DTC B12F4-12: Vehicle Speed Output - Circuit short to battery: Action

WARNING: This page is about a different car, the 2018 Jaguar XF, 2017 Jaguar XF, and 2016 Jaguar XF. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: This DTC refers to a hardwired speed output from the body control module that can be used for aftermarket/accessory fitting where a pulse-width modulation speed signal is required. The circuit is not used on the standard vehicle, but required for aftermarket fitments.

Refer to the relevant system wiring diagrams and check the accessory road speed signal circuit for short circuit to power