Trailer Towing

WARNING: This page is about a different car, the 2018 Land Rover Discovery Sport. However, it is still accessible from the selected car via links, so may be relevant.

The auto stop/start system will automatically disable when trailer lights are detected by the Central Junction Box (CJB), this information is then transmitted to the Powertrain Control Module (PCM). It is not possible for the system to detect when a trailer power plug is inserted in the vehicle towing connector, so it uses operation of the trailer lights as its indicator.

Towing a trailer inhibits auto stop/start system operation. It is possible that trailer power requirements could interfere with the operation of the battery monitoring system. In particular, a trailer battery could reverse the supply current to the vehicle during an engine cranking event, this could possibly confuse the battery monitoring system into detecting an unrealistically small current at engine cranking.