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EnginePart report

2003 Infiniti Q45 Engine Problems

Complaints
6about this part
Share
50%of 12 total for the year
Median mileage
103,000miles
Trend
Not enough dataFewer than 15 complaints, too few for a reliable trend.

NHTSA recorded 6 complaints about the engine of the 2003 Infiniti Q45, 50% of the 12 complaints for this model year. Where a mileage was given, the median is 103,000 miles.

Fewer than 15 complaints name this part, so treat the figures as a rough indication only.

Example complaints

Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.

“I own a 2003 infinity Q45 and without warning this vehicle stalls where ever it wants at a light while you driving on a major highway on a major street no warning what so ever and infinity is aware of the problem but they only want to help certain VIN numbers. I took my family skiing to scranton pa and on interstate i80 the car stall without warning my entire family could have been killed. Please do something about this is a big issue and before someone gets hurt or killed someone should help.”

NHTSA complaint #10702990, filed 2015-03, 94,000 miles

“The circuit board for crank position sensor and cam position sensor have improper solder joints. This has caused the service engine light to come on, the engine may not start, power reduces, engine stalls at a traffic light or while in motion, on a city street or highway or while making a turn. This is also a common problem with the 2002 Infiniti m45, Q45; 2003 Infiniti i35, m45; 2003 nissan altima, maxima, murano, sentra. There are 11 consumer complaints, 3 investigations and 33 service bulletins regarding this issue with the 2003 Q45. Infiniti/nissan recall # 03v455000”

NHTSA complaint #11415335, filed 2021-05, 186,241 miles

“Start car first thing in the am. Driving normal. Within 5 miles engine shuts off without warning. Loose all power. No code appears. Auto will not start. Finally starts after 5 or 6 tries. This problem has continued to occur every two or three days over the last six months. But auto starts immediately after. Auto and transmission are not performing properly. Now the engine stall while driving is happening on a daily basis. Auto has been checked out at george harte Infiniti, west haven, ct at least five times. Dealership claims they cannot address the problem because no error code appears. …”

NHTSA complaint #10777700, filed 2015-09, 112,000 miles

“The contact owns a 2003 Infiniti Q45. The contact stated that while driving 35 MPH, the steering wheel seized and there was a sudden loss of power. The vehicle was able to restart and resumed to normal. The failure occurred on three occasions. The dealer repaired the vehicle but the failure recurred. The manufacturer was not made aware of the failure. The failure mileage was 80,000 and the current mileage was 97,000.”

NHTSA complaint #10610755, filed 2014-07, 80,000 miles

“The contact owns a 2003 Infiniti Q45. While driving 35 MPH, the vehicle stalled and the service engine warning indicator illuminated. The contact was able to restart the vehicle after several attempts. The vehicle was taken to an independent mechanic where it was diagnosed that the camshaft position sensor failed and needed replacement. The vehicle was not repaired. The dealer was not contacted. The manufacturer was made aware of the failure and informed the contact that the VIN was not included in NHTSA campaign number: 03v455000 (engine and engine cooling). …”

NHTSA complaint #11051157, filed 2017-11, 150,000 miles

Engine: other model years

YearComplaintsShare of year
2004229%
2003650%

Other parts of the 2003 Infiniti Q45

Electrical system
3 complaints
Steering
3 complaints
Brakes
2 complaints
Electronic stability control
2 complaints
Engine cooling
1 complaints
Seat belts
1 complaints
Transmission and drivetrain
1 complaints
Vehicle speed control
1 complaints

← All problems reported for the 2003 Infiniti Q45

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 30, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.

To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology