Cadillac CT6 SEDAN This vehicle is equipped with an electronic shift lock release system. The shift lock release is designed to prevent movement of the shift lever out of P (Park), unless the ignition is in ON/RUN and the brake pedal is applied.
The shift lock release is always functional except in the case of an uncharged or low voltage (less than 9 volt) battery. If the vehicle has an uncharged battery or a battery with low voltage, try charging or jump starting the battery.
Sport Mode
Sport Mode provides more responsive acceleration than Tour Mode, but can reduce efficiency. Use Tour Mode whenever possible. During some conditions, certain drive modes may be unavailable. The unavailable mode is grayed out in the DIC menu and cannot be selected. If in Sport or Hold Mode, the mode may become unavailable and the vehicle will return to Tour Mode. The indicator light goes off and a DIC message displays. Press MODE to select Sport Mode. Press MODE again to return to Tour Mode and it becomes active after three seconds.
Hold Mode
Use Hold Mode on a trip where it is expected that all of the electric charge will be depleted. Use Hold Mode mainly during highway or high speed driving to maximize both hybrid propulsion miles and fuel efficiency. This mode places the remaining battery charge into a reserve for the driver to use as desired. Selecting this mode transitions the vehicle to gasoline propulsion to maintain the battery charge reserve. The reserve battery charge will appear grayed out while in this mode. Upon exiting Hold Mode, the reserved battery charge becomes available again and the vehicle returns to hybrid propulsion. Hold Mode will not change normal vehicle acceleration or braking performance.
Out of Fuel/Engine Unavailable
If the vehicle runs out of fuel, or the engine will not start due to a malfunction, the vehicle can continue to be driven in Electric Mode until the current charge is depleted. The vehicle will have less responsive acceleration. DIC messages indicate reduced propulsion power, that the engine is not available, and the need for fuel or service.
Once the vehicle is refueled, or the malfunction is corrected, the engine will start the next time the vehicle is turned on to perform a self test, and DIC messages will not be displayed. Once the engine starts successfully, normal operation will continue in either Electric or Engine On Mode. The engine will stop running after the self test is completed, and based on the current mode of operation.
Maintenance Modes
Engine Maintenance Mode (EMM) EMM runs the engine to keep it in good working condition after approximately six weeks of no or very limited engine operation. EMM will force the engine to run, even if there is a charge to power the vehicle.
When EMM is needed, the EMM
Request screen appears on the infotainment display at vehicle start. If Yes is selected, EMM will begin. The engine will not start until after a short delay once shifted into D (Drive). The engine will run for a set amount of time without turning off. During EMM, a DIC message displays to show the EMM percentage complete.
If No is selected, the EMM Request screen will appear when the vehicle is next started. The EMM request can be delayed for up to one day. If the EMM request was delayed for one day, EMM will automatically start the engine at the next vehicle start. The engine will not start until after a short delay once shifted into D (Drive).
Fuel Maintenance Mode (FMM)
FMM tracks average fuel age. Old fuel can cause engine problems. If low engine usage causes average fuel age to exceed approximately one year, FMM will run the engine to use up the old fuel. The engine will run until enough fresh fuel is added to bring the average fuel age into an acceptable range. Allowing more old fuel to be used up by FMM and adding a larger amount of fresh fuel will maximize the length of time before another fuel maintenance mode is needed. During FMM the engine may turn on and off.
When FMM is needed, the FMM Request screen appears on the infotainment display at vehicle start. If Yes is selected, FMM will begin. The engine will not start until after a short delay once shifted into D (Drive). FMM will automatically continue at each vehicle start until fresh fuel is added. If No is selected, the FMM Request screen will appear when the vehicle is next started. The FMM request can be delayed for only one day.