The flaw could also lead to increased noise or a differential fluid leak.

Maserati will recall 326 examples of the 2017 Ghibli and 2017 Quattroporte in the United States for a problem that could cause the rear wheels to lock up. Specifically, this issue affects vehicles with production dates from July 1, 2016, to October 12, 2016.

The rear differential pinion nut might not be properly tightened on these vehicles. If it is loose, the pinion gear could bind and lock the wheels. Customers might also notice increased noise, vibration, and harshness in the cabin, and another symptom of the issue is a differential fluid leak at the pinion seal.

Maserati first noticed this issue on September 1, 2016, when workers at the factory in Grugliasco, Italy, noticed increased rear differential noise on two vehicles during pre-delivery testing. The company shipped the components back to its supplier, GKN, in the United States, and that firm started inspecting the defective parts. The investigation showed incorrect torque on both the pinion flange nuts during assembly at GKN’s factory. The business identified a batch of 948 examples of the faulty assemblies that went to Maserati. The Italian automaker placed a stop delivery on the models. The firm found six of them in the factory yard and 942 shipped to dealers, which included the 326 already estimated on the road with customers.

To fix the problem, dealers will check the torque on the rear differential unit pinion nut and will replace the entire assembly if necessary. Maserati will mail affected customers within the next 30 days.

Maserati recalled 13,092 units of the 2014 Quattroporte and Ghibli earlier this year because of potential driver confusion over the action of the vehicles’ eight-speed automatic transmission shifter. The company had concerns about customers not being able to identify if the models were in Park because the gearshift didn’t physically move to a new location when moving through the gears. The automaker has been developing a software update to remedy the issue.

Source: National Highway Traffic Safety Administration

2017 Maserati Quattroporte

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RECALL Subject : Rear Differential Pinion Nut Improperly Torqued
Report Receipt Date: NOV 28, 2016
NHTSA Campaign Number: 16V856000
Component(s): POWER TRAIN
Potential Number of Units Affected: 326

All Products Associated with this Recall

Vehicle Make Model Model Year(s)
MASERATI GHIBLI 2017

MASERATI QUATTROPORTE 2017

Details 
Manufacturer: Maserati North America, Inc.

SUMMARY:
Maserati North America, Inc. (Maserati) is recalling certain model year 2017 Quattroporte and Ghibli vehicles manufactured July 1, 2016, to October 12, 2016. The rear differential unit pinion nut may not have been properly tightened, allowing the pinion nut to loosen.

CONSEQUENCE:
A loose pinion gear may bind, possibly resulting in the rear wheels locking up and increasing the risk of a crash.

REMEDY:
Maserati will notify owners, and dealers will inspect the rear differential unit pinion nut torque, and, as necessary, replace the rear differential unit, free of charge. The recall is expected to begin in December 2016. Owners may contact Maserati customer service at 1-201-510-2369. Maserati's number for this recall is 328.

NOTES:
Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.safercar.gov.