DTC C1137: Reverse Gear Switch: Action
WARNING: This page is about a different car, the 2020 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
This DTC sets when the when the reverse gear message sent from the GSM indicates the transmission is in REVERSE when other stability control inputs received by the ABS module indicate the vehicle is moving forward. RETRIEVE and REPAIR all non-network DTCs in the GSM. REFER to the Automatic Transmission External Controls article.