Which parts fail
Components named in complaints (accelerator pedal, throttle, sudden acceleration, cruise control).
Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 2004 Infiniti G35 owners, lightly cleaned up (personal details are redacted by NHTSA).
Car has unintended acceleration that can only be stopped by turning off ignition key. This happens without warning. When stopped and foot on brake car accelerates to top rpm then brake goes to floor resulting in no control of car.
Tl* the contact owns a 2004 infinti G35. While driving 55 MPH, the vehicle experienced unintended acceleration without warning. The accelerator pedal became stuck and the engine revved rapidly. The brake pedal was depressed numerous times before the vehicle came to a stop. The engine was turned off and smoke emitted from underneath the hood. There were no flames visible. After restarting, the vehicle resumed normal operation. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was 120,000.
I experienced 'sudden' or 'unintended' acceleration with my 2004 Infiniti G35 coupe twice in the last 3 months. The first time, in February or early March, my wife and I were at an intersection waiting for the left turn light. The car was stopped. All of a sudden the car's motor began to rev up. I pressed firmly on the brake so the car wouldn't move and shifted into neutral (it's an automatic). The car revved up alarmingly. I shut off the ignition. When the light changed, I restarted the car; all was normal. We continued on home. The only reason I didn't run into the person in front of me was because my foot was firmly on the brake. On April 3, 2007, I was backing into a parking space. The care was drifting at idle in reverse and my foot was on the brake. Again, the engine began to race and I hit the car behind me -- not very hard because it was very close. …
Tl* the contact owns a 2004 Infiniti G35. While driving various speeds, the contact depressed the brake pedal, but the vehicle independently accelerated rapidly without warning. The contact stated that the failure occurred at least nine times. Nalley Infiniti in marietta, georgia was made aware of the failure and requested that the vehicle be brought in for diagnostic testing. The manufacturer was made aware of the failure. The vehicle was not diagnosed or repaired. The failure mileage was 8,000.
Tl* the contact owns a 2004 infinit G35. While driving at approximately 45 MPH, the vehicle accelerated independently and suddenly decelerated to 10 MPH as the service engine light illuminated. The contact coasted to the emergency lane and shut the vehicle off. The vehicle restarted and the failure persisted. The vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The failure mileage was 208,000.
While driving 3 warning lights come on (vacation, no slip, and check engine) then I loose control of acceleration. I had the check engine code read and the code is p2138, which is the throttle control/ pedal position sensor
I'm astoundingly concerned about the safety of this vehicle. This is the second 2004 G35 I've owned and the first one I purchased brand new, owned 9 years, drove 230,000 miles and had none of these issues/failures when it was sold to a happy new owner ... Although it was a g35x. This is how I know these are in fact failures/defects in this second one. This vehicle has not experienced any recent damage or known problems, yet the last few days every time it has been started, the airbag light is remaining lit for an extended period of time before it decides to go off on the dash. It lingers and then finally goes out. It has been very rainy and humid here for an extended period and we are a state targeted for Takata recall, but this vehicle is "not one" allegedly. I fear for my safety! …
While driving at any speed it will suddenly go into "slip " mode. The service engine, vdc off, and slip warning lights come on, the accelerator stops functioning and the engine coasts. This is extremely dangerous in traffic. There is an active campaign that I have included below on the same vehichles the previous year and some from 2004. When I contacted Infiniti multiple times about my vehicle with the same problem they refused to include my car. Summary: on certain passenger vehicles, the circuit board for the crank position sensor or cam position sensor May have an improper solder joint due to solder deformation caused by heat stress accelerated by the existence of flux residue during the soldering process. …
2004 Infiniti G35 lost power when driving. Service engine soon light as well as vdc lights are on. It is hesitant to start after that. Has happened at least one time each during the last three times the car was driven. Major safety issue as the it has happened when turning at a major intersection. Luckily we were able to coast the car to the side of the road. Same issue exist on the 2003 G35 in which there was a recall for, but none exists for the 2004 models. Contacted infinit in which I was told there was no active campaigns for my model, except for the side airbags. Was told that this would be treated as a repair (subject to very high dealer costs) and not a recall. I have found many other post on the internet with the same issue for the same model and the same complaint that it is not addressed by Infiniti. …
Hello I purchased a 2004 Infiniti G35 sedan from star max in orlando fl east colonial drive I've only had it 3 days tops , first of all I left and the gas gauge isn't working or the speedometer , also my radio keeps going in and out my left window seems to go up and down when it wants too, my tire pressure lights on and my cars making a very funny roaring noise in the back. Also when I go to make turns ,my wheel just keeps turning on its own and hard to turn back straight it locks up . And I believe there May be a fuel pump issue as well I've spoken to several sales men there and complained saying I need to fix things the right way or I need a different car im paying $325 a month way out of my budget on a buy here pay here car that's not even worth it at this moment in time. Please someone help me I need to do something about this fast!
Acceleration complaints in other G35 years
Frequently asked questions
How common are acceleration problems on the 2004 Infiniti G35?
NHTSA has 20 complaints about the speed control & acceleration of the 2004 Infiniti G35, 8% of the model year's 244 complaints. The component named most often is accelerator pedal (2 mentions).
Is there a recall for 2004 Infiniti G35 acceleration problems?
No. NHTSA lists no speed control & acceleration recall for the 2004 Infiniti G35, though it has 1 recall for other components. If the problem is widespread, a repair may still be covered by an extended warranty or a manufacturer service bulletin — ask a dealer.
At what mileage do 2004 Infiniti G35 acceleration problems start?
Half of the complaints with a recorded mileage happened before about 57,000 miles, and 33% before 25,000 miles.
Is it dangerous?
Owners linked 3 crashes, 1 fire and 1 injury to speed control & acceleration problems on this model year. If you notice symptoms, have the car checked before driving further.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.