Trailer Towing

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The auto stop/start system will automatically disable when trailer lights are detected by the Deployable Towbar Control Module (DTCM). The DTCM sends a message to the Body Control Module/Gateway Module (BCM/GWM) assembly via High Speed (HS) Controller Area Network (CAN) body systems bus when trailer lights are detected. This information is then transmitted to the Powertrain Control Module (PCM) via the FlexRay bus to disable the auto stop/start system.

The trailer towing system inhibits auto stop/start operation as it is possible that trailer power requirements could interfere with the operation of the Battery Monitoring System (BMS). In particular, a trailer battery could reverse the feed current to the vehicle during an engine cranking event. This could possibly confuse the BMS into detecting an unrealistically small current at engine cranking.