The OBD-2 has detected a malfunction, but the scan tool can't get a reading. What may cause this?
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2004 Ford Taurus Question: No reading from the OBD-2
Answer #1mastertech6371 January 18, 2011, 16:45Master
I assume your light is on.
if there is no power to the scan tool, there is a fuse that provides power to the obdII connector. it is usually the cigar lighter fuse.
if it does have power and cannot communicate then there is a module that is pulling the system to ground and must be diaged by a shop.
Replybean01, January 20, 2011, 21:51Rookie
Thanks Roy. As you said the fuse to the cigar lighter was out and after replacing it, I was able to get a reading.