2002 F-150 w/ 5.4 tossed code P1025

[Dragonsm]

I really am having great luck this week. The corsica is back together again and running great just in time for my truck to toss a code.

2002 F-150 with the 5.4 (70,000 miles with probably what is the original t-stat)

had the code read the other night and it was a P1025

-Insufficient Coolant Temperature to enter Closed Loop

Guess temp/coolant work was so much fun on the corsica that I'll be doing it again.

My first instict was to check the coolant level which it seems fine.

Next thought I am thinking is to change out the thermostat. Right now the temp gauge reads real low and the heater does not cook you out of the cabin. Another stuck open T-stat?

and if that doesn't work, I have been reading online about a Cylinder Head Temp Sensor which will be the third plan of attack?

What do all the pros out there think and am I on the right path?

Thanks,

Steve

(maybe I should study up on Pontiac Vibes (wife's car) for next week the way my luck is going)

[Jeremy airjer W]

This code is almost always taken care of with a new t-stat. The one in the truck is either stuck open or broken.

[Shack]

Another stuck open T-stat?

and if that doesn't work, I have been reading online about a Cylinder Head Temp Sensor which will be the third plan of attack?

That is what I would be doing, with the info that was given.

Good luck!

[Scott K]

T-tsat should take care of this one!