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+--- Thread: Insite + Nexiq on My '99 and '01 Dodge – What's Going Wrong? (/showthread.php?tid=17111)
Insite + Nexiq on My '99 and '01 Dodge – What's Going Wrong? - Martin56 - 05-29-2025
I’ve got access to Caterpillar, Detroit, Volvo, and Cummins diagnostic software at work, and we use the nexiq 2 usb link across all of them without any issues.
I recently purchased a Nexiq adapter to use with my personal Dodge/Cummins trucks. The setup I’m working with:
1999 Dodge: Has the triangular 3-pin connector near the ECM.
2001 Dodge: Has the flat 3-pin connector, also near the ECM.
The Nexiq adapter I bought only includes the triangular 3-pin connector — not the flat 3-pin that my 2001 harness uses.
Issue
I tried connecting to the ECM on my 1999 Dodge using the triangular 3-pin connector, but it wouldn’t work. In fact, it triggered a Check Engine Light with a communication code error. I was able to clear that code using another tool I have.
I also tried plugging into the datalink port where my Quadzilla tuner is connected, still no luck.
I noticed that the 3-pin triangular connector on the truck only has two wires populated.
What Am I Doing Wrong?
Why can’t I communicate with the ECM? Is the missing wire the issue? Do I need a different adapter for full compatibility with these older Dodge trucks?
Any help would be appreciated from those who’ve had success reading the ECM on a '99 or '01 Dodge using Insite and Nexiq.