Is There Any Harm in me Leaving my Bully Dog Tuner/Device Connected to the Vehicle OBDII Port Overnight?

    December 30th, 2021


    Pin 16 on the ODB-II connector is specified as "Battery Power" or "Battery Positive". There will always be 12v power between pin 4 and 16. The connector will always have power on these two pins regardless of the key position, and when you plug a device into the port it will have power and may come on by itself (many scanners/tuners do this).  This can drain some power from the vehicle's battery. 


    Was this article helpful?

    Can’t find what you’re looking for?

    Our Technical Support team is here for you.

    Contact Support