removing intake manifold and accessories. Injector replacement requires valve cover removal. Pump: 4-6 hours. All injectors: 6-8 hours.
Estimated cost: $1,800-3,500
Owner tips
Check oil level every 500-1,000 miles religiously — the 2.7T is known for consumption; catching it early can prevent bearing failure
Use only Dexos-approved full synthetic oil and change every 5,000 miles max, especially if driven hard
Monitor transmission fluid condition — the 10-speed runs hot; consider auxiliary cooler if tracked or towing
Let the turbo cool down with 30-60 seconds of idle before shutdown after spirited driving
Keep records of all oil consumption complaints while under warranty — GM has extended coverage on some LSY engine failures but documentation is critical
Buy with caution and only with comprehensive warranty — the LSY engine has shown alarming early failure rates that can grenade your budget; wait a model year or two for GM to sort it out.
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 for start-stop system; located in trunk
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Every control module on the 2020-2026 Cadillac CT4-V — 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 seat memory and heating/ventilation functions; two modules (driver/passenger)
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.
EXTERIOR LIGHTING:LIGHTING CONTROL MODULE:SOFTWARE · 22V903000
2022-12-08
General Motors, LLC (GM) is recalling certain 2020-2023 Cadillac CT4 and CT5; 2021-2023 Buick Envision; and 2022-2023 Cadillac Escalade and Escalade ESV, Chevrolet Silverado 1500, Suburban, Tahoe, GMC Sierra 1500, Yukon, and Yukon XL vehicles. The daytime running lights (DRLs) may not deactivate when the headlights are on. 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: DRLs that do not deactivate as intended may result in a glare, reducing visibility, and increasing the risk of a crash.
Remedy: The body control module software will be updated by a dealer, or through an over-the-air (OTA) update, free of charge. Owner notification letters were mailed January 23, 2023. Owners may contact GMC customer service at 1-888-988-7267, Chevrolet customer service at 1-800-222-1020, or Cadillac customer service at 1-800-458-8006. GM's number for this recall is N222386380. This recall expands previous recall number 22V-827.
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 2023 Cadillac CT4-V 2.7L Turbo I4 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.