Common problems reported for the 2005 Infiniti G35 focus on transmission reliability, engine oil/leak issues, electrical and HVAC quirks, and wear on suspension and braking components. With proper maintenance, these cars can remain dependable, but age and mileage increase the likelihood of repairs.
These vehicles are part of Infiniti’s first-generation G35 lineup that uses the VQ35DE V6 and a 5-speed automatic transmission (manual transmission was available on some trimmed models). While generally regarded as durable, owners often encounter certain failure modes as the car accrues miles. The following sections outline the most commonly reported problems, what to look for, and how to address them.
Transmission and Drivetrain
Overview of common transmission and driveline issues reported by owners and technicians.
Common failure points
- Harsh or delayed shifting in the 5-speed automatic transmission, especially at higher miles. Could indicate valve body wear, worn solenoids, or degraded hydraulic circuitry.
- Transmission fluid leaks from the pan gasket, cooler lines, or seals. Fluid quality and level should be checked regularly; burnt or dark fluid can precede shifting problems.
- Torque converter shudder or slipping in some conditions, which may require diagnostics or transmission service.
- Rear differential leaks or noise in older units, sometimes accompanying lifting or braking events.
- Manual transmission wear in 6-speed variants (less common in automatic-only trims): clutch wear leading to slipping or difficulty engaging gears.
Conclusion: Transmission and driveline issues are among the more frequently reported problems as the G35 ages. Regular fluid maintenance and prompt diagnosis of shifting anomalies can help avoid more extensive damage.
Engine, Oil, and Fuel System
Overview of engine-related concerns that tend to surface with higher mileage.
What to watch for
- Oil consumption and leaks. Some engines burn or leak oil as seals, gaskets, and PCV components age; owners should monitor oil level and top off as needed, and look for consistent consumption rather than sudden spikes.
- Valve cover gasket leaks and other gasket/seal leaks around the VQ35DE engine bay area.
- Ignition coil or spark plug-related misfires, which can trigger rough running or fault codes; coil-on-plug setups are common failures in aging engines.
- Timing chain/tensioner wear or slack and occasional ticking or rattle at start-up; although less common, it can become a concern with high-mileage examples.
- Exhaust manifold cracks or leaks and cooling system leaks (radiator end tanks, heater hoses) that can lead to overheating or smells.
Conclusion: Engine-related issues typically involve seals, ignition components, and occasional timing-chain-related wear. Early detection through regular inspection can prevent more serious damage and expensive repairs.
Electrical, Electronics, and HVAC
Electrical quirks and climate-control problems are a frequent source of frustration on older G35s.
Key concerns
- Dashboard/instrument cluster faults, dimming gauges, or intermittently failing displays, which can be intermittent but disruptive.
- Power window regulator failures, seat memory or related electrical glitches, common in aging interiors.
- ABS/traction control warning lights from faulty wheel speed sensors or related control modules; scan for stored codes to pinpoint the source.
- Air conditioning compressor clutch wear, refrigerant leaks, or reduced cooling capacity, which can become noticeable in hot weather.
- Radio or infotainment reliability issues and general ECU/wiring gremlins typical of older vehicles.
Conclusion: Electrical and HVAC problems often reflect age-related wear and loose connections. A thorough electrical diagnostic and testing of fuses, grounds, and sensors helps isolate issues and reduce nuisance repairs.
Brakes, Steering, and Suspension
Wear-and-tear on structural and suspension components is common as miles accumulate.
What to inspect
- Brake rotor warping or pulsing under braking, often due to aging rotors, pads, or heat cycling.
- Power steering rack leaks or play, which can manifest as fluid loss, steering feel changes, or noise.
- Control arm, subframe, and trailing arm bushings wearing out, causing clunking noises, misalignment, or loose handling.
- CV joints, boots, and axle-related noises or vibrations, particularly on higher-mileage cars.
Conclusion: Brakes, steering, and suspension components tend to show wear with mileage. Regular inspection and timely replacement of worn bushings, joints, and rotors help maintain handling and safety.
Maintenance, Recalls, and Practical Tips
Practical guidance to evaluate a used 2005 G35 and reduce ownership risk.
- Obtain a pre-purchase inspection by a qualified mechanic who is familiar with Infiniti/Nissan platforms and the VQ35DE engine.
- Review service history for regular oil changes, transmission service, cooling system work, and any timing-chain/valve-train related service if applicable.
- Check for recalls using the VIN and verify adherence to any service campaigns with a dealership.
- Inspect for signs of oil or coolant leaks in the garage and listen for abnormal noises from the transmission, engine, or suspension.
- Test drive to evaluate shifting quality, braking feel, steering response, and HVAC performance across temperature ranges.
Conclusion: A well-documented maintenance history and a clean inspection can greatly improve confidence in a 2005 G35’s reliability and future repair costs.
Summary
The 2005 Infiniti G35 is generally considered a durable luxury sport sedan, but age and mileage bring a set of common issues: transmission and driveline problems are among the most frequently reported, followed by engine oil consumption and gasket leaks, electrical and HVAC quirks, and wear in brakes, steering, and suspension. Regular maintenance, timely repairs, and a thorough pre-purchase inspection can significantly reduce the risk of unexpected failures and help preserve the G35’s performance and value.