The most commonly reported issue for the INFINITI G35 is engine oil leaks, particularly from the rear main seal and valve-cover gaskets. Other frequent problems include automatic transmission wear, ignition/electrical faults, and aging climate-control components.
Common problems reported by G35 owners
Overview: The G35, produced from 2002 through 2006, uses the VQ35DE V6 and is generally regarded as reliable for its class. As these cars age, several issues show up with higher mileage, often tied to seals, transmission wear, ignition hardware, and electrical or climate-control systems. Below is a curated list of the issues most often cited by owners and mechanics, with brief explanations of causes, symptoms, and typical remedies.
Below is a curated list of the issues most often cited by owners and mechanics, with brief explanations of causes, symptoms, and typical remedies.
- Engine oil leaks from the rear main seal and valve-cover gaskets
- Automatic transmission problems (rough shifts, slipping, or failure to engage)
- Ignition coil packs and misfires
- Power steering rack or hose leaks
- Electrical/gauge cluster quirks and warning-light faults
- A/C compressor or blower motor failures
- Timing chain tensioner and guides wear (less common but notable)
Regular maintenance and timely attention to leaks, fluid service, and worn components can help mitigate these issues and extend the life of a G35.
Engine oil leaks and rear main seal
The VQ35DE engine used in many G35s can develop oil leaks over time, with rear main seal (RMS) leaks and valve-cover gasket leaks among the most common failure points. Symptoms include visible oil spots under the car, a burning-oil odor, or rising oil consumption. Repairs may involve resealing or replacing the rear main seal and valve-cover gaskets, and occasionally addressing related seals (oil pan, timing cover). Regularly checking oil level and addressing small leaks early can prevent more serious engine damage and reduce long-term repair costs.
Automatic transmission problems
Automatic transmissions in older G35s may exhibit rough or delayed shifting, slipping, or hard engagement as they accumulate mileage. Causes range from degraded transmission fluid and worn solenoids to valve-body wear. Diagnosis typically includes fluid inspection and a road test, followed by fluid/filter service or, in more advanced cases, solenoid replacement or a rebuild. Proactive transmission maintenance and using the correct fluid type can help extend longevity.
Ignition coil packs and misfires
Because the G35 uses a coil-on-plug ignition system, failed or aging coil packs can cause misfires, rough idle, reduced power, and fuel economy loss. Expect diagnostic trouble codes pointing to cylinder misfires. Replacement usually involves swapping out the defective coil(s) and inspecting nearby wiring. This is a common maintenance item as the car ages.
Power steering rack and hoses
Some G35 models develop leaks in the power-steering rack or associated hoses, leading to fluid loss, whining noises, or increased steering effort. Diagnosis centers on the rack, high-pressure line, and seals. Remedies range from hose replacement to full rack replacement in more severe cases. Keeping an eye on fluid level and addressing leaks early helps maintain safe, responsive steering.
Electrical and gauge issues
Owners occasionally report intermittent electrical faults, warning-light behavior, or gauge cluster anomalies as the car accrues miles. Causes can include aging clusters, wiring wear, or software/ECU quirks. Solutions vary from software updates or reflashes to component replacement or cluster refurbishments. A pre-purchase inspection can help identify these issues in used examples.
A/C and climate-control concerns
Air conditioning problems in the G35 can include compressor clutch failure, weak cooling, or blower-motor failures. These issues often surface with higher mileage and frequent use. Repairs may involve replacing the compressor, expansion valve, or blower assembly, sometimes requiring dash disassembly for blower access. Depending on the defect, costs can range widely.
Buying and maintenance considerations
For buyers of a used G35, prioritize a thorough pre-purchase inspection that focuses on the engine for leaks, the transmission’s shifting behavior, and the condition of the cooling and A/C systems. Look for a documented maintenance history, signs of prior repairs, and tools like a scan for engine misfire codes or transmission codes. Regular maintenance, addressing leaks early, and timely transmission service can help reduce the likelihood of major repair bills.
Summary
In sum, the INFINITI G35’s most common problems center on oil leaks from the RMS and valve covers, aging automatic transmissions, ignition coil failures, and electrical or climate-control components that wear with mileage. While these issues can be costly if neglected, diligent maintenance and prompt attention to leaks, misfires, and drivetrain symptoms can help keep a G35 on the road longer. For anyone considering a used G35, a detailed inspection by a qualified mechanic is essential to understand the specific condition of a given vehicle.
What year to avoid G35?
What are the worst INFINITI G35 years? The 2003 and 2004 models have more owner complaints on crowd-sourced sites like CarComplaints.com, and many G35 forums (the car has a big fan base) also find more electrical and trim issues in these early years.
What problems does G35 have?
The G35 has some minor issues with its interior accessories. One of them is the radio antenna. Some owners have complained that its plastic base can fall off after some time. It will not be easy to install a new one if that happens.
Is the G35 a fast car?
Keep the throttle planted, and the G whizzes past the quarter-mile in 14.7 seconds at 95.1 miles per hour, handily beating both of those cars (both of whom ran it in 15.1 seconds at 93.6 mph). A refined purr rises to a high-pitched snarl anywhere above 5,000 rpm. Want power and torque? This is your car.
What is the best year of G35 to buy?
Which INFINITI G35 years are the best? Overall, the G35 and its G37 successor are solidly reliable cars, but it seems like later years in each generation are more sorted out in terms of reliability and quality. Among G35s, that means roughly 2005 to 2007 versions are the best ones to go for.