Diesel Diagnostic Equipment

How to Fix Paccar Davie 4 Connection Error

Davie Error

If you or someone you know uses Paccar Davie 4, you may have encountered this frustrating problem before. You plug into your truck, open Davie 4, click “Identify Vehicle”, and eventually end up on this screen.

Davie Error

Why Does This Happen?

This is a common error that more and more technicians are running into nowadays. The #1 reason this happens is because you are connecting to a 2016 or newer engine. The easiest way to explain why is: starting with the 2016 engines, the engineers at Paccar made some changes to the ECMs and how they communicate. Using your standard cables on a 2016 and newer Paccar no longer works.

How to Fix?

As annoying as this error can be, there’s some good news. It is easy to fix. All that is needed to fix this is a CAN Channel Crossover Cable. This additional cable connector plugs into the end of your existing cable and translates data from the 2016 and newer Paccar engines.

CAN Channel Crossover Cable?

There are two main cables on the market that solve this problem.

One is the Paccar Y Adapter. This cable is big and bulky but gets the job done. Unfortunately, with the sudden high demand and COVID supply issues, these have been pretty hard to get. For that reason, we recommend a simpler and more streamlined alternative.

This cable is the Nexiq CAN Channel Crossover Cable. It’s a simpler design and much smaller. It is strongly recommended for any shop that uses the USB Link 2 interface but it can be used with any RP1210 adapter. Unlike the Y adapter, these have not suffered from supply shortage issues as badly.


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