For those working on 2018 and newer vehicles, particularly CDJR (Chrysler, Dodge, Jeep, Ram) models, you might have encountered a frustrating limitation with your trusty car scanner. Many users, even those with updated professional tools, find themselves unable to fully diagnose or command these newer vehicles in the same way they could with older models. This is often due to the introduction of the Secure Gateway Module (SGW).
Starting in 2018, CDJR implemented SGW to enhance vehicle security. This module effectively puts a gatekeeper in your car’s network, restricting access via the OBD II port to read-only for aftermarket scan tools in many functions. While you can often still view live data and run basic diagnostics, tasks like clearing codes or programming new modules become impossible without bypassing this security.
There are a couple of primary methods to overcome this SGW restriction. One is to obtain a subscription to the manufacturer’s diagnostic software. This grants you the necessary authentication to communicate bi-directionally with the vehicle’s modules. Alternatively, a more hands-on approach involves using a bypass cable, such as a 12+8 adapter. This cable physically circumvents the SGW, allowing your scanner to directly interface with the vehicle’s systems.
The location of the SGW varies by model, often found behind the instrument cluster or radio. Resources like this comprehensive list provide detailed locations for various CDJR vehicles. Navigating the SGW is crucial for effective diagnostics on 2018 and newer cars. Choosing the “best scanner for cars 2018” now also means considering its ability to work with or bypass these security measures for full functionality.
