Sudden temperature rise

Over heating the engine is a serious concern. With the hood raised you should hear the motorized fan turn on just behind the radiator as the engine requires additional cooling.. If you look in from the rear of the radiator you should see the fan blades.

This electric powered motor operates on a thermostat and when the engine temperature rises this fan should come on. I'm assuming from your description that when driving and air is flowing through the radiator as the car travels the engine is nor overheating.

Check fan motor thermostat, check fan motor and check wiring.

Wiring Diagrams related to the Honda Civic
http://www.wiringdiagrams21.com/category/automotive/honda-automotive/civic

Motor engine cooling fan only runs as engine temperature requires additional cooling.

I think you have a leaking headgasket or a coolant leak. Have the cooling system pressure tested first, if no external leaks show up then you have a possible leaking headgasket.

check your thermostat , and water pump

engine soon flashing is a urgent code (P0300) it is multiple misfire and the result is converter catalyst could be red and create exhaust leak
I am concern about misfire it is very dangerous for converter and fire in the car or melted carpet
find out the code retrieve

you have to find out why it's overheat ,trans.pipe bent,cooler restrictions,
the pcm know trans.overheat and goes to default mode
have code retrieve

This sounds more like the thermostat is not opening as it should, instead of an ECM problem.

With the indications you state - goes down when heater activated - goes down when moving, that is what I would have checked first, not the cooling fan!

If the vehicle is an manual gearbox, hold the clutch in until the engine has taken properly. If it is a manual rather start i neutral with the park brake on than in Park. Once the engine has started, let it idle for a minute or so before driving off slowly. Until the temperature gauge has at least reached the 1/4 mark, try keep engine revs below about 2500. All the while keep an eye on the temperature gauge, if it rises very sharply and the fan does not come on, there is a possibility that the radiator is frozen and the engine will boil and burst a hose. If the temperature does rise suddenly, stop and carefully feel if the radiator is still cold. If it is, shut off the engine and wait till the radiator has thawed. This will take a while but can be hastened by starting the engine for a few minutes to warm the engine compartment to help thaw the radiator. When water is circulating freely, you should see a sudden drop in temperature. Do not rev the engine too much, the incoming water will be ice cold and could crack something. This is not something that occurs often, especially if you try park the car where air cannot readily blow through the radiator overnight.

yes sir i will be delighted to share my idea with you if your car cease every 15 mile then you should check ignite r component is bad thanks

HAVE YOU HAD THIS CAR CHECKED FOR POSS HEAD GASKET PROBLEM

Sounds like you have transmission fluid in the antifreeze. The transmission cooler might be leaking in the radiator. If it is, replace the radiator.