Model year report

2009 Infiniti G37: what breaks, and at what mileage

What breaks on the 2009 Infiniti G37

On the 2009 Infiniti G37, the failure owners report most often is airbag warning light or occupant sensor fault, and the reports cluster around 72,500 miles. The earliest to appear is other speed control problem, reported by a median of 55,000 miles. Overall it scores 70 out of 100, high risk for a 2009.

High risk for a 2009 — 136th riskiest of the 295 2009 vehicles we can rate. 215 owner reports; fleet size borrowed from other years of the same model.

The failures owners actually file about

Owners have reported 30 named failure modes on the 2009 Infiniti G37, and the three most-reported carry 35% of everything filed.

Airbag warning light or occupant sensor fault leads with 49 reports, about 82 per 1,000 vehicles and with the middle half of reports between 57k to 87,500 miles.

Other engine problem follows with 16 reports, usually reported between 28k to 115,000 miles.

Other body or interior problem follows with 11 reports, usually reported between 46k to 95,000 miles.

By system, the reports fall mostly into airbag (55), engine (29) and electrical (13).

When these failures get reported

160 of the reports on the 2009 Infiniti G37 came with an odometer reading, and half of those were filed before 68,000 miles.

Cumulatively, 33% by 50,000 miles, 75% by 100,000 miles and 94% by 150,000 miles of the dated reports had been filed.

The busiest stretch is between 70,000 and 80,000 miles, which alone holds 14% of the dated reports.

28% of the dated reports were filed below 36,000 miles.

In the order they tend to show up: other speed control problem around 53k, other engine problem around 65k, other body or interior problem around 71k and airbag warning light or occupant sensor fault around 73k.

Median

Airbag warning light or occupant sensor fault

73k
Other engine problem

65k
Other body or interior problem

71k
Other speed control problem

53k
Other powertrain problem

60k
No-start or intermittent start failure

19k
Control module (ECM/PCM/BCM) failure

39k
Airbag inflator rupture

77k
Other electrical problem

67k
Differential or transfer case failure

4k
Other brake problem

28k
Other visibility problem

67k

Tick median reported mileage Solid middle half of reports Faint 10th to 90th percentile Colour how bad the failure is when it happens

Showing the 12 most-reported failure modes of 30. The full list is in the table below.

How reports accumulate

Share of reports filed by each mileage

half by 67.6k

Every report with an odometer reading, cumulative, from 0 to 200,000 miles. A curve that climbs early is a car with early problems, whatever its total.

Line share of reports filed by that mileage
Dashed the median reported mileage

Severity, and what it costs

Across the named modes, 7 mention a crash. Those are the words owners used in their own complaints, and NHTSA does not verify them, but they are the closest thing in this data to a measure of what a failure actually did.

The average severity weight across every report on this year is 3.65, where a stalled engine or a failed airbag weighs many times more than a rattling trim panel, and a figure this high means the reports are dominated by failures with safety consequences rather than annoyances. The weighting is set out in full on the methodology page.

What the top failures cost to put right, as editorial estimates for an independent US shop rather than figures from NHTSA: airbag warning light or occupant sensor fault at $300–$1,600, other engine problem at $300–$4,000, other body or interior problem at $200–$2,000 and other speed control problem at $250–$2,000. Dealer labour, a seized bolt or a part that is no longer made can push any of these past the top of its range.

20% of the reports on this year sit in the engine, transmission, drivetrain or cooling systems — the four where a repair bill is usually four figures.

Every reported failure mode

Mileage figures are percentiles of owner-reported readings. Click a column to sort.
Failure mode	System	Reports	With reading	25th	Median	75th	Per 1,000	Typical repair	Severity
Airbag warning light or occupant sensor fault	airbag	49	31	57k	73k	87k	82.2	$300–$1,600	High
Other engine problem	engine	16	14	28k	65k	115k	26.8	$300–$4,000	High
Other body or interior problem	body	11	9	46k	71k	96k	18.5	$200–$2,000	Moderate
Other speed control problem	adas	9	8	18k	53k	121k	15.1	$250–$2,000	Critical
Other powertrain problem	transmission	8	6	—	60k	—	13.4	$400–$4,500	High
No-start or intermittent start failure	engine	6	6	—	19k	—	10.1	$200–$1,800	Moderate
Control module (ECM/PCM/BCM) failure	electrical	6	6	—	39k	—	10.1	$700–$3,000	High
Airbag inflator rupture	airbag	5	2	—	77k	—	8.4	$0–$0	Critical
Other electrical problem	electrical	5	3	—	67k	—	8.4	$250–$2,000	Moderate
Differential or transfer case failure	drivetrain	4	3	—	4k	—	6.7	$900–$4,200	High
Other brake problem	brakes	4	4	—	28k	—	6.7	$300–$1,800	High
Other visibility problem	glass	4	4	—	67k	—	6.7	$150–$1,400	Moderate
Stalling while driving	engine	3	3	—	120k	—	5.0	$300–$2,500	Critical
Loss of power steering	steering	3	0	—	—	—	5.0	$600–$2,800	Critical
Control arm, ball joint or bushing failure	suspension	3	2	—	53k	—	5.0	$400–$2,200	High
Timing chain, belt or tensioner failure	engine	2	2	—	117k	—	3.4	$1,200–$4,500	Critical
Misfire or rough idle	engine	2	2	—	28k	—	3.4	$250–$1,600	Moderate
Complete transmission failure	transmission	2	2	—	3k	—	3.4	$2,800–$8,000	Critical
Engine sensor failure	electrical	2	2	—	126k	—	3.4	$180–$900	Moderate
Software fault or failed update	software	2	2	—	7k	—	3.4	$0–$600	Moderate
Overheating	cooling	1	1	—	15k	—	1.7	$400–$3,500	High
Seat belt or retractor failure	airbag	1	1	—	124k	—	1.7	$200–$900	High
Steering rack, gear or tie rod failure	steering	1	1	—	79k	—	1.7	$700–$2,600	High
Steering column or shaft failure	steering	1	0	—	—	—	1.7	$600–$2,500	Critical
Tire pressure monitor failure	wheels	1	1	—	108k	—	1.7	$80–$600	Low
Sunroof failure or glass breakage	body	1	1	—	125k	—	1.7	$700–$4,500	High
Other fuel system problem	fuel	1	0	—	—	—	1.7	$300–$2,200	High
Other steering problem	steering	1	1	—	75k	—	1.7	$350–$2,400	High
Other suspension problem	suspension	1	1	—	75k	—	1.7	$350–$2,000	Moderate
Other wheel or tire problem	wheels	1	0	—	—	—	1.7	$200–$1,500	High
Unclassified problem	other	59	42	54k	71k	90k	99.0	—	Moderate

This year had no usable recall paperwork, so the fleet-size estimate is the median of other years of the same model. Repair costs are typical independent-shop ranges for the failure, not figures from these reports.

How often, against how many were built

Scaled by an estimate of how many of these cars exist, the 2009 Infiniti G37 draws about 361 per 1,000 vehicles, which puts it in the 98th percentile of complaint rates among 2009 vehicles we can rate.

That denominator is the weakest number on the page and it is fair to say so plainly. This year had no usable recall paperwork, so the fleet-size estimate is the median of other years of the same model.

The working figure is 596 vehicles. If the true number is twice that, every rate on this page is half what it says; the ranking against other 2009 vehicles, which is what the risk score uses, is far more robust than the rate itself.

What owners wrote

Verbatim from NHTSA complaint narratives, trimmed for length. The odometer reading is the one the owner gave.

Airbag warning light or occupant sensor fault

This is a frequent event that I just noticed a few months ago. When someone is in the front passenger seat of the vehicle, the airbag light comes on indicating that the passenger airbag is off. This occurs anytime a passenger sits in the front seat, regardless of weight or height. Today I also noticed that nissan has issued a recall for 1,053,479 vehicles globally for similar issues. However, my vehicle isn't included in this recall however there have been multiple reports of older model g35/g37 vehicles with the exact same issue. I think that my 2009 infiniti g37 should be included in this recall as well. I'm very concerned about this, because this is a huge safety issue! *tr

103,000 miles NHTSA complaint 1049777 filed 2014-03-26

Pass air bag light came on as it is malfunctioning. It will not go off. Took it to dealer in greenville sc they said that the sensor in the seat is likely the problem but did not know for sure. Cost would be between $1500 and $3000 to replace. I called infinity service nationwide they said there is no recall. I see on this reporting website that this is happening to others and that it also was an issue with the 2008 g35 and that for the 2008 it is a recall issue. This should be a recall for the 2009 g37 also.

64,000 miles NHTSA complaint 1187933 filed 2015-06-03

How it ranks in the 2009 field

The score at the top of the page, placed among its peers. The zones are the same thresholds the scorer applies, read out of the scorer itself, so the picture and the band word cannot disagree.

Risk score against the rest of the 2009 field

Scores are ranked within the model year, never across years, because an older car has had longer to accumulate reports.

Left fewer and less serious reports
Right more, or worse
Marker this vehicle

Better and worse years of the same car

High risk for a 2009 — 136th riskiest of the 295 2009 vehicles we can rate. Every score on this site is a rank inside its own model year, which is what makes a 2004 and a 2019 comparable at all.

Across the 6 model years of this car that carry enough reports to score, 2008 comes out best at 64 and 2012 worst at 76, with 2009 itself at 70.

If the model year is negotiable, 2008 scores lower than 2009 by a margin worth acting on. Same body, same engines, different luck — usually a supplier change or a mid-cycle fix, which the complaint data can show but never explain.

Within the 2007–2013 generation specifically, 2008 is the strongest year at 64 and 2012 the weakest at 76.

Scores compare each year against other cars of the same model year, so a low number on an older car is a real result and not an artefact of age.

Risk score by model year, out of 100

Shorter is better. Years with too few reports to score are shown without a bar rather than as a zero, because no data is not good news.

Within the 2007-2013 generation, 2008 Infiniti G37 scores best at 64 and 2012 Infiniti G37 worst at 76.

Where to spend the inspection money

The mileages below are where the first quarter of reports for each mode had already been filed, which makes them the point at which a fault is worth looking for rather than the point at which it happens: other speed control problem from about 18k, other engine problem from about 28k, other body or interior problem from about 46k and airbag warning light or occupant sensor fault from about 57k.

On a 2009 Infiniti G37 with more miles than that on it, the useful question to put to a seller or a mechanic is whether other speed control problem has been dealt with, and if so with what parts and at whose expense. A car that has already had the repair is in a different position from one that has not.

None of this is a diagnosis. It is a list of what other owners of the same model year reported, ordered by when they reported it, which is a good place to point an inspection and a poor place to stop.

What this page cannot tell you

215 owner reports; fleet size borrowed from other years of the same model. Every count on this page is therefore a floor: it is the number of owners who went to the trouble of filing with a federal agency, which is a small and self-selected fraction of the owners who had the fault.

Of those 215 reports, 160 carried an odometer reading, so the mileages here describe 74% of the sample rather than all of it. Owners also round: readings pile up on multiples of ten thousand, which is why this site publishes "about 90,000 miles" and not "91,438".

Named failure modes come from matching phrases in the complaint text, so a badly worded complaint can land in the wrong bucket. The effect washes out across hundreds of reports and does not wash out across five.

And nothing here predicts what one car will do. These are other people's complaints, filed years apart, on cars maintained by strangers. Read the page as a map of where this model year has previously gone wrong, then have the specific car in front of you inspected.

Questions this page answers

What are the most common problems with the 2009 Infiniti G37?

The most-reported failures are airbag warning light or occupant sensor fault (49 reports, median 72,500 miles), other engine problem (16 reports, median 65,000 miles) and other body or interior problem (11 reports, median 70,000 miles). Counts come from owner complaints filed with NHTSA, which are voluntary, so they show what owners bothered to report rather than every fault that occurred.

At what mileage do 2009 Infiniti G37 problems start?

Other speed control problem is the earliest failure mode to show up, with a median reported mileage of 55,000 miles and a quarter of reports before 20,000 miles. Across all failure modes on this year, the median report sits at 68,000 miles.

Is the 2009 Infiniti G37 reliable?

It scores 70 out of 100 on our risk index, which is high — 136th riskiest of the 295 2009 vehicles we can rate. The score is a comparison against other 2009 vehicles, not a prediction about any individual car, and it is built from complaint rates, severity and how early failures appear.

Which year of the Infiniti G37 is best?

Within the 2007–2013 generation, 2008 scores best at 64 out of 100 and 2012 worst at 76. Same body, same engines, different luck.

Where this comes from. Every figure above is computed from NHTSA owner complaints and recall records for this exact make, model and year. Complaints are voluntary and self-selected, so treat counts as a floor. The methodology page writes out each formula, and the same numbers are available as JSON.

What breaks at my mileage Compare with another car

Source Owner complaints and recall records published by the US National Highway Traffic Safety Administration, model years 1996–2027 Figures rebuilt 30 August 2026 Published by AtWhatMileage How every figure is computed