Which parts fail
Components named in complaints (engine, cooling system, oil leaks, timing chain, exhaust).
Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 2003 Infiniti G35 owners, lightly cleaned up (personal details are redacted by NHTSA).
Twice while driving approximately 70 mph on the freeway, the engine shut off without warning and the service engine soon warning indicator illuminated. The vehicle coasted. There was no shoulder to pull over to. I put it in neutral and it restarted. The vehicle was taken to an independent mechanic where it was diagnosed that the camshaft and crank sensor failed. I looked online and saw a recall for the cam shaft and crank sensors for the, 2003 Infiniti G35. However, when I called, I was told that my vin was not included in the recall. The failure mileage was 230,000.
The car engine cuts off / stalls while driving. This has happened multiple times. When driving on highway, the engine stops running, the car loses all power, and it is very difficult to restart the car. I had the car inspected and the local mechanic stated the crankshaft sensor/ camshaft censor is not working properly and he believed this was on recall, but Infiniti stated that my car is not covered. This is extremely dangerous - call stalls in the middle of the road with no power at all.
Hello, my 2003 Infiniti G35 coupe is experiencing the exact issue that NHTSA campaign number:03V455000 (Infiniti recall no. R3021) describes for the crank/cam shaft position sensors. My car will literally just die while driving at any given time! My steering wheel locks up, and I have to pull over with a stiff steering wheel to turn my car off & restart it. Sometimes, the car won't start becuase of the same issue. However, my local Infiniti dealer and the Infiniti customer service line have both informed me that they cannot fix this issue becuase my VIN was not listed on that recall. I bought this car around 6-7 years ago, so I would not have even been able to take it in to get fixed since they noted it was only 2003 for a certain time. This just recently started happening a few months ago, and I finally found the exact issue on your website. …
Tl* the contact owns a 2003 Infiniti G35. While driving low speeds, the vehicle stalled and an unknown warning indicator illuminated. The vehicle was able to restart. The vehicle was diagnosed by an unknown dealer, but the contact was unaware of the results. The vehicle was not repaired. The contact stated that the vehicle was experiencing the same failure as listed in NHTSA campaign number: 03V455000 (engine and engine cooling). The manufacturer was notified and did not assist. The failure mileage was 80,000. The consumer stated the vehicle was repaired but, could not be calibrated because of the defect with the cam sensor and wiring that was a recall in 2003. The consumer stated the instrument panel and heating/cooling remained unrepaired. The consumer stated the air condition would not turn off even in the winter. …
Tl* the contact owns a 2003 Infiniti G35 sedan. The contact stated that while making a left turn at an intersection to the highway the vehicle seized with the check engine warning light illuminated. The contact managed to veer to the shoulder of the roadway. The vehicle was turned off and back on operated as designed. The vehicle was taken to an independent mechanic where it was diagnosed and determined that the engine failed an needed to be replaced. The vehicle was not repaired. The failure recurred. The dealer (louisville Infiniti 8 autocenter dr, louisville, ky 40299 [phone]) was contacted about the failure and confirmed that the vehicle was not subjected to any recalls. The manufacturer was made aware of the failure and informed. The failure mileage was approximately 23,000.
Tl* the contact owns a 2003 Infiniti G35. The contact stated that the vehicle stalled and was difficult to restart. In addition, there was fuel leaking and the vehicle would not properly refuel. The check engine, the vdc, and the slip warning indicators illuminated. The vehicle was taken to the dealer where it was diagnosed that the fuel filler hose was cracked and needed to be replaced. The vehicle was not repaired. The vehicle was taken to an independent mechanic where it was diagnosed that the camshaft sensor needed to be replaced. The manufacturer was notified of the failure. The contact referenced NHTSA campaign numbers: 03V455000 (engine and engine cooling) and 05V555000(fuel system, gasoline). The failure mileage was approximately 60,000.
While driving, the vehicle turned off on 2 occasions. On several occasions, it lost power, and then recovered, but twice, it literally turned completely off. The "slip", "vdc off", and "service engine soon" lights all appeared. I took it to my local Infiniti dealer who said it was subject to a recall for earlier-produced models, and subject to a bulletin which described exactly what had happened. The crank position sensor and bank 1 and 2 of the cam position sensors had to be replaced at a cost of $563.03, and Infiniti says that without NHTSA telling them to pay for it, they refuse. This car is a 2003, however, it is in mint condition with less than 55,000 original miles on it--always dealer maintained.
Tl* the contact owns a 2003 infinti G35. The contact stated that while driving at various speeds , the engine stalled while all the warning lights illuminated. The failure occurred intermittently. The vehicle was taken to a dealer where it was diagnosed that the crank shaft sensor failed and needed to be replaced. The vehicle was repaired however, the failure recurred. The VIN was not included in NHTSA campaign: 03V455000 (engine and engine cooling). The vehicle was taken to an independent mechanic where it was diagnosed that the camshaft sensor failed and needed to be repaired. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was approximately 138,000.
Tl* the contact owns a 2003 Infiniti G35. While driving approximately 20 MPH, the vehicle stalled, the check engine soon, vdc, slip, and brake warning lights illuminated. The vehicle switched from the neutral to the drive gear. The contact had to maneuver to the side of the road to a complete stop. The engine shut down. The vehicle was restarted normally and driven to the contact's residence. The vehicle was taken to an independent mechanic who stated that the crank position sensor needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The contact also stated that the failure recurred five other times. The approximate failure mileage was 165,582.
Tl* the contact owns a 2003 Infiniti G35. The contact stated that the engine made ticking and knocking noises. Also, the vehicle idled too low as if it were going to shut off independently. The service engine soon indicator illuminated on the instrument panel. The vehicle was taken to an independent mechanic where it was diagnosed that the camshaft position sensor and valve timing control sensor failed due to an improper solder joint, and would need to be replaced. The vehicle was not repaired. The VIN was not included in NHTSA campaign number: 03V455000 (engine and engine cooling). The manufacturer was notified of the failure. The approximate failure mileage was 143,000.
Related recalls
Engine and engine cooling
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.
Remedy: Dealers will replace the crank position sensors. Camshaft position sensor(s), and in some cases, the variable timing control sensor(s).
Engine complaints in other G35 years
Frequently asked questions
How common are engine problems on the 2003 Infiniti G35?
NHTSA has 122 complaints about the engine & cooling of the 2003 Infiniti G35, 23% of the model year's 533 complaints. The component named most often is engine (8 mentions).
Is there a recall for 2003 Infiniti G35 engine problems?
Yes — NHTSA recall 03V-455 (engine and engine cooling, Nov 17, 2003). Recall repairs are free at authorized dealers.
At what mileage do 2003 Infiniti G35 engine problems start?
Half of the complaints with a recorded mileage happened before about 102,000 miles, and 2% before 25,000 miles.
Is it dangerous?
Owners linked 1 crash, 2 fires and 0 injuries to engine & cooling 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.