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I have two ODB readers and neither can communicate with my 2006 Grand Caravan. They will power up. They will communicate in other vehicles. They both attempt to try a list of communication protocols but fail. I can retrieve DTC via the ignition method (cycle key 3 times)

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I have two ODB readers and neither can communicate with my 2006 Grand Caravan. They will power up. They will communicate in other vehicles. They both attempt to try a list of communication protocols but fail. I can retrieve DTC via the ignition method (cycle key 3 times)

View attachment 59404

View attachment 59403
Check the cigarette lighter fuze

Mike S Grand caravan 3.3
 

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I have two ODB readers and neither can communicate with my 2006 Grand Caravan. They will power up. They will communicate in other vehicles. They both attempt to try a list of communication protocols but fail. I can retrieve DTC via the ignition method (cycle key 3 times)
Our vans need OBD-2 readers. The very old OBD readers will not work.

If those are OBD-2, try this, turn the key forward without starting the engine. Then plug in the OBD-2 readers to pull codes.

If your readers will work in other vehicles, then the van's ECM/PCM module could be going bad.
 

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These are ODB2 scanners as pictured. Since they are powered, likely not a fuse; fuses all look good upon inspection. As stated from the start, these scanners work in my other car. I tried a third ODB2 scanner and it also won't talk. I towed this van to my Chrysler tech's home shop and his scan tool works! He'll troubleshoot further. Next time, I'll be more intentional about the ignition position, but I swear I tried in all positions. I can try this again when I get the van back.
 
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