Zero hours came up on my display for no apparent reason and my truck shut down.

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What does zero hours mean? Is that why my truck won't start? All fluids are full at the time.was only driven 10 miles per hour .was no warning lights telling me of any problems. Took my truck for regular schegdual maintainance and they power washed my engine and causing electrical problems. So had to keep my truck for two days and tried to fix it.720 481 5694 michelle