Hello, I received the P1281 code on my 02 dakota V6. I replaced the t-stat with a 195 temp fail safe, the code returned. I replaced the coolant temp sensor again the code came back. I haven't flushed the system in sometime which I dont think that would could the returning code but... I received info from a mechanic to change the fan clutch. Thanks to this great site; the downloaded Service Manual tells me to check for a free spinning fan. The fan appears to have good drag and at best spins once or twice. At this point, I'm stuck.

 

ECT could have a short somewhere: If its partially or fully grounding out it will send bad info to the pcm making it think that its colder than it actually is.

This happened to me before, and all I did was wiggle the ect pigtail (and the wires to it) around a bit, then seated it firmly back onto the sensor. Problem solved.

Fan clutch could also be to blame, if it is stuck "on" (the viscous fluid conducive to added centrifugal force is stuck at the edges of the disc). It would still spin freely in this situation, so the "spin test" isn't sufficient.


EDIT: Wait, you have an 02? Someone will correct me if i'm wrong, but i believe your truck has an e-fan, which doesnt have a fan clutch at all. There is a relay which could be stuck on, but i believe that would throw another code.

 

What does your gauge on the dash say engine temp is? How does your heater work?

 

i would replace the t-stat again with a Stant Super-stat for about $10-12. i think the fail-safe's are complete garbage.