Originally Posted by Alan
For shits and grins I decided to run the DTC code feature on my Xcal2. "B1681" popped up on the screen. This is what I've found:
The car runs/starts find, leading me to believe I don't have an issue with the PATS system. No check engine light either. Any ideas what may be wrong?
Here's what I found on it,
B1681: PATS transceiver module signal is not received by the PCM. This code can be caused by circuits between PATS transceiver and PCM, PATS transceiver, or possibly the PCM.
Here's the link with the trouble shooting instructions.
http://www.v8sho.com/SHO/Passive%20A...%2099-26-6.htm
It sounds like it could be the pcm. If its not causing a problem I would leave it alone.