Emergency Power
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.
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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 come on and stay on.
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Different lamps on both or one side of the vehicle start flashing.
No matter the cause, the following lamps activate and remain on:
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headlamps, low beams (either the left, right, or both)
No matter the cause, the following lamps flash:
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front turn signals, left and right