strange thing happened to a truck i was driving

my normal truck, truck 84 developed a pin hole leak in a tire. i got back to the shop and a mechanic was on duty (not usually on a sunday but he was there). so i left my truck for him to plug the tire and i took truck 73. its an older T800 sleeper with a strong running cat. i drove all day, upon return to the yard, the check engine light, engine STOP light (flashing), and low coolant lights were all on. engine sounded normal, oil pressure and oil/coolant temp gauges all normal. i opened the hood and checked the coolant level, also appeared full (i didnt open the cap, hot engine). does anyone have any idea what happened? my guess would be a coolant level sensor failed, and it thought it was empty of coolant.

strange to see that behavior when all of the gauges were normal.

 

i did that. i wonder what the mechanic will find. i would guess a bad sensor since everything was reading normal. engine temp was 180-200

 

i was actually surprised how strong that truck was running. under full throttle she had 50 psi of boost. most trucks i have driven max out at 40 psi. that truck pulls hard. truck also rode nice for 620K miles. that truck pulls allot better then the supposedly 500 hp paccar engine in truck 84. truck 84 is a nice truck but it seems to be just adequate in the power dept. if it were up to me, and i was the person responsible for purchasing trucks, i would be buying fritzgerld T800 glider kits with C15's, over the T880 with the paccar engine. the paccar engine also takes some getting used to as far as shifting goes also. it revs up allot faster then a cat and has a touchy fuel pedal. let off the fuel some get it out of gear, light touch on the throttle to bring revs up and downshift..... and i mean a light touch.