engine light on? no tools? no problem! how to use the key & vehicle itself as a diagnostic OBD2 scanner to diagnose itself lol / learn how and why the service lights CEL check engine light is on. easy and free . no special tools needed to scan the ECU ECM CPU and read the P-codes at home and do it yourself. works on dodge , plymouth , mopar vehicles around 99+ up , and possibly current models also ? should work on jeep models as well. demonstrated on a 2001 chrysler pt cruiser and a 2000 dodge dakota.
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Good hack. That trick works on the newer ones too. Not sure if it works on all of them, but I did it last week on a 2015 Ram and it worked.