Emergency Power
Note: Emergency power mode is not available on vehicles built from September 2021 to the present.
New Cascadia vehicles with CEEA+ architecture built before September 2021 may not exhibit the behaviors listed below when the emergency power circuit is active.
Warning: If emergency power is activated, do not shut down the engine until the vehicle is out of traffic and in a safe place. The engine will not be able to be restarted until the cause of the loss of power is corrected.
The emergency power circuit, formerly called 'Limp Home Mode,' allows a vehicle to be moved out of traffic and off the road in the event of a loss of power.
The emergency power circuit is live even when the cab load disconnect switch (CLDS) is turned off.
When the emergency power circuit is active, the vehicle will display varying behaviors depending on the cause of the loss of power:
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Windshield wipers may activate in vehicles built in or after 2018.
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Windshield wipers may activate in vehicles built before 2018 if the sSAM module and/or software has been upgraded.
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Gauges may become unresponsive or freeze.
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Switches may become inoperative.
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Warning lamps may display indicating low voltage and/or ECU faults.
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Different lamps on both or one side of the vehicle will come on and stay on.
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Different lamps on both or one side of the vehicle will start flashing.
Causes and their specific symptoms are detailed in the New Cascadia Electrical Systems and Troubleshooting Manual.
No matter the cause, the following lamps will remain constantly on:
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headlamps, low beams (either the left, right, or both)
No matter the cause, the following lamps will flash:
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front turn signals, left and right
Turning the ignition switch to OFF when in emergency power mode shuts down the exterior lighting, windshield wipers, and the engine. The engine will not start if the ignition switch is turned back to the ON position.