Won't run with Scanner plugged in

[KPSquared]

2001 bone stock. Runs well.

As soon as you plug a scanner in, the truck won't start. Plug it in while it's running and it dies. Tried multiple c scanners and an OBDlink dongle.

No codes KOEO

Any thoughts?

 

[Northwoods2002]

I know my truck is sensitive to scanners, mine will do that with cheaper scanners, but work fine with a Snap-On or the like...

 

[DWhite]

I know this isn't the 6.4 section but I had a similar issue with my AE scanner back a few years ago. Once plugged it the truck would do crazy things and blink all the dash lights then die if running. I ended updating the scanner to a newer version.

They told me the problem was something on the can bus communication flipping it out. I've seen cheaper scan tools cause issues and do weird things.

 

[Dieselwrench]

I have seen CAN wires reversed at the diagnostic port from the factory that cause strange things to happen once a diagnostic tool is plugged in. I don't work on Ford's, but it could cause the same problem.

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[Justin@DP-Tuner]

What brand of scanner(s) were you using? As mentioned above, I have seen this occur on many trucks when they are attempting to use a cheap scanner, or an app with the Bluetooth OBDII connector. It happens all the time with the OBS trucks especially.

 

[KPSquared]

Ya, it was my OBCLink MX Bluetooth dongle. . . So maybe that was the problem. Im not sure what other scanners he's had on it.

 

[lilhead1988]

So if you have a good scanner and the problem is still there then could it be in the pcm?




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[Overdrive]

Neither if my trucks worked with cheap scanners. Cheap being the 150 dollar ones. I went with a autenginuity scanner