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Infiniti M56Model year report

2011 Infiniti M56 Problems

Complaints
13filed with NHTSA
Median mileage
75,000miles, 9 complaints with mileage
Recalls
2campaigns on record
Trend
Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA crash rating
4 / 5stars overall, 2 rated versions
EPA fuel economy
19 mpgcombined, 5.6L 8-cyl RWD · 16 city / 25 hwy

Sources: NHTSA records for the 2011 Infiniti M56 (complaints, recalls, investigations), NHTSA crash tests, EPA fuel economy. Report an error

NHTSA recorded 13 consumer complaints for the 2011 Infiniti M56. The part named most often is transmission and drivetrain, with 6 complaints (46% of the total), followed by engine (4) and electrical system (3). 9 of the complaints include a mileage, and 33% of those were filed for vehicles with under 50,000 miles; the median is 75,000 miles. NHTSA lists 2 recall campaigns and 95 technical service bulletins for this model year. Transmission and drivetrain complaints overlap with 2 recall campaigns covering the driveshaft and 4 technical service bulletins filed under the same part. Engine complaints overlap with 7 technical service bulletins filed under the same part.

This model year has fewer than 25 complaints on record, so the numbers below can change a lot with a few new reports.

Which parts are reported most

Complaints can name more than one part, so the counts add up to more than the total. Select a part to see its complaints, recalls and bulletins.

Example complaints

Transmission and drivetrain: “I started the car up and started to drive to work about 3 miles into driving the check engine light came on followed by revs with no power or speed gain and the vehicle was giving me around 15mph to the point where I couldn't gain much more speed and had to pull off the road. There was a voluntary service campaign for the timing chain but it has since expired and now I am stuck with the repairs.”

NHTSA complaint #11181548, filed 2019-02, 84,000 miles

Engine: “My solenoid switch went bad on me and needed to be replaced, took it to the Infiniti dealership and they corrected the problem so I thought until oct 13 when I kept hearing this noise coming from my hook like a squealing noise.. Took it back to the dealership and found out it was the timing chain, which I was told had nothing to do with the solenoid switch that was previously fixed.. …”

NHTSA complaint #10645053, filed 2014-10, 87,000 miles

Electrical system: “The contact owns a 2011 Infiniti m56x. The contact stated the vehicle failed to start. The contact was able to start the vehicle. However, shortly after the battery died, the lights failed and the vehicle automatically locked, leaving the contact trapped in the vehicle. The vehicle was taken to a dealer. The technician was unable to diagnose the failure. The vehicle was not repaired. The manufacturer was made aware of the failure. The failure and current mileage was 27,000.”

NHTSA complaint #10597944, filed 2014-06, 27,000 miles

Air bags: “Front passenger airbag occupancy sensor fails leading to inactivation of front passenger airbag. Dealership says that a repair solution is not available.”

NHTSA complaint #11543567, filed 2023-09

Mileage when problems were reported

33% of the 9 complaints with a mileage were filed for vehicles with under 50,000 miles; the middle half falls between 38,520 and 87,000 miles.

0%0–100%10–2533%25–5011%50–7544%75–10011%100–1500%150+
Share of complaints by mileage when the problem was reported, in thousands of miles (9 complaints with mileage). Red bars: under 50,000 miles. Bucket widths differ. Median: 75,000 miles.

Complaints by year filed

Fewer than 15 complaints, too few for a reliable trend.

201432015201720182019202132023
Complaints by year the complaint was filed with NHTSA. Red bars: the last 3 full calendar years used for the trend. The current year (2026) is partial.

Crash test ratings

NHTSA's 5-Star Safety Ratings for the 2011 Infiniti M56. Frontal results are shown driver / passenger; rollover shows the star rating and NHTSA's estimated risk of rolling over in a single-vehicle crash.

VersionOverallFrontalSideSide poleRollover
M56 · sedan AWD★★★★☆5 / 3554 · 11.3% risk
M56 · sedan RWD★★★★☆5 / 3554 · 11.3% risk

Driver aids listed by NHTSA for the 2011 model year: forward collision warning optional, lane departure warning optional, automatic emergency braking not available.

Neighbouring years: 2012: same overall rating. A redesign between years can change both the car and the test.

Source: NHTSA New Car Assessment Program (5-Star Safety Ratings), nhtsa.gov/ratings.

Fuel economy and running cost

EPA ratings for each 2011 Infiniti M56 version. Annual fuel cost is the EPA's estimate at its current fuel prices for 15,000 miles a year (55% city driving).

VersionEngineTransmissionCityHwyComb.Fuel / yr
M56 RWD5.6L 8-cyl7-speed automatic162519$4,350
M56x AWD5.6L 8-cyl7-speed automatic162318$4,550

Source: U.S. EPA and Department of Energy, fueleconomy.gov. Ratings are for comparing vehicles; real-world mileage varies with driving and conditions.

Recalls and investigations

Recall details for the 2011 Infiniti M56 → · Check a VIN at nhtsa.gov/recalls

Technical service bulletins

TSBs are manufacturer notes to dealers about known repair procedures. They are not recalls and do not by themselves mean a vehicle has a fault. 95 on record; the latest 10 are shown.

See all 95 bulletins →

Other model years of the Infiniti M56

YearComplaintsMedian miRecallsCrash ★MPGScore (50 = typical)Trend
20111375,0002419—Not enough data

All Infiniti M56 model years

Frequently asked questions

How many NHTSA complaints does the 2011 Infiniti M56 have?

NHTSA recorded 13 consumer complaints for the 2011 Infiniti M56 as of Oct 29, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.

What part of the 2011 Infiniti M56 is reported most often?

Transmission and drivetrain is named most often, in 6 complaints (46% of the total), followed by engine with 4.

Has the 2011 Infiniti M56 been recalled?

NHTSA lists 2 recall campaigns for this model year. To check a specific vehicle, enter its VIN at nhtsa.gov/recalls.

How did the 2011 Infiniti M56 do in NHTSA crash tests?

NHTSA's 5-Star Safety Ratings give the 2011 Infiniti M56 4 out of 5 stars overall, across 2 rated versions (body style and drive). Ratings from different model years are only comparable when the vehicle was not redesigned in between.

What gas mileage does the 2011 Infiniti M56 get?

The EPA rates the 2011 Infiniti M56 (M56, 5.6L 8-cyl) at 19 mpg combined, 16 city and 25 highway, with an estimated annual fuel cost of $4,350 at 15,000 miles a year. Other engine and drive versions are rated differently.

At what mileage are problems with the 2011 Infiniti M56 reported?

Among the 9 complaints that include a mileage, the median is 75,000 miles and the middle half falls between 38,520 and 87,000 miles; 33% were filed for vehicles with under 50,000 miles.

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 29, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate. Crash ratings are from NHTSA’s New Car Assessment Program. Fuel economy is from the EPA and DOE (fueleconomy.gov).

Complaint counts come from NHTSA’s public complaint database; we count each complaint once. The source records for this vehicle are on nhtsa.gov. Scores and trends are our own summaries of that data, described in the methodology. This page is not legal, safety or repair advice: for a specific vehicle, check its VIN at nhtsa.gov/recalls and ask a qualified mechanic. See an error? Tell us.