2011-2015 US Nissan Leaf 3G TCU reliability

This survey will be used to analyse the reliability of Telematics Units in Nissan Leafs that have had their TCUs upgraded to 3G. The TCU is hardware that allows your Leaf to connect to the internet, which lets you check your car’s information from the Nissan EV&Services app or website (previously known as Nissan Connect and CarWings), get emails about the level of your battery, check efficiency and electricity usage, and other data. This hardware is only available on SV and SL trims. If you have ever used the NissanConnect app or website with your Leaf, your car has a TCU.



Prior to the 2016 model year, Leafs were factory-equipped with a 2G TCU. In 2015, AT&T, which provides cellular data service for the Leafs, retired 2G service, which required anyone who wanted to keep using the NissanConnect service to upgrade their units through a dealer. However, these upgraded units have sometimes proven to be unreliable — they “freeze”, making it impossible to access Leaf information through app or NissanConnect website.



Please note that the author of this survey is in no way affiliated with Nissan or any of its affiliates or subsidiaries. I am just a Leaf owner trying to gather data and see if there are any patterns in the behaviour of the upgraded TCU’s.

* Erforderlich